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The Mark IV big block was the culmination of Chevrolet's performance engine development. Featured in early Camaros, Novas, Chevelles, Monte Carlos, Bel Airs, Impalas, and Corvettes, the popular 396 powerplant terrorized local drag strips and gave high performance engines a new standard. The success was short lived due to fuel shortages and emission standards. But fear not! The horsepower happy big block lives on and Speedway Motors is your source for performance parts and accessories for your 396 Chevy engine.

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396, 402, 427, 454, 1/4-20 x 3.37" Thread Pitch, Steel

Thread Pitch: 1/4-20 x 3.37"

Material Type: Steel

Finish: Silver

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396, 402, 427, 454, 1/4-20 x .75" Thread Pitch, Steel

Thread Pitch: 1/4-20 x .75"

Material Type: Steel

Finish: Silver

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