Head Diameter: 1.575 in. - Stem Diameter: .3136 in. - O/A : 4.923 1984-pontiac-firebird-esi1382254 cars and trucks

cars and trucks

Replacement rubber bump stops bolt in place of damaged or worn factory bump stops using existing mounting holes

offering a perfect balance of performance and street versatility

and V6 auto Camaros

degrees C neg 60

Head Diameter: 1.575 in. - Stem Diameter: .3136 in. - O/A : 4.923 1984-pontiac-firebird-esi1382254 cars and trucksManley 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