![]() There were limitations to ordering the big block 427 cubic inch engine. ![]() Given the fact that, especially in the Sixties, engine outputs were sometimes deliberately understated, it is not unreasonable to assume that the output of these two engines was closer to 420 and 450 horsepower respectively. Though it had no more horsepower than the previously developed 396 cubic inch engine, the 427 did pack quite a bit more torque-460lbs/ft instead of 415. Perhaps fortunately for Corvette, it was Carroll Shelby’s two-seat Cobra, which featured its own 427 cubic inch V8 engine that prompted the change of opinion.Ĭhevrolet now felt it would also need a 427 cubic inch engine, and it materialized for the 1966 model year.Īlthough it was effectively a 396 cubic inch engine with a larger 4.25-inch bore, the new 427 big-block engine came in two forms: the relatively mild 元6, which featured a hydraulic-cam and produced 390 horsepower on 10.25:1 compression, and the truly awesome L72, a 425 horsepower engine with 11:1 compression, larger intake valves, a bigger Holley four-barrel carburetor on an aluminum manifold, mechanical lifters, and four-hole (instead of two-hole) main bearing caps. This turnabout in events was rather interesting, especially given GM management’s earlier decree that no car line smaller than a full-size model would carry an engine larger than 400 cubic inches. ![]() With the 1966 Corvette arriving after General Motors’ recent, overwhelming success with the 427 Sting Ray, there was no question that the newest Corvette model would continue to feature big-block engines. The last 2 or 3 digits are the Engine Suffix code which designates the vehicle type or model the engine was installed in.ĮD = Chevelle, Manual Transmission Engine Assembly Plant CodeĬhevrolet Big Block Engine Suffix Codes.C2 Corvette for Sale 1966 Corvette Overview – The Ultimate Guide The numbered 2nd and 3rd digits represent the month and the 4th and 5th indicate the day of the assembly. The first letter of the code designates the assembly factory. Some Truck or Marine blocks may have the codes stamped on the flat block just above the timing cover. The Engine Code is located near the Vin number on the machined boss at the front passenger side of the block. Chevrolet Big Block Engine Code Location. The engine code designates the assembly factory, the date of assembly, and the vehicle model it was installed in. GM Division CodeĦ = Cadillac Chevrolet Assembly Plant Codes Last 6 Digits = Equal the last 6 digits of the vehicle’s VIN.ġ23456 = Matches the last 6 numbers of the VIN of the vehicle the engine was installed in. The 3rd digit denotes the vehicle assembly plant, and the last 6 digits equal the last 6 digits of the vehicle’s VIN that the engine was installed in. The 1st digit represents the GM division. The Engine VIN is a stamped code located at the front passenger side of the block, on the machined boss just below the Head. Chevrolet Big Block Engine VIN Number Location ![]() Chevrolet engine produced prior to 1968 may or may not have a partial Vin. This engine Vin was only federally mandated starting in 1968. The Engine VIN Number is the last 6 or 9 digits of the vehicle’s VIN number. Chevrolet Big Block Engine Identification ![]()
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