Mr. Gasket 7846 Harmonic Balancer Bolt
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Mr. Gasket Harmonic Balancer Bolt & Washer Set for 1965-2000 Chevy 396-502 Mark IV and Generation V Big Block. Fits 366,396,402,427,454, and 502 big block Chevrolet. 1/2-20 x 1-1/2 inch heat treated, black oxide coated Grade 8 alloy steel with a tall hex head to prevent wrench slippage. The extra thick parallel ground washer provides accurate, uniform torque.