Swift Bulletproof Coil-Over Spring - 3.5" ID x 16" - 140 lb. Ducts & Accessories 10 and 12 cylinder engines

10 and 12 cylinder engines equipped with conventional or performance ignitions and operating ranges up to 16

780 lb/in Spring Rate

Pre-set at 2

or a blackout cover to hide it completely

Swift Bulletproof Coil-Over Spring - 3.5" ID x 16" - 140 lb. Ducts & Accessories 10 and 12 cylinder enginesINCREASE TRACTION, LESS UN SPRUNG MASS, MORE STROKE, INCREASED HANDLING. THE ONLY THING YOU WILL BE LOSING IS TRACK TIME. 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 superior engineering has provided the next generation of