Alternate cylinder heads for full prep engine builds - Evaluation
#31851 from American Sedan Committee · Rule change · TB 22-01 (2022-01 Fastrack)
In AS Spec Lines, change Notes as follows:
Chevrolet/Pontiac Camaro & Firebird (82-92): "Modify the following full preparation specification lines: "Edelbrock Cylinder
Head Part #s 608979, 608879 are permitted. For regional competition only, unmodified GM Performance cylinder head part #s
1930 → 0955, 1930 → 0956 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."
Chevrolet/Pontiac Camaro & Firebird (93-02): "Modify the following full preparation specification lines: "Edelbrock Cylinder
Head Part #s 608979, 608879 are permitted. For regional competition only, unmodified GM Performance cylinder head part #s
Show 23 more lines
1930 → 0955, 1930 → 0956 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."
Chevrolet Camaro (10-15): "Modify the following full preparation specification lines: "Edelbrock Cylinder Head Part #s 608979,
608879 are permitted. For regional competition only, unmodified GM Performance cylinder head part #s 1930 → 0955, 1930 → 0956
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."
Ford Mustang Incl. Cobra & Cobra R (79-93): "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."
Ford Mustang Including Cobra 94-04: "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."
Ford Mustang GT (05- 14): "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."