If you're trying to run 48 degrees of advance in that engine,there's your problem right there. Try to pull it back to somewhere around 36-38,total. Clint Hooper H&H Custom,owner LT5 Registry Director http://www.LT5Registry.net/ ACES #1650 http://dalesplace.com/misc/friends/clint_hooper.htm ----- Original Message ----- From: "Brian Zack" <[EMAIL PROTECTED]>
This engine has the stock cast 76cc heads with the ports lightly smoothed out and your basic felpro head gaskets. I am running the flat top cast pistons. This engine has just under 20K miles on it. I think it is detonation I'm hearing. I seem to be able to hear it now with my flowmaster exhaust. (It seems I can kinda hear it through the exhaust). I am planning for and trying to save up for some s/r torquers and a bigger cam for hopefully next spring. I'm planning on the comp cams xe262. The cam I have now is the crane energizer cam w/ .440 lift and I think its 260 duration I'm not sure of the @ .050 dur. When I built the engine, I didn't measure how far down the bore the pistons are. At that time, I didn't know anything about the DCR and I asked for 9:1 pistons and don't know if these pistons were manufactured a little further down than desirable or not. I can only guess at my measurements. Right now, What I can figure from my guesses is my DCR is around 7.4:1 to 7.5:1. When I was considering heads for the future, it was either the vortecs or the world s/r torquers, but, I think the vortecs would make me have to run a lot more expensive fuel because of going to a DCR of around 8.5:1. The total advance of 26 you have doesn't include how much advandce the weights and springs add. I'll have to check how much those add, but from memory, I think total was around 48 degrees. Brian Zack '70 Chevelle Malibu mailto:[EMAIL PROTECTED]
