Holden 253 304 308 12 Point Black Oxide Intake Manifold Bolt Kit Speedmaster valve seals are posi-stop

Speedmaster valve seals are posi-stop seals made from high-temperature Viton¨ material for a long-lasting seal

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They are made of aluminum and feature a natural finish

Speedmaster valve cover gaskets are an excellent choice for engines

Speedmaster radiator overflow tanks are both functional and stunning to look at

Holden 253 304 308 12 Point Black Oxide Intake Manifold Bolt Kit Speedmaster valve seals are posi-stopSpeedmaster 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.