Posted by CoopertownBob on January 11, 2014 at 20:48:55 from (67.172.102.201):
In Reply to: HP vs Cu. In. posted by Mike (WA) on January 06, 2014 at 14:04:46:
Right. I believe, if memory doesn't fail me, that Chevy's 450 HP rated 454 in 1970 ended up all the way down to like 245 when they changed to SAE as installed standards, by like 1973 or so. Of course, this was also the beginning of the Federal mandated emissions, which led to big changes in tuning specs to meet those standards.
Something that always strikes me as funny is, I used to hear guys talking about changing out the heads, cam, adding headers, different carb, and so forth, just looking for 50 or so HP. With some of those old all motor cars, you could get that much just by changing the mufflers!
Another really big thing that has contributed to the higher HP 'installed' ratings is the much closer tolerances they can put today's engines together to. In the late 60's, a Z-28 Camaro was factory rated at 290 HP, which was obviously intentionally low, but if you balanced and blueprinted the engine, they made more like 500 HP. Back in the day, the NHRA re-rated them several times to account for this fact, trying to keep other cars that 'on paper' should have been equal, competitive with them. I don't think you could realize that same kind of gain with today's engines from doing that, simply because they are put together so much closer to 'blueprint' from the factory.
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