Swift Bump Spring - 5000 lb. Blow-Off Valve Fuel Injected Engines: E85 up

Fuel Injected Engines: E85 up to 1330 FWHP - naturally aspirated up to 980 FWHP - forced air induction

1969-1985 Pontiac Firebird

1983-1986 Pontiac Grand Prix

000 RPM on V8's ensuring clean

These Intakes are good looking

Swift Bump Spring - 5000 lb. Blow-Off Valve Fuel Injected Engines: E85 upSwift 2" O. D. bump springs offer the highest measurable shock stroke in the industry and, unlike inefficient rubber and foam bump stops, they are resistant to fatigue and heat. Swift Springs manufactures springs with differing rates for a variety of circle track racing applications. With options for both dirt and asphalt tracks, Swift has a wide range of coil spring formats, including coil over, dual rate, bump springs, and more. Swift Springs