Allstar Performance Return Spring Kit 4150 Clear RS00400310 Both come with 100% CNC

Both come with 100% CNC ported 65cc or 75cc combustion chambers and 80cc exhaust ports with a 3/4'' thick head deck (ideal for nitrous or blower applications)

1967-1974 Pontiac Firebird

typically used on the lower section of rear quarter panels

1-1/2 in Hose Barb

1850 lb/hr at 9 psi

Allstar Performance Return Spring Kit 4150 Clear RS00400310 Both come with 100% CNCKits are replacement hardware found on Allstar throttle brackets or may be used when building custom return spring brackets. Specialty items for the Shop, Trailer and Track. The Allstar Performance brand offers thousands of hard to find, specialty items that cover many segments in the performance aftermarket. For over 30 years, customers worldwide have come to rely on the quality, affordable and practical items available from Allstar Performance.