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The 331 came to life as Mark Hedrick fired the engine up in the dyno cell. So far, so good. After getting it up to temperature, Hedrick let the dyno lever fly, and the motor ran up to 6,000 rpm without a hitch—no misfiring, just a smooth pull to redline. The numbers turned out pretty good as well. Peak horsepower on pull 1 came in at 397.2 with peak torque checking in at 388.5. With no changes other than extending redline to 6,100, the 331

A HOLLEY 650-cfm carburetor was chosen for this test, as it's appropriately sized for our 331 stroker and was readily available.

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