Originally Posted by tcarda
Originally Posted by hammertime
Originally Posted by LuckyDawgRacing
I'm putting back together my 598 and have someone who wants to trade me a set of dart big m heads for my bb2x's both sets are not ported, and the cam I'm using is 799 lift and 288 duration on a 110 c/l running alky inj. and shifting a 4 spd at 7500 crossing the stripe at 7775. I want to know if its worth trading heads or not. will the big m's make more hp?
Them big m's are actually very good heads. I had them on my 548 everyone said they were way to big, so I swapped to dart 355's cnc'd and lost a few hundreths. They would be excellent on a 598
Kinda funny you said that hammertime. When I was building my 540 I found a set of Big M heads and I had two different builders tell me that they were too big and that they would be good for either a 572+ cu in motor or a smaller supercharged motor. I bought the Dart 355 cnc heads too, ran them two seasons, and then sold them. I was not happy with 355s at all.
Myself either, I thought they were a poor head for how much they are talked up. My big m's were took to a local head porter he really liked them on his flow bench, said they were one of the best conv heads he had seen (3-4 years ago)