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Originally Posted by Hog
Excellent comparison, boy are we spoiled nowadays. (snip)
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Mr. Hog gets a Beacon of Reality Award for that spot-in statement!
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It would have been nice to see a set of Corvette style BBC manifolds tried as well. The manifolds/Camaro exhaust on the 1969 ZL-1 Camaro with the all aluminum ZL1 427 BBC brought the 500-535hp output of the ZL1 427 down to about 275hp as per testing done at the Tonawanda plant. Chev knew that the buyers of these cars were going drag racing and would be ripping the stock Camaro manifolds and exhaust off of them anyways, so why design a complete new exhaust for only 69 cars.
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Point well taken but some of the supporting numbers puzzle me. Using the rating systems of that period, ZL1s made either 560-hp (if you believe unofficial "real" numbers) or 430-hp (if you believe the "official" power rating. No question that when a stock Camaro exhaust was attached there'd be a big loss, but a loss of more than 50%? Not sure I buy that. What testing done at Tonawanda are you talking about? I didn't think there were any dyno cells at Tonawanda back then which could accomodate a full OE exhaust system. Can you post the numbers and the testing method used? Or at least post the source for your info.
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I'm sure the 2 or 3 (depending who you're talking to) ZL=1 Corvettes stock exhaust would cut into the power a bunch as well, although there would be more incentive to do a better exhaust for the Vettes, as there was the ZL-1 cars, and the 20 L88's for 67, 80 for 68 and 116 for 1969.
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C2/C3s with L88s or ZL1s used the same exhaust system as other Big Blocks, ie: the pretty darn good Corvette BB exhaust manifolds, 2.5-in pipes and the bigger mufflers.