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My repro of the Shelby sales literature shows that the street cars were rated by Shelby at 425HP and the comp cars at 480HP. Probably more realistic as the comp cars were modified. The repro info could be fabricated, but doesn't seem to be.
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... and btw, that "K" camshaft that is listed in the specs. That's my cam. Yeah, baby.:D
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Hmmm, good question about the alloy heads. I thought only a FEW of the comp cars got them, not all of them? For Le Man's I believe Shelby went with a iron high riser head. I wonder which was the better head, alloy of that time or iron high riser? Of course the alloy heads had a weight advantage.
"American Muscle Car" had a show about legend vs reality where they had a shop assemble a number of old school engines using only stock parts that were available when engines were on the street. No modifications were allowed with the exception of an .060 overbore. The FE 427 was probably lucky to get half that for an overbore. Here are the results, the HEMI is particularly note worthy, rated by Chrysler at 425 horse. Uh huh, and pigs fly! :) The Chevy 409/409 ..........................406 HP The Ford 427/425 Tunnel Port..............637 HP The Pontiac 421/421 SD......................488 HP The Chrysler 426/425 Street Hemi.........820 HP The Chevy 427/430 L-88......................527 HP |
This should be a fun conversation. I am going to go and get some popcorn. :D
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So, if I Doug or I want a solid 500 HP on a legitimate dyno we need at LEAST stage 2 heads and possibly a compression bump. |
I think Ernie's sideoiler made 667 HP with open headers, 12.5 CR and not one modern component or so he claims. :rolleyes: :D ;)
Now, the Hawaiian dyno operator, may have been similtaneously waxing his surfboard while talking to cute bikini-clad Hula chick and eating his mixed plate lunch, after previously smoking some of those funny cigarettes or something, as he was dyno'ing Ernie's engine, but no matter. :LOL: Just kidding Ernie. No diatribes necessary. :) I know you engine builders out there sneak a few tricks in there to add HP and claiim it's stock. Just ask the folks who race in the F.A.S.T. class for musclecars. |
Actually, as I mentioned earlier, THAT version of the engine had one very important modern part. The solid roller cam from hell that didn't even begin to make power until about 3,000 rpm. :)
90 plus horse power loss with the side pipes. |
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Earlier today I found an avatar that depicted a man with a long stick. The man was continually beating a dead horse.:LOL:
I couldn't insert that avatar into a REPLY for this thread because the file was too large.:3DSMILE: David |
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Prior to moving up to a bigger engine, I installed a crate Chevy LS6 454/450 engine in my old Corvette. That was a very honest HP figure. A set of AFR heads made it about 500 HP and then I went to crate 540 ci engine that made 600+ HP. All dyno'ed on two different dynos.
I have a hard time believing a stock HP Ford head is equal to a stock HP Chevy head, but what do I know. I'm no expert. |
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David |
Rodknock, most of those GM crate motors make their power from a low rpm roller cam, 5,200-5,500 rpm, in that range. Old school tech was based primarily on high rpm, thats a whole different setup for the heads, intake, etc.
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Obviously, the newest offerings are now roller cam engines. |
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