http://www.chevyhiperformance.com/techarticles/49178_headers_power_increase/index.html
And while I can't find the particular test I wanted to cite that came up with 40HP, take a moment to think about how much potential there is if collector length changes ALONE can make a roughly 12HP difference.
http://www.stockcarracing.com/techarticles/scrp_0704_header_tech/photo_07.html
I just skimmed the first article for the numbers, I didn't see if they even bothered to tune the engine after the swap, which would undoubtedly be worth even more.
Even with the lower numbers on the "base" motor, the torque increases are very large. I don't see the dyno charts, most often in the magazines they are only looking at peak, even though the gains could be higher or lower off-peak, which is important. Dyno sheets would show.
And just because I ran into it, another test (on a different motor obviously) showing that tri-y's are pointless.
http://www.downeyoff-road.com/EngineComponents/ExhaustHeaders.html
And while I can't find the particular test I wanted to cite that came up with 40HP, take a moment to think about how much potential there is if collector length changes ALONE can make a roughly 12HP difference.
http://www.stockcarracing.com/techarticles/scrp_0704_header_tech/photo_07.html
I just skimmed the first article for the numbers, I didn't see if they even bothered to tune the engine after the swap, which would undoubtedly be worth even more.
Even with the lower numbers on the "base" motor, the torque increases are very large. I don't see the dyno charts, most often in the magazines they are only looking at peak, even though the gains could be higher or lower off-peak, which is important. Dyno sheets would show.
And just because I ran into it, another test (on a different motor obviously) showing that tri-y's are pointless.
http://www.downeyoff-road.com/EngineComponents/ExhaustHeaders.html
