Manley Valve - Exhaust, Valve-LS7 S/D 1.615 1987-pontiac-firebird-esi3246161 If you have a BMR

If you have a BMR Suspension K-member with integrated engine mounts

This two-point design solidly links the front strut towers

Spring notes: The springs are designed for Chevrolet small block engines

Grade 8 hardware

the 6579 is a true high performance upgrade worthy of consideration

Manley Valve - Exhaust, Valve-LS7 S/D 1.615 1987-pontiac-firebird-esi3246161 If you have a BMRManley Severe Duty Valves deliver the ultimate in strength, reliability, and high performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH 428 for exhaust and NK 844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400F, Manley exhaust valves endured 100 million cycles, while competitors failed after just