What this means is that a 370hp LT-1 from 1970 is actually much closer in actual power output to the 300hp LT1 circa 1995. Where the new LS3 small-blocks are tested to the latest SAE net (flywheel) standards and are rated with full accessories, exhaust and the factory induction system (basically the way it comes in the car), pre-1972 engines were rated in optimized condition sans accessories (open dyno headers, no accessories, no air inlet restrictions, etc.). Speaking of ratings, it is also important to note that these differed wildly from those used today by the OEMs. Offering their engines with elevated ratings was not uncommon, as horsepower sold cars and with the lack of available dynos to verify the claims, it was difficult to tell the difference between a 350hp engine and one rated at 370hp. The manufacturers played games with the official power ratings in order to appease the buying public, insurance companies and racing officials alike. We all know now that the power ratings in the old days were somewhat suspect. The LT-1 350 represented the last hurrah for the high-squeeze, solid-lifter small-blocks, as the '71 version made due with just 9.0:1 compression compared to 11.0:1 for the 1970 model.
The DZ302 came about because of the need to produce a 5.0L displacement powerplant for the popular SCCA Trans-Am sedan racing series. Sure, the fuel-injected version of the 327 was rated 10 hp higher than the carbureted L76, but both shared the same internal components. During the muscle car era of the '60s and early '70s, this trio carried the torch into battle for their respective displacements. If you have even an ounce of Bow Tie blood, you will immediately recognize the three names presented above as nothing less than legendary small-blocks.
Chevy Small Block Testing - Legendary Small-Block Shootout We Pit The DZ302 Vs L76 327 Vs LT-1 350 In A No-Holds-Barred, Dyno Dogfight.įrom the September, 2009 issue of Super Chevy
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