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Ships within 48 hours · Estimated delivery Aug 21 - Aug 26
Installation time is about 3-4 hours and may vary depending on stock bushing removal technique
Heavy Duty
but too much slipperiness causes excess wheel spin
inspection and rebuilding
Drag ''R'' Series and non-adjustable valving allows for your choice of ride quality
Manley Valve - Exhaust, Valve-S/D 1.625,+.700 1984-pontiac-firebird-esi1382254 Installation time is about 3-4Manley 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
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