PRW Industries Cylinder Head Stud Kit - 12 Point Head - Chromoly - GM LS-Series 1034661 JB1SM 75W90 GL-4 gear oil (similar

75W90 GL-4 gear oil (similar to SAE 5W40/10W40 engine oil viscosity)

Good improvements over the factory Apache camshaft

High Lift heads have increased valve clearance and increased flow capacity

Designed for use on any Holley model 4150 carburetor with center hung "cathedral" fuel bowls

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PRW Industries Cylinder Head Stud Kit - 12 Point Head - Chromoly - GM LS-Series 1034661 JB1SM 75W90 GL-4 gear oil (similarProduct Description: Cylinder Head Stud Kit 12 Point Head Chromoly Black Oxide GM LS Series PRW Industries produces engine components for racing applications such as rocker arms, valve covers and main caps to name a few. These products offer performance gains at a value price. Over a decade ago, PRW Industries, Inc. (PRWI) recognized the need for branded, high performance after market parts that were value priced, and readily available on an in stock