Features Fastener Style – Bolt. Thread Size – 3/8-16 in. Fastener Material – Chromoly. Fastener Finish – Black oxide. Fastener Head Style – Hex. Wrench Diameter – 9/16 in. Underhead Length (in) – 1.000 in. Fastener Yield Strength (psi) – 180,000 psi. Washers Included – Yes. Application Make – Chevrolet. Year – 1985-1999. Engine Family – Chevy small block Gen I, Chevy big block Mark IV.
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