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BoP Lab / Buttonwillow Raceway Park

AS at Buttonwillow Raceway Park

Track map: sectors and speed trap

Track map with timing sectors and speed trap
Shown for: Cal Club 2026 (practice, qualifying, race) · Cal Club 2025 (practice, qualifying, race)
Class · click a class to switch, + to compare alongside
AS×B-Spec+EP+FA+FC+FE2+FF+FP+FV+GT1+GT2+GT3U+GTX+HP+P+P2+SM+SMX+SRF3+STL+STU+T1+T2+T3+T4+
Events
PosCarDriverClass#Best lapBest theoretical lapBest qual lapBest race lapBest trap speedBest S1Best S2Best S3
1Ford MustangRoger EagletonAS111:55.849 B-R11:55.5691:56.445 B-Q11:55.849 B-R1108.7 B-R131.659 B-Q133.571 B-R150.339 B-R1
2Ford MustangRoss MurrayAS14, 741:56.314 A-R11:56.0471:56.812 A-Q11:56.314 A-R1135.2 A-R232.070 A-R133.689 A-R150.288 A-R1
3Ford Mustang FR500SPratt ColeAS8, 8x1:58.795 B-R11:58.0781:59.911 B-Q11:58.795 B-R1103.3 B-Q132.531 B-R133.997 B-R151.550 B-R1
4Ford MustangMatt LituchyAS301:59.134 B-R11:58.7322:00.395 B-Q11:59.134 B-R1105.1 B-Q132.777 B-R134.259 B-R151.696 B-R2
5Ford MustangMichael LoweAS102:00.612 A-R22:00.1262:03.053 A-Q12:00.612 A-R2126.5 A-R132.652 B-R134.913 B-R152.561 A-R2

One row per driver and car (a driver who changed cars has a row for each). Each cell is that driver's best in that car across the selected events, with the session it was set in; the fastest in each column is purple, and a car whose best lap is more than 115% of the fastest in its class is greyed, marked ">" (with ">115%" beside the driver) and left out of the colour scale. Click a column to sort, a row to highlight it. Theoretical lap is the sum of the best sectors, whichever laps they came from, and never slower than the best lap (where a car's fastest laps were recorded without sector times, its best lap is used). The 115% mark is about the car's best lap only: a car whose best lap is within 115% of the fastest in its class is never marked. Greyed sectors with no theoretical lap mean the sector times on file do not add up to a believable lap. Letters refer to the events above; Q is qualifying, R a race.

Sectors

Sectors are numbered in lap order from start/finish, whatever each event's timing called them; the loop names are SCCA timing's.

Rule changes between these events

Cal Club 2025 → Cal Club 2026 2025-02-22 to 2026-02-21

AS Race memo

#37902 from American Sedan Committee · Rule change · TB 25-03 (2025-03 Fastrack)

In AS Spec Lines, change Notes as follows:
Cadillac CTS-V (04-07) Restricted Prep. 6.0L V8 (Aluminum block, Aluminum heads), LS2, 2 valves/cylinder:
"Any ECM maybe used."
Chevrolet Camaro, Pontiac Firebird (70-81) Restricted Prep. 6.2L V8 (Aluminum Block, Aluminum Heads), 2 valves per cylinder:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (82-92)s 5.7L V-8 LS1 (Aluminum Block, Aluminum Heads) 2 valves per cylinder:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (93-02):

Show 3 more lines

"Any ECM maybe used."
Chevrolet Camaro SS (V8) (10-15) Restricted Prep. 6.2L V8 (Aluminum Block, Aluminum Heads), 2 valves per cylinder:
"Any ECM maybe used."

AS Flotek Head Plunge Cut Inconsistencies

#37502 from Pamela Richardson · Rule change · TB 25-04 (2025-04 Fastrack)

In GCR, Section 9.1.6., replace Figure 1 Value Seat Cutting Dimensions with the following:

AS Notes clean up

#37693 from American Sedan Committee · Rule change · TB 25-04 (2025-04 Fastrack)

In AS Spec Lines, change/add to Notes as follows:
Cadillac CTS-V (04-07):
"Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of the
stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Any ECM maybe used. The
Drive Shaft Shop, Axle shaft part #'s 510220/510221 permitted."
Chevrolet Camaro, Pontiac Firebird (70-81) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #s: 14101081, 14014416 Port Volume (Max.): 081
casting: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 250 lb. weight reduction. Edelbrock Cylinder Head Part

Show 88 more lines

#s 608979, 608879."
Chevrolet Camaro, Pontiac Firebird (70-81) Restricted Prep.:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (82-92) Full Prep.:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #s: 14101081, 14014416 Port Volume (Max.): 081
cast¬ing: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 250 lb weight reduction. Edelbrock Cylinder Head Part
#s 608979, 608879 are permitted. For regional competition only, unmodified GM Performance cylinder head part #s 19300955,
19300956 may be used with Allstar restrictor plate part# ALL26180 and 1.250 inserts part# ALL26186 installed between intake
manifold and insulator. Gaskets may be used (each gasket can be no thicker than .125 inches), one on each side of the restrictor.
All intake air must pass through the inserts of the restrictor plate. Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98,
1.34, 1.00, 0.68 are permitted. Flo Tek Head part #102-500 are permitted."
Chevrolet/Pontiac Camaro & Firebird (82-92) Restricted prep engine:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (93-02) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #’s: 14101081, 14014416; Port Volume (Max.):
081 casting: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 250 lb weight reduction. Edelbrock Cylinder Head
Part #’s 608979, 608879 are permitted. For regional competition only, unmodified GM Performance cylinder head part #s
19300955, 19300956 may be used with Allstar restrictor plate part# ALL26180 and 1.250 inserts part# ALL26186 installed
between intake manifold and insulator. Gaskets may be used (each gasket can be no thicker than .125 inches), one on each side
of the restrictor. All intake air must pass through the inserts of the restrictor plate. Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00
or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted. Fuel cells must be located within 24 inches of the standard tank. The 24 inch
measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with
installation of a safety fuel cell. Flo Tek Head part #102-500 are permitted."
Chevrolet/Pontiac Camaro & Firebird (93-02) Restricted Prep:
"Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of the
stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Any ECM maybe used."
Chevrolet Camaro SS (V8) (10-15) Restricted Prep:
"Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of the
stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Any ECM maybe used."
Chevrolet Camaro (10-15) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #’s: 14101081, 14014416; Port Volume (Max.):
081 casting: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 200 lb weight reduction. Edelbrock Cylinder Head
Part #’s 608979, 608879 are permitted. Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are
permitted. Fuel cells must be located within 24 inches of the standard tank. The 24-inch measurement is taken from the
perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Flo Tek
Head part #102-500 are permitted. Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is
taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel
cell."
Chevrolet Camaro (16-) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #’s: 14101081, 14014416; Port Volume (Max.):
081 casting: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 200 lb weight reduction. Edelbrock Cylinder Head
Part #’s 608979, 608879 are permitted, Flo Tek Head part #102-500 are permitted."
Chevrolet Camaro, 1LE (16-):
"60mm flat plate restrictor required. Any ECM maybe used."
Dodge Challenger (08-20) Restricted Preparation:
"80mm flat plate restrictor is required on the 6.4L engine. Fuel cells must be located within 24 inches of the standard tank. The
24 inch measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with
installation of a safety fuel cell."
Ford Mustang Incl. Cobra & Cobra R (79-93) and Mercury Capri (79-86) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #s: F3ZE AA (GT40), F1ZE-AA (GT-40), F77E-AA
(GT- 40P), Port Volume (Max.): 143.00cc IN/54.00cc EX (GT-40 & GT-40P) with a 250 lb weight reduction. Edelbrock Cylinder
Head Part #s 602579, 602479 are permitted. For regional competition only, unmodified Ford Performance cylinder head part #s
M-6049-Z304DA7, M-6049-Z304D may be used with Allstar restrictor plate part# ALL26180 and 1.250 inserts part# ALL26186
installed between intake manifold and insulator. Gaskets may be used (each gasket can be no thicker than .125 inches), one on
each side of the restrictor. All intake air must pass through the inserts of the restrictor plate. Alternate gear ratio sets 2.88, 1.91,
1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted. Flo Tek Part # 203-500 are permitted."
Ford Mustang Incl. Cobra & Cobra R (79-93) and Mercury Capri(79-86) with Restricted Prep Engine:
"62mm flat plate restrictor is required. Fuel cells must be located within 24 inches of the standard tank. The 24 inch
measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with
installation of a safety fuel cell. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang Including Cobra 94-04 Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #s: F3ZE AA (GT40), F1ZE-AA (GT-40), F77E-AA
(GT- 40P), Port Volume (Max.): 143.00cc IN/54.00cc EX (GT-40 & GT-40P) with a 250 lb weight reduction. Edelbrock Cylinder
Head Part #s 602579, 602479 are permitted. For regional competition only, unmodified Ford Performance cylinder head part #s
M-6049-Z304DA7, M-6049-Z304D may be used with Allstar restrictor plate part# ALL26180 and 1.250 inserts part# ALL26186
installed between intake manifold and insulator. Gaskets may be used (each gasket can be no thicker than .125 inches), one on
each side of the restrictor. All intake air must pass through the inserts of the restrictor plate. Alternate gear ratio sets 2.88, 1.91,
1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted. Flo Tek Part # 203-500 are permitted."
Ford Mustang GT (94-04) with Restricted Prep Engine:
"MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang Cobra and GT 94-95(Restricted Prep):
"1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0l Coyote 15-17 61mm FPR Alternate transmission Ratios 3.66,
2.43, 1.69, 1.32, 1.00, .68. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang including Cobra 96-04 (Restricted Prep):
"1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0l Coyote 15-17 61mm FPR Alternate transmission Ratios 3.66,
2.43, 1.69, 1.32, 1.00, .68. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang Coupe GT (05-14) Restricted Prep.:
"1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0l Coyote 15-17 61mm FPR Alternate transmission Ratios 3.66,
2.43, 1.69, 1.32, 1.00, .68. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted. MT82 6 speed is permitted."
Ford Mustang GT (05-14) with Restricted Prep Engine:
"1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0l Coyote 15-17 61mm FPR Alternate transmission Ratios 3.66,
2.43, 1.69, 1.32, 1.00, .68. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted. MT82 6 speed is permitted."
Ford Mustang GT 5.0l (15-17) Restricted Preparation:
"61mm flat plate restrictor required. Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement
is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety
fuel cell. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang GT 5.0L (2018-):
"60mm flat plate restrictor required. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."

AS Errors and Omission

#38055 from American Sedan Committee · Rule change · TB 25-05 (2025-05 Fastrack)

In AS Spec Lines, Ford Mustang GT 5.0l (15-17), Flat Plate Restrictor Size, change as follows:
"67mm 64mm"

AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO

#38197 from Jim Clark · Rule change · TB 25-05 (2025-05 Fastrack)

In GCR, Section 9.1.6.F., add the following to Intake Part #’s:
"17113697, 19418185, 89017230, 89017363, 89017364, and 89017365, 12561269 and 88894095"

AS Errors and Omissions

#38234 from American Sedan Committee · Rule change · TB 25-06 (2025-06 Fastrack)

In AS Spec Lines, Ford Mustang GT (05-14) with Restricted Prep Engine, add to Gear Ratios the following:
"or 3.66, 2.43, 1.69, 1.32, 1.00, .65"

AS RE: Previous Letter 37695 Update

#38245 from Michael Kamalian · Rule change · TB 25-07 (2025-07 Fastrack)

In AS Spec Lines, Ford Mustang GT 5.0 (2018-), change Weight as follows:
"3600 3525"

Applies to Ford Mustang on this page: Roger Eagleton, Ross Murray, Matt Lituchy, Michael Lowe

AS Cadillac CTS-V BOP Weight Change

#38640 from Alex Lozano · Rule change · TB 25-09 (2025-09 Fastrack)

In AS Spec Lines, Cadillac CTS-V (04-07) Restricted Prep., change Weight as follows:
"(Effective 11/1/2025) 3450 3400"

AS 1994 Mustang Spec Line Request

#39104 from Barry Borgschatz, Jr · Rule change · TB 25-12 (2025-12 Fastrack)

In AS Spec Lines, Ford Mustang GT(94-04) with Restricted Prep Engine, add to notes the following:
"Ford Motorsport #M-6250-F303 camshaft is permitted."

AS Restrictor Plate Change for Gen 2 Ford Coyote Engine

#39501 from American Sedan Committee · Rule change · TB 26-01 (2026-01 Fastrack)

In AS Spec Lines, change Restrictor as follows:
Ford Mustang Incl. Cobra and Cobra R (79-93) and Mercury Capri (79-86) with Restricted Prep Engine: "64 mm 61 mm"
Ford Mustang GT (94-04) with Restricted Prep Engine: "64 mm 61 mm"
Ford Mustang Coupe GT (05-14) Restricted Prep 5.0L/6 speed 4 valves per cylinder: "64 mm 61 mm"
Ford Mustang GT (05-14) with Restricted Prep Engine: "64 mm 61 mm"
Ford Mustang GT 5.0L (15-17) Restricted Preparation: "64 mm 61 mm"

AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request

#39055 from Jason Smith · Rule change · TB 26-01 (2026-01 Fastrack)

In GCR, Section 9.1.6.D.2.h.2., add the following:
"(Effective 2/1/2026) i. Weight based on full preparation chassis choice spec line for GM LM7 5.3L
Carburetor Option:
Must use the full prep 4776 holly carburetor and spacer gasket
Edelbrock Performer RPM 71187 intake manifold
MSD 6014 ignition box
(Edelbrock part # kit 7118)"

What the rules allowed changed as listed; this does not say what any particular car ran.