540 Piston questions and manufacturers
I am looking for a new set of pistons for my 540 to increase my compression from 12.8:1. My combination is a 4.500 bore, 4.25 stroke, with a 6.385 rod. My engine consists of a Holley 1250 dominator, ported Edelbrock Super Victor intake, Dart 355 CNC heads, and 4340 crank and rods. I want to be in the 14.5:1 to 15:1 compression ratio somewhere. Ross has a set of pistons that have a 49 cc dome, 14.5 comp .600 dome height, 1.273 ch, and a 589 grahm weight. JE also make a piston that has a 45 cc dome, 14.3 comp. 1.270 ch, and a 652 grahm weight. Which one of these pistons would work better for my motor and why, or should I use a piston?
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http://www.brcperformance.com/chevy454shortdeck.htm
http://www.brcperformance.com/chevy454flattop.htm Or we can do anything you want in a custom piston. Ed |
You will not be dissapointed with BRC.
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Originally Posted by edvancedengines
http://www.brcperformance.com/chevy454shortdeck.htm
http://www.brcperformance.com/chevy454flattop.htm Or we can do anything you want in a custom piston. Ed |
My combination is close. Both motors bore 4.530 with 4.250 stroke. We have JE in 1 motor and just sold Wiseco out of the other. Both work great and have no problems getting them.
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my advice, would be to mill the heads a bunch. You could easily get 14+:1 by doing that. That way, you save the cost of rings, bearings, hone job, the pistons, re-balancing, etc. You would be at the point of diminishing returns, by going much more than that. If you changed nothing, except bumped the compression, you won;t notice much gain anyhow. It will pick up for sure, but, if you switch pistons, I don't think you would be happy with the money per hp increase, and, more important, the gain in et. At the level your at, it takes big gains in power to do much. I pick guys up 50+hp all the time, by refining their combos, generaly, porting the heads, and, its usualy good for .2-.3 tenths, and 3-4mph. I don;t think you would even come close to those gains just from a compression increase. Thats my advice
Frank Advanced Performance www.get-ap.com |
Originally Posted by Pwmax
my advice, would be to mill the heads a bunch. You could easily get 14+:1 by doing that. That way, you save the cost of rings, bearings, hone job, the pistons, re-balancing, etc. You would be at the point of diminishing returns, by going much more than that. If you changed nothing, except bumped the compression, you won;t notice much gain anyhow. It will pick up for sure, but, if you switch pistons, I don't think you would be happy with the money per hp increase, and, more important, the gain in et. At the level your at, it takes big gains in power to do much. I pick guys up 50+hp all the time, by refining their combos, generaly, porting the heads, and, its usualy good for .2-.3 tenths, and 3-4mph. I don;t think you would even come close to those gains just from a compression increase. Thats my advice
Frank Advanced Performance www.get-ap.com |
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