Holden 253 304 308 12 Point Black Oxide Intake Manifold Bolt Kit Speedmaster aluminum valve covers feature

Speedmaster aluminum valve covers feature a classic raised

Try a set of these Speedmaster aluminum valve covers

Made from premium materials and built to exacting tolerances

strength and horsepower capabilities are significantly outstanding compared to cast forged crankshafts

They are manufactured from cast aluminum and are offered with breather holes or without any holes

Holden 253 304 308 12 Point Black Oxide Intake Manifold Bolt Kit Speedmaster aluminum valve covers featureSpeedmaster black oxide coated chromoly intake manifold bolts are rated at 170,000 psi. They're precision machined for optimum thread engagement and have a wide area flange for better load distribution. They also feature precision rolled threads, which prevent galling, while promoting more consistent torque loading.