Head Diameter: 1.575 in. - Stem Diameter: .3136 in. - O/A : 4.923 1987-chevrolet-camaro-esi9577872 Gibson Exhaust Systems decrease backpressure

Gibson Exhaust Systems decrease backpressure and produce more torque and increased horsepower

Traditional Big Block Chevy engines can now also be fitted with the Holley Brand Hi-Ram type EFI intake manifolds that have so well served GM LS & LT

The all-new 5G & 6G racing suits

Currently EVERY SINGLE ROTOR sold in Europe and the UK is BRITISH MADE and a majority of the designs specific to the USA are also BRITISH made

Head Diameter: 1.575 in. - Stem Diameter: .3136 in. - O/A : 4.923 1987-chevrolet-camaro-esi9577872 Gibson Exhaust Systems decrease backpressureDiscover the extraordinary capabilities of Manley Performance Products' Extreme Duty Series Valves. Engineered to cater to the demanding needs of Top Fuel and Funny Car drag racers, Big Block Chevy marine enthusiasts, and Small Block Chevy restricted carburetor circle track competitors, these valves are your ticket to unparalleled performance.