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BoP Lab / Rules / SRF3

SRF3: rule changes

In our results from 2015-09-19 to 2026-09-28.

Wording removed by a change is shown struck through, as in the original. 38 changes, 10 other letters.

Changes made

SRF3 Spark Plugs

#39899 from Robey Clark · Rule change · TB 26-03 (2026-03 Fastrack)

In SRF, GCR section 9.1.8.D.2.H.18, add the following:
"Spark Plugs: P/N G301041 ONLY NGK LTR7IX-11 / Washers or sealing rings are not allowed for any purpose."

Add HD Oil Cooler

#38979 from Robey Clark · Rule change · TB 25-10 (2025-10 Fastrack)

In SRF, GCR section 9.1.8.D.1.V.ff, change as follows:
"SRF3 Oil Cooler, P/N G480503 or HD Oil Cooler P/N G1148500 may be used as mounted per the GEN3 Assembly Manual. No fan
permitted for SRF. HD Oil Cooler kit P/N G1148500 may be used as mounted per the GEN3 Conversion Manual."

SRF Rule Updates

#38853 from Robey Clark · Rule change · TB 25-09 (2025-09 Fastrack)

Effective 9/1/25 in SRF, GCR section 9.1.8.D.1.V.ff, add the following:
"SRF3 Oil Cooler, P/N G480503 may be used as mounted per the GEN3 Assembly Manual. No fan permitted for SRF. HD Oil
Cooler kit P/N G1148500 may be used as mounted per the GEN3 Conversion Manual."
Effective 9/1/25 in SRF, GCR section 9.1.8.D.X.g, change as follows:
"Brakes: Hawk Blue 9012 pads P/N 801993 must be used. Wilwood vented rotor P/N 800065 must be used as delivered with no
machining of any kind. Minimum thickness 13.25mm (0.522”). The Renault Alliance solid front rotors may not be used. Rubber
caliper bushings may be replaced with bronze bushings P/N 1196185 or P/N 1196185. Original caliper pistons may be replaced
with vented caliper piston P/N 1196184; no other modification allowed. Wilwood caliper with bracket universal fit P/N 800038

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may be used as delivered with no modification of any kind. Wilwood knock back spring (2.63 lbs.) P/N 800045 may be used as
delivered with no modification of any kind; maximum of one spring per caliper.
1. Hawk Blue pads P/N 801993 only
2. Wilwood Vented Rotor P/N 800065 only, as delivered, with no machining of any kind. Minimum thickness 13.25mm (0.522")
3. Wilwood universal caliper Kit P/N 1180008 as delivered, caliper only P/N 800038; Wilwood knock back spring P/N 800045
may be used as delivered, with no machining of any kind, and only one spring per caliper
4. Renault caliper rubber bushings may be replaced with bronze bushings P/N 1196185 or P/N 1196185A
5. Renault caliper piston may be replaced with P/N 1196184 vented piston as delivered, with no machining of any kind
6. Girling .750" Master Cylinder P/N 880358 as delivered, with no machining of any kind
7. Wilwood .750" Master Cylinder P/N 880357 as delivered, with no machining of any kind
8. Tilton .750" Master Cylinder P/N 880360 as delivered, with no machining of any kind"

Driver Safety & Comfort

#37966 from Robey Clark · Rule change · TB 25-04 (2025-04 Fastrack)

In SRF, GCR section 9.1.8.D.1.D, add the following:
"f. Driver Safety and Comfort modifications to seat and controls for drivers with disabilities may be made only by approval. These
modifications must be reported to SCCA Enterprises and noted in the car logbook. The modifications are approved only for the
noted driver with disabilities. If the car is used by or sold to another driver, it must be returned to the previous standard
configuration."

Update SADEV transmission specs

#37992 from Club Racing Board · Rule change · TB 25-04 (2025-04 Fastrack)

In SRF, GCR section 9.1.8.D.2.K, change as follows:
"OR
SADEV-SRF3 6-Speed Sequential (beginning from Oct. 4, 2021 onward):
1st 12-36 3.0000 : 1
2nd 15-31 2.0667 : 1
3rd 18-28 1.5556 : 1
4th 22-28 1.2727 : 1
5th 24-26 1.0833 : 1

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6th 25-23 0.9200 : 1
Final Drive Ratio: 15-48 3.20"

Update SRF3 Air Filter Rule

#36681 from Robey Clark · Rule change · TB 24-10 (2024-10 Fastrack)

In SRF, GCR section 9.1.8.D.2.H.23, change as follows:
"Air Filter: P/N WM301020 or K&N RC-9160"

Update SRF Brake Rotor Thickness

#36687 from Robey Clark · Rule change · TB 24-10 (2024-10 Fastrack)

In SRF, GCR section 9.1.8.D.1.X.g, change as follows:
"Brakes: Hawk Blue 9012 pads P/N 801993 must be used. Wilwood vented rotor P/N 800065 shall must be used as delivered with
no machining of any kind. Minimum thickness 12.20mm (0.481”) 13.25mm (0.522”)."

Hoosier Tire Decal Placement

#36739 from Robey Clark · Rule change · TB 24-10 (2024-10 Fastrack)

In SRF, GCR section 9.1.8.D.2.B, change as follows:
"Mandatory identification: "SRF3" near the side car numbers. "Hoosier" logo (4) on both sides front lower outer corners of the
nose and each side of the tail. Three (3) "Hoosier" logos, one (1) on each side of the car and one (1) on the center front of the car."

Update to Letter 36619 with new Hoosier Contingency Decal Info

#36624 from Robey Clark · Rule change · TB 24-09 (2024-09 Fastrack)

In SRF, GCR section 9.1.8.D.1.X.f.3, change as follows:
"Four (4) "Hoosier" decals are required in the following locations: Two (2) 11" X 3" decals on the vertical plane of the front nose
to the outside of the cooling opening on each side and two (2) 18" X 5" decals, one on each side of the engine cover or above the
rear wheel openings on the vertical plane. Hoosier decals are available, free of charge, from all Hoosier tire distributors including
SCCA Enterprises Per Hoosier's contingency program, three (3) decals are required to qualify for contingency awards. One (1)
decal must be located on each side of the car and one (1) decal must be visible on the front."

Update Rain Tire Rule and Hoosier Decal Placement

#36436 from Robey Clark · Rule change · TB 24-08 (2024-08 Fastrack)

In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Wet:
Front – Hoosier P/N 46100 P185/60R13 H20 or W2
Rear – Hoosier P/N 46105 P205/60R13 H20 or W2
Ground clearance is 2.5” with driver as raced when P185/60R13 (H20 or W2) tires are used.
OR
Front – Hoosier P/N 46101 P185/65R13 W2
Rear – Hoosier P/N 46105 P205/60R13 W2

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1. It is forbidden to regroove tires.
2. The use of tire warmers or cooling methods other than natural air convection or conduction is prohibited. The penalty for
violation will be the loss of qualifying times and/or the disqualification of race results.
3. Hoosier SRF/SRF3 Decal Placement:
Four (4) "Hoosier" decals are required in the following locations: Two (2) 11" X 3" decals on the vertical plane of the front nose to
the outside of the cooling opening on each side and two (2) 18" X 5" decals, one on each side of the engine cover or above the
rear wheel openings on the vertical plane. Hoosier decals are available, free of charge, from all Hoosier tire distributors including
SCCA Enterprises."

SRF3 Alternator Pulley Update In

#36095 from Robey Clark · Rule change · TB 24-06 (2024-06 Fastrack)

SFR3, GCR section 9.1.8.D.2.H.17, change as follows:
"Alternator Pulley: P/N G902130, or P/N G902130A, or P/N G902131 (six row). 12 11 oz minimum weight."

Update SRF Rain / Brake Rule

#34706 from Robey Clark · Rule change · TB 23-09 (2023-09 Fastrack)

In SRF, GCR section 9.1.8.D.1.W.l, change as follows:
"A Super Bright LEDs Inc. rain / brake light comprised of a single standard trailer oval lamp, 2-1/4 inches x 6-1/2 inches, with
incandescent or LED illumination, P/N PT-STRB-R24, is required in the original roll hoop mounting location. This rule supersedes
GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024. No changes may be made to the original 3-pin connector on the
wiring harness. The secondary filament of the brake light assembly shall must be connected to a switch enabling its use as a rain
light."

Update SRF Brake Light Rule v1

#34853 from Robey Clark · Rule change · TB 23-10 (2023-10 Fastrack)

In SRF, GCR section 9.1.8.D.1.W.l, change as follows:
"A Super Bright LEDs Inc. P/N PT-STRB-R24 (SCCA Enterprises P/N 180427A) rain / brake light, P/N PT-STRB-R24, is required in the
original roll hoop mounting location. This rule supersedes GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024. No
changes may be made to the original 3-pin connector on the wiring harness. An SCCA Enterprises P/N 1190503 Strobing Brake
Light Pigtail is required. The secondary filament of the brake light assembly must be connected to a switch enabling its use as
a strobing rain light. A Strobing Brake Light Kit P/N 1168003 is available, which includes the brake light and pigtail."

SRF / SRF3 Rule Updates

#35268 from Robey Clark · Rule change · TB 24-01 (2024-01 Fastrack)

In SRF, GCR section 9.1.8.D.1.H, add the following:
"NO MODIFICATIONS ALLOWED. Front brake ducts are required, attached to the openings in the lower radiator baffles, any
flexible 4" duct material allowed, installed length minimum 12" maximum 36" in length. Must be securely fastened, Bracket Part
# P/N 800368 can be used. Shall Must serve no other purpose. An extension may be welded to the side of the throttle pedal to
improve heel-and-toe braking. Master cylinder casting / location must be used as delivered on P/N 180110 Pedal Mounting
support. Aeroquip style -3 braided stainless flex lines only, must attach to all brake components without modification. Brake pad
"anti-rattle" clips must be removed."
In SRF, GCR section 9.1.8.D.1.V, add the following:

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"ii. Rear SADEV shift cable aluminum two-piece style clamp may be used. The P/N WM302007A clamp must serve no other
purpose."
In SRF, GCR section 9.1.8.D.1.X.k, add the following:
"Negative camber shall must not exceed 5.0 degrees absolute maximum front and rear."
In SRF, GCR section 9.1.8.D.1.AA.b, add the following:
"2. Height of the radiator opening vertical surface 3 1/2“ +/- 1/2"."
P2 Engine Table B.1
2008 and older Stock
Suzuki, Yamaha,
Honda, BMW
38.5mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 38.5mm
Modified
Engine
950 lbs.
1005cc max
P2 Engine Table B.1
2008 and older 37mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 39mm
Stock Engine
1050 lbs.

SRF Radiator Rule Update

#34805 from Robey Clark · Rule change · TB 23-10 (2023-10 Fastrack)

In SRF, GCR section 9.1.8.D.1.V.j, change as follows:
"Radiator - Enterprises new style P/N 480465 (requires baffle P/N 480464) or P/N 480466 can be used. P/N 480466, may can be
replaced with Automotive P/N 1R698, CU698 or equivalent OEM manufacturer justified by one cross-reference chart equivalent,
as long as the size, shape, and material are the same as the original P/N. The capacity, core thickness, etc., cannot be changed
even if allowed under the above. The competitor is responsible for providing this documentation of the cross-reference P/N."

Hoosier SRF Wet Front Tire Rule Update

#34189 from Robey Clark · Rule change · TB 23-06 (2023-06 Fastrack)

In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Wet:
Front – Hoosier P/N 46100 P185/60R13 H20 or W2
Rear – Hoosier P/N 46105 P205/60R13 H20 or W2
Ground clearance is 2.5" with driver as raced when P185/60R13 (H20 or W2) tires are used."

Update SRF Front W2 Rain Tire Part Number

#34118 from Robey Clark · Rule change · TB 23-05 (2023-05 Fastrack)

In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Front – Hoosier P/N 46100 1 P185/65R13 W2"

Update SRF Brake Rule

#33469 from Robey Clark · Rule change · TB 23-01 (2023-01 Fastrack)

In SRF, GCR section 9.1.8.D.X.g, change as follows:
"Brakes: Hawk Blue 9012 pads P/N 801993 must be used. Wilwood vented rotor P/N 800065 shall be used as delivered with no
machining of any kind. Minimum thickness 12.20mm (0.481"). The 1985 Renault Alliance solid front rotor (Reference: Bendix
PRT1318 or Centrix 121.11004) may be used on front, rear, or both axles, but each axle must be paired to the same type
rotor. The Renault Alliance solid front rotors may not be used. Rubber caliper bushings may be replaced with bronze bushings P/N
1196185 or P/N 1196185. Original caliper pistons may be replaced with vented caliper piston P/N 1196184; no other
modification allowed. Wilwood caliper with bracket universal fit P/N 800038 may be used as delivered with no modification of
any kind. Wilwood knock back spring (2.63 lbs.) P/N 800045 may be used as delivered with no modification of any kind;

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maximum of one spring per caliper."
P2 Engine Table
Spec
Line Engine Series

A specification table follows in the original; it is not shown here.

Update SRF Bodywork Fitment Rule

#33765 from Robey Clark · Rule change · TB 23-03 (2023-03 Fastrack)

In Spec Racer Ford, GCR section 9.1.8.D.1.E, change as follows:
"j. Optional Bodywork Modification:
Viewing the tail section of the car from behind, draw a vertical line at the left and right ends of the outer vents from the bottom
edge of the bodywork up to a point two (2) inches below the crease at the lower edge of the vented panel. Make a vertical cut at
each line. The horizontal cut is to be one (1) inch below the crease at the base of the vented panel. Leave a one (1) inch radius at
each corner. Air Scoop (P/N 190000) must be installed in conjunction with rear cutout per Enterprises installation instructions.
SRF3 tail sections are allowed on SRFs. For purposes of tail section to center section fitment with the GEN3 airbox, shimming is
allowed at the rear of the center section. Shim material may be up to 19 mm (0.75") thick along the 1" upper square sidepod

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tube. Mounting location cannot be modified or added. Shim material must be securely attached, but must not be welded.
An alternate dash panel has been approved for use in Spec Racer Fords. The dash will be furnished by Enterprises only. P/N
180100 or 180101
k. Required Bodywork Modification:
A 22.5" diameter wheel arch shall be cut in each side of the tail section. Viewing the tail section from the side, draw a vertical
line at the drive axle centerline. Locate the top of the wheel arch at a point measured from the bottom edge of the tail section
9.25" vertically along the centerline. The 22.5" diameter circle intersects the bottom edge of the tail section 11.1" either side of
the centerline. The tail section may be reinforced in the forward and aft portions of the wheel arch. Dimension tolerance is +/-
0.75".
l. An alternate dash panel has been approved for use in Spec Racer Fords. The dash will be furnished by Enterprises only. P/N
180100 or 180101."

SRF Tire Rule Update

#32614 from Robey Clark · Rule change · TB 22-06 (2022-06 Fastrack)

In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Tires: must be run as delivered."

Brake, seal, and air filter clarifications

#32670 from Club Racing Board · Rule change · TB 22-06 (2022-06 Fastrack)

In SRF, GCR section 9.1.8.D.1.X.g, change as follows:
"Brakes: Hawk Blue 9012 pads P/N 801993 must be used. Wilwood vented rotor P/N 800065 shall be used as delivered with no
machining of any kind. Minimum thickness 13.25 12.20mm (0.522 0.481"). The 1985 Renault Alliance solid front rotor (Reference:
Bendix PRT1318 or Centrix 121.11004) may be used on front, rear, or both axles, but each axle must be paired to the same type
rotor. Rubber caliper bushings may be replaced with bronze bushings P/N 1196185 or P/N 1196185."
In SRF, GCR section 9.1.8.D.2.H, change as follows:
"No performance M modifications of any kind.
SCCA Enterprises’ seals shall be intact.

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(2) on cam cover, (2) on the oil pan, (1) on the each cam shaft. Automatic Drivetrain Violation if removed."
In SRF, GCR section 9.1.8.D.2.H.23, change as follows:
"Air Filter: P/N WM301020 or K&N RC-9160"

Three Updates to SRF Rules

#31523 from Robey Clark · Rule change · TB 21-12 (2021-12 Fastrack)

In SRF, GCR section 9.1.8.E.1.X.f, change as follows:
"Wet:
Front – Hoosier P/N 46100 P185/60R13 H20
Rear – Hoosier P/N 46105 P205/60R13 H20
Ground clearance is 2.5" with driver as raced when H20 tires are used.
or
Front – Hoosier P/N 46100 P185/60 65R13 W2 (effective Oct. 4, 2021)
Rear – Hoosier P/N 46105 P205/60R13 W2 (effective Oct. 4, 2021)"

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In SRF, GCR section 9.1.8.E.2.H.24, change as follows:
"Air Box: P/N G592230 Mandatory unmodified As delivered, except as noted under body work, Air Box floor vent must remain
open and un-obstructed."
In SRF, GCR section 9.1.8.E.2.H, add a new section as follows:
"25. SRF3 Restrictor plate: P/N G301048 As delivered, installed between throttle body and intake manifold. Mandatory Jan. 1,

A specification table follows in the original; it is not shown here.

SRF Wet Tires

#30849 from Robey Clark · Rule change · TB 21-08 (2021-08 Fastrack)

In SRF, GCR section 9.1.8.E.1.X.f, make changes as follows:
"Dry:
Front – Hoosier P/N 46340 P185/60ZR13 SRF
Rear – Hoosier P/N 46350 P205/60ZR13 SRF
Wet:
Front – Hoosier P/N 46100 P185/60R13 H20
Rear – Hoosier P/N 46105 P205/60R13 H20
or

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Front – Hoosier P/N 46100 P185/60R13 W2 (effective Oct. 4, 2021)
Rear – Hoosier P/N 46105 P205/60R13 W2 (effective Oct. 4, 2021)"

SADEV-SRF3 Transmission

#30926 from Robey Clark · Rule change · TB 21-08 (2021-08 Fastrack)

In SRF, GCR section 9.1.8.E.2.K, make changes to gear ratios as follows:
"Gear Ratios:
Ford/Mazda OEM 5-Speed:
1st 3.42 : 1
2nd 1.84 : 1
3rd 1.29 : 1
4th 0.97 : 1
5th 0.77 : 1

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Final Drive Ratio: 3.85
OR
SADEV-SRF3 6-Speed Sequential (beginning Oct. 4, 2021):

A specification table follows in the original; it is not shown here.

SRF Update Maintenance, Repairs and Seals

#30961 from Robey Clark · Rule change · TB 21-08 (2021-08 Fastrack)

In SRF, GCR section 9.1.8.E.1.C, make changes as follows:
"If any official Enterprises seal is broken, by an Enterprises Customer Service Rep. (CSR) emergency field repair, accident, or
intent, the procedures outlined under C.20., section S shall be followed. Parts with an Enterprises part number having the prefix
"10" are considered to be unrestricted, providing provided their dimensions are comparable."
In SRF, GCR section 9.1.8.E.1.S, make changes as follows:
"SCCA Enterprises' seals on engine are required for all races must be present on driveline components in designated locations for
all SCCA sanctioned events. Any competitor who runs participates in an event without all proper engine seals in the required
locations shall have his engine removed and shipped to Enterprises for testing and sealing after that event must remove his

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unsealed component and it must be inspected by a Customer Service Rep. (CSR) or Enterprises. Notation shall be made in the
vehicle logbook and seals checked prior to the next event. The competitor will be responsible for all cost incurred by this
procedure. regardless of the findings, and If the component is found to be out of specification, the competitor is subject to
penalty by the SOM if engine is found to be not as specified."
"SCCA Enterprises' seals are required on all SPEC RACER FORD engines and transmissions."

SRF3 Alternator Pulley

#30684 from Robey Clark · Rule change · TB 21-06 (2021-06 Fastrack)

In SRF, GCR section 9.1.8.E.2.H.17, add the following:
"Alternator Pulley: P/N G902130 or P/N G902130A. 12oz minimum weight"

Mandatory identification:

#30223 from Robey Clark · Rule change · TB 21-03 (2021-03 Fastrack)

In SRF, GCR section 9.1.8.E.2.B, change as follows:
"Mandatory identification: "SRF3" near the side car numbers,. Approved (2) “Ford Performance” on each sideof the engine cover
plus a Ford Blue Oval on the center of the Nose & (2) “Performance Electronics” on eachside of the tail. "Hoosier" logo (4) on
both sides front lower outer corners of the nose, and each side of the tail."

SRF Shocks, Springs and Ride Height.

#29688 from Robey Clark · Rule change · TB 20-12 (2020-12 Fastrack)

In SRF, GCR section 9.1.8.E.1.I, change as follows:
"NO MODIFICATIONS ALLOWED. Only SCCA Enterprises sealed Penske shocks P/N 280396 shall be used. Only front spring P/N
280387 or P/N RO28037 shall be used. Only rear spring P/N 280390 shall be used. Effective May 1, 2020, o Only the SCCA Bump
Stop P/N 280407 may be used, with no modification of any kind. Bump stops are optional. If used, only one bump stop per shock
is permitted."
"All shock absorbers must be sealed by SCCA Enterprises. Prior to sealing, the shock absorbers will shall be rebuilt
by SCCA Enterprises or its authorized rebuilders."
In SRF, GCR section 9.1.8.E.1.X, change as follows:

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"c. Rear Springs: 412-429 lbs./in Enterprises P/N 280390 or previous Enterprises supplied part (ex.RO280388 or RO280389)."
"h. Shock Absorbers: Only the Penske shock P/N 280396 with spec valving shall be used as a sealed assembly, with no
modification of any kind. If shock seals are damaged in any way, the shock must be sent to an authorized SCCA Enterprises
service center for verification and resealing at the competitor’s cost. Effective May 1, 2020, o Only the SCCA Bump Stop P/N
280407 may be used, with no modification of any kind. Bump stops are optional. If used, only one bump stop per shock is
permitted."
"i. Ground Clearance: Minimum is 2.75 inches measured at the frame on the front and rear axle lines without driver, as raced."

SRF Shocks

#28791 from Robey Clark · Rule change · TB 20-06 (2020-06 Fastrack)

In GCR section 9.1.8.E.1.I, change as follows:
"NO MODIFICATIONS ALLOWED. Effective May 1, 2020, only the SCCA Bump Stop P/N 280407 may be
used, with no modification of any kind. Bump stops are optional. If used, only one bump stop per shock
is permitted. The same brand of shock absorbers must be used in all shock absorber positions on the
car.
All shock absorbers must be sealed by Enterprises. Prior to sealing, the shock absorbers will be rebuilt by
Enterprises or its authorized rebuilders."

Update Bump Stop Rule

#28712 from Robey Clark · Rule change · TB 20-05 (2019-05 Fastrack)

In GCR section 9.1.8.E.1.I, change as follows:
"NO MODIFICATIONS ALLOWED. Bump stop shall remain on shock but may be slit vertically to ease
removal for shock adjustment. Effective May 1, 2020, only the SCCA Bump Stop P/N 280407 may be used,
with no modification of any kind. Bump stops are optional. If used, only one bump stop per shock is
permitted. The same brand of shock absorbers must be used in all shock absorber positions on the car."
In GCR section 9.1.8.E.1.X.h, change as follows:
"Shock Absorbers: Penske shock P/N 280396 with spec valving shall be used as a sealed assembly, with
no modification of any kind. If shock seals are damaged in any way, the shock must be sent to an

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authorized SCCA Enterprises service center for verification and resealing at the competitor’s cost.
Effective May 1, 2020, only T the SCCA b Bump s Stop P/N 280407 may be used, as delivered with no
modification of any kind;. Bump stops are optional. i If used, maximum of only one bump stop per shock
is permitted. Effective 05/01/2020, only the SCCA bump stop P/N 280407 may be used as delivered with
no modification of any kind; if used, maximum of one bump stop per shock."

SRF Bump Stop Correction

#27019 from Robey Clark · Rule change · TB 19-07 (2019-07 Fastrack)

In SRF, GCR section 9.1.8.E.1.X.h, make changes as follows:
"Shock Absorbers: Penske shock P/N 280396 with spec valving shall be used as a sealed
assembly with no modification of any kind. If shock seals are damaged in any way, the
shock must be sent to an authorized SCCA Enterprises service center for verification and
resealing at the competitor’s cost. Beginning
05/01/2020 2019, the SCCA Enterprises bump rubber stop P/N 280407 may be used as
delivered with no modification of any kind; if used, maximum of one bump rubber stop per
shock. Effective 05/01/2020, only the SCCA bump stop P/N 280407 may be used as

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delivered with no modification of any kind; if used, maximum of one bump stop per
shock.”

SRF Rain / Brake Rule - BoD approved as follows

#34958 from Board of Directors · Rule change · TB 23-10 (2023-10 Fastrack)

In SRF, GCR section 9.1.8.D.1.W.l, change as follows as approved by BoD on 9/12/2023:
"This rule supersedes GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024."

SRF Tire Warmer Rule

#27622 from Robey Clark · Rule change · TB 19-12 (2019-12 Fastrack)

In SRF, GCR section 9.1.8.E.1.V.s delete section in its entirety as follows and re-letter as follows:
"It is forbidden to regroove tires."
In SRF, GCR section 9.1.8.E.1.X.f, add new sections as follows:
"Tires:
Dry:
Front – Hoosier P/N 46340 P185/60ZR13
Rear – Hoosier P/N 46350 P205/60ZR13 SRF
Wet:

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Front – Hoosier P/N 46100 P185/60R13 H20
Rear – Hoosier P/N 46105 205/60R13 H20
1. It is forbidden to regroove tires.
2. The use of tire warmers or cooling methods other than natural air convection or conduction is
prohibited. The penalty for violation will be the loss of qualifying times and/or the disqualification of race
results."

SRF / SRF3 Nose Weight Reduction

#27706 from Robey Clark · Rule change · TB 19-12 (2019-12 Fastrack)

In SRF, GCR section 9.1.8.E.1.E.a, change the minimum weight as follows:
"Front 35 32 lbs."

SRF / SRF3 Majors & Regional Class Updates

#27723 from Robey Clark · Rule change · TB 19-12 (2019-12 Fastrack)

In SRF, GCR section 9.1.8.E, make changes as follows:
"SPEC RACER FORD 3 (SRF/SRF3)"
In SRF, GCR section 9.1.8.E.1, make changes as follows:
"SPEC RACER FORD 2 (SRF) Regional Only Class"
In SRF, GCR section 9.1.8.E.2, make changes as follows:
"SPEC RACER FORD 3 (SRF3)"
In SRF, GCR section 9.1.8.E.2.A, make changes as follows:
"It is the intent of the SRF3, GEN3 a Ford 1.6L conversion, to update the current 1.9L SRF drivetrain for

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class longevity. SRF and SRF3 shall compete side by side, for respective points and championships."

SRF Dash Windscreen Kit

#27028 from Robey Clark · Rule change · TB 19-07 (2019-07 Fastrack)

In SRF, GCR section 9.1.8.E.1.V, add the following:
"ii. Dash Windscreen Kit, P/N 1180103 or P/N 180102, is allowed."

New SRF Sectional Nose Rule Addition

#26914 from Robey Clark · Rule change · TB 19-06 (2019-06 Fastrack)

In GCR section 9.1.8.E.1.E, add the following:
"NO MODIFICATIONS ALLOWED (except as specified). The SRF multi-piece nose assembly is approved for use."

SRF Brakes and Shock Rule Changes

#26629 from Robey Clark · Rule change · TB 19-05 (2019-05 Fastrack)

In GCR section 9.1.8.E.1.X.g, make changes as follows:
“Brakes: Hawk Blue 9012 pads P/N 801993 or 801994 must be used. Wilwood V vented
rotor P/N 800065 minimum thickness 13.25mm (0.522 in.); shall be used as delivered with no
machining of any kind, P/N 800065. Minimum thickness 13.25mm (0.522”). Rubber caliper
bushings may be replaced with bronze bushings P/N 1196185 or P/N 1196185(or A or B).
Original caliper pistons may be replaced with vented caliper piston P/N 1196184; no other
modification allowed. Wilwood caliper with bracket universal fit P/N 800038 may be used as
delivered with no modification of any kind. Wilwood knock back spring (2.63 lbs.) P/N 800045

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may be used as delivered with no modification of any kind; maximum of one spring per
caliper.”
In GCR section 9.1.8.E.1.X.h, make changes as follows:
“Shock Absorbers: Standard Koni shock, P/N 82X-2255-SPA1 with standard oil
or Penske shock P/N 280396 with spec valving shall be used as a sealed assembly with
no modification of any kind. If shock seals are damaged in any way, the shock must be
sent to an authorized SCCA Enterprises service center for verification and resealing at the
competitor’s cost. The bump rubber provided with the shock shall be used in unmodified, stock
condition. No Koni or alternate bump stop is permitted to be used with the Penske shock.
Shortening the Penske shock bump rubber is allowed. All shock absorbers must be sealed by
Enterprises. Prior to sealing, the shock absorbers will be rebuilt by Enterprises or its authorized
rebuilder. Beginning 05/01/2020, SCCA Enterprises bump rubber P/N 280407 may be used as
delivered with no modification of any kind; if used, maximum of one bump rubber per shock.”

Other letters

Clarification of the Restrictor Rule, 9.1.8.D.2.H.25.

#40260 from Thomas Jackson · Not recommended · Minutes (2026-07 Fastrack)

The Road Racing Competition Committee does not recommend adding a bore diameter to the GCR rule for the restrictor plate
required on all SRF3 cars competing in SCCA races. The restrictor plate required by 9.1.8.D.2.H.25 has a blue anodized finish and
includes a blue tab that is visible to scrutineers. The blue restrictor plate is marked with a logo and serial number but does not
feature the part number. The silver aluminum sheet plate described in the request was used to provide a flat surface for the
throttle body gasket but provided no restriction to the throttle body. After the blue restrictor plate was added to the rules, the
silver aluminum sheet plate was no longer needed because the blue restrictor plate provided a flat surface for the throttle body
gasket. Nothing prohibits competitors from continuing to use the silver aluminum sheet plate along with the required blue
restrictor plate, but the silver aluminum sheet plate is unnecessary and is not required by the rules.

Engine, Driveline & Penalties

#39424 from Robey Clark · Recommended to the Board · Minutes (2025-12 Fastrack)

In Spec Racer Ford, GCR section 9.1.8.D.1.F.a, change as follows:
"NO MODIFICATIONS ARE ALLOWED EXCEPT WHERE SPECIFICALLY AUTHORIZED WITHIN THESE RULES. This includes all fuel injection
and engine management components, including exhaust, cooling, electrical, and lubrication systems. All systems are subject to test
procedures and must conform to OEM / RFSRII / SCCA Enterprises specifications. All fluids, except fuel, are unrestricted."
In Spec Racer Ford, GCR section 9.1.8.D.1.T, add the following:
"If a competitor refuses to give their components, engine and/or transaxle units for testing per a request of the Class Compliance
Chief (CCC) or Chief Steward (GCR 5.12.2.C.), the following penalties will automatically be imposed:"
In Spec Racer Ford, GCR section 9.1.8.D.1.T.d, add a new section and change as follows:

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"4. Any drivetrain part found to be out of spec, during voluntary or involuntary inspection, will constitute a Drivetrain Violation.
Penalties may be assessed post event.
4. 5. For a second illegal Drivetrain Violation, the competitor will be permanently disqualified from further Spec Racer Ford "SRF –
SRF3" competition. Drivetrain Violation components will be identified within the class Specifications. Drivetrain Violations will be
permanently tracked."

Air Filter PN Correction for SRF3

#36676 from Shawn DeKold · No action required · Minutes (2024-10 Fastrack)

Thank you for your letter. Please see the response to letter #36681 in the current Fastrack.

One Set of Tires for Qual. and Race. Request

#36327 from Nils Musaeus · Not recommended · Minutes (2024-08 Fastrack)

Thank you for your letter. The Club Racing Board does not recommend this change. SRF/SRF3 cars have used these tires for nine
years and to the overall satisfaction of the participants. Enterprises and Hoosier developed the tire to provide 10-12 heat cycles
with very limited lap time deviations, and the tire has generally performed on that level. In addition, marking the SRF3 tires
would be a staffing and timing problem for our volunteers due to the large fields of SRF3 cars entered at most U.S. Majors
events.

Cool Shirt Reservoirs

#34300 from Elliott Freireich · Not recommended · Minutes (2023-06 Fastrack)

Thank you for your letter. SCCA Enterprises will not allow a hinged panel on any part of the bodywork of the SRF and SRF3 cars.

Consider chassis revision to SRF for driver intrusion protection

#31350 from Richard Wiese · No action required · Minutes (2021-11 Fastrack)

Thank you for your letter. Enterprises will take your comments and suggestions under advisement for future consideration.

SRF Pedal Face Modifications

#31073 from Noah Hambayi · Not recommended · Minutes (2021-09 Fastrack)

Thank you for your letter. Enterprises does not recommend this change.

Request for Wheel Tethers

#27657 from Mark Peyser · Not recommended · Minutes (2020-01 Fastrack)

Thank you for your letter. The Club Racing Board does not recommend this change at this time. While
wheel tethers have become relatively common in professional racing series, implementation of such a
requirement in all open-wheel and sports-racing classes in the SCCA road racing program could not be
readily accomplished at this time. Unlike professional racing series, which often use a single, spec chassis
and typically involve a relatively small number of sponsored competitors, the SCCA road racing program
includes dozens of chassis variations and hundreds of competitors of varying means. Wheel tethers are
not commercially available for every chassis type in the road racing program and therefore would likely
need to be custom-made for each application. In addition, the SCCA’s volunteer technical staff does not

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have the resources to verify proper fitment of custom-made wheel tethers on each and every chassis
variation that exists in the road racing program.

Request guidance for letter #26998

#27308 from Lawrence Steckel · No action required · Minutes (2019-09 Fastrack)

Thank you for your letter. It is not the Club Racing Board's role to advise Emergency Services on the
method to be used when towing a particular type of vehicle.

Proposal for a 2 inch tow eye on Spec Racer Ford cars

#26998 from Lawrence R. Steckel · Not recommended · Minutes (2019-08 Fastrack)

Thank you for your letter. Enterprises does not recommend this change.