Quote:
Originally Posted by scott70
My iron headed and iron intake 455 made 491/570 trq with 1.75 headers and lost about 17hp with the 2.25 ra manifolds with mandrel 2.5 headpipes. I did try to massage the outlet size on the exhaust manifolds with a electric grinder some. I bought my aftermarket manifolds many years ago,even maybe when they were first introduced. I ground as much as I dared to but still not out to 2.45"
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Scott70, Those are great numbers and minimal losses going to RA manifolds from the headers. Do you have the Dyno printouts for the two? It would be interesting to see when (rpm) the power dropped.
Dennis