Wilwood Superlite Internal 4 Caliper- RH - 1.88" / 1.75" Pistons - 1.250" Rotor - 3.5" Mount H778001M If you own an RH5R

If you own an RH5R or V3 Radio

550 ROLLER VALVE SPRING

Will feed up to 400 horsepower throttle body efi unit (not intended for multipoint efi)

1973-1973 Pontiac Firebird

Wilwood Superlite Internal 4 Caliper- RH - 1.88" / 1.75" Pistons - 1.250" Rotor - 3.5" Mount H778001M If you own an RH5RFSLI4 and FSLI4 ST calipers provide the pad wear performance advantages of differential bore pistons with the option for ultimate heat protection using Thermlock pistons in the ST models. Differential piston bores compensate for leading edge mechanical loading and temperature variances across the pad face to reduce pad taper wear in sustained high temperature applications. Thermlock pistons in the ST models block heat transfer from the pads and reduce