Back in the '60s, the car companies seemed to put whatever hp rating they liked on the various engines. For drag racing Ford decided to low ball the 428 Cobra Jet at 335 hp, the same as the 390. A definite advantage in NHRA. The '66 L72 cars came down the line for a short time with the 450 hp stickers and then they were changed to 425 hp. This according to a friend who worked on the line in Oshawa at the time. Same engine. Different numbers. 425 hp was probably a lot more accurate for an L72 engines and they would probably need a little help at that. Not that they couldn't make a lot more power with a few changes.
Ask Rob.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.
