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SAE Viscosity Grade (Motor Oil) 15W40
The kit is completely bolt-in
since the extreme slipperiness may cause synchronizer mesh issues that lead to shifting problems
This eliminates almost all upper trailing arm bushing movement
78-88 GM G-Body
Manley Valve - Exhaust, Valve-S/D 1.600,+.200 Shopify Collective SAE Viscosity Grade (Motor Oil)Manley 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
