What Are the Specs of a Chevy Big Block Engine?


Quick Answer

As of 2015, Chevrolet's ZZ572/720R Deluxe Dyno big-block engine is a cast-iron V8 with four-bolt main caps, a forged-steel crankshaft, forged-steel shot peened connecting rods and forged aluminum pistons. The engine has a 572-cubic-inch displacement with a 4.560-inch by 4.375-inch bore/stroke ratio. The cylinder heads are aluminum rectangular port with 118-cubic-centimeter chambers, the stainless steel intake valves are 2.250 inches and the exhaust valves are 1.880 inches. The engine has a mechanical roller camshaft and a 12-to-1 compression ratio.

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Full Answer

Chevrolet recommends using 110-octane race fuel in its ZZ572/720R big-block crate engine that delivers 720 horsepower at 6250 revolutions per minute with a maximum of 6750 revolutions per minute. The automaker designed the Tall Deck Big-Block V8 engine for use in any off-road vehicle and for street vehicles built before 1976, but did not intend it for marine use. The engine requires an ignition coil, starter and fuel pump, which are not included with the shipment. Chevrolet ships the Dominator-type 1150-cfm carburetor separately and an engine installer must install it. Depending on the vehicle's transmission, the mechanic needs either an internally balanced flexplate or a flywheel.

Chevrolet introduced the Mark II, its 427-cubic-inch big-block V8 engine, at the Daytona 500 in February 1963. The engine earned the nickname Porcupine because of its canted large-diameter valves that point at strange angles.

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