Chevy 402 Big Block Specs

by Manny Jeter
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The Chevy 402 big block is a Big Block Chevy (BBC) engine created in the 1970s. The Chevy 402 engine is now mainly found in American muscle cars, such as the Chevrolet Camaro and Monte Carlo, and trucks and other vehicles big enough to hold the engine. BBC engines are known for their size and power. Many BBC engines are purchased as an aftermarket option. You can buy the complete Chevy 402 big block engine or you can buy an incomplete one. Incomplete BBC engines are used to make adjustments or add parts to the engine.

General Specifications

Chevy 402's displacement measures 402 cubic inches, or 6.6 liters. The BBC engine has a stock bore of 4.125 inches and a stock stroke of 3.76 inches. The Chevy 402 engine has an aluminum head and eight cylinders. It takes unleaded gasoline and is considered to be a gas guzzler.

Acceleration & Power

The Chevy 402 big block has horsepower of 375 at 5,600 rpm. The engine has a torque of 415 pounds-feet at 3,600 rpm. Also, the engine can get over 400 horsepower on a dyno.


The Chevy 402's main cap bolt has 95 pounds-feet of torque. The 3/8-inch rod has a torque of 50 pounds-feet and the 7/16-inch rod has a torque of 67 to 73 pounds-feet. The long cylinder head bolts have 75 to 80 pounds-feet of torque. The short cylinder head bolts have 65 to 68 pounds-feet of torque.

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