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
Thanks Frank. I am also putting in a litter bigger cam and I also upgraded my out of the box 1050 and bought a new carb from Pro Systems 1250. Also, I am adding a vacuum pump. My first thought was to angle mill the heads and tighten up the chambers from 118 to 107. But if I angle mill the heads I am wondering about piston to valve clearnance, the angle and also if I have to cut the pistons since these pistons were not made for angle milled heads. Wouldn't I have balance the assembly again if I had to cut on the pistons? The guy that built this motor originally told me that they are JE pistons with a 40 cc dome, but the pistons say SRP on them. The only SRP piston that I can find with my crank and rods says it is 12.8 w/a 36 cc dome.