Simpson Safety - Simpson Racing CarbonX® Ultimate™ Underwear 433 in - Duration 252

433 in - Duration 252 / 252 - 110 LSA - 800 / 4800 RPM - Small Block Ford - Each

81 in OD - C4-R4 Valve - Digressive - Steel - Zinc Plated - Each

875 in - Car - GM 12-Bolt - Kit

Standard mounting patterns on the throttle body flange with a 93mm flange opening include GT350

Includes a Super 50™ Series performance muffler for that perfect blend of a deep aggressive exterior sound

Simpson Safety - Simpson Racing CarbonX® Ultimate™ Underwear 433 in - Duration 252CarbonX and and Ultimate underwear is made from double jersey interlock knit comprised of a patented blend of high performance fibers and has extraordinary thermal protective properties. It is inherently flame resistant, will not burn, melt, or ignite when subjected to direct flame. Nomexandand or CarbonXand andUnderwear underneath a racing suit will dramatically improve Thermal Protection Performance (TPP) in the case of an accident involving fire.