Originally Posted by 19nova69
I never did anything with the motor. This is the way I got the car. It had a dirt track race motor in it with dart 200 heads, a victor jr and some crazy cam that only made power above 3k. I'm trying to tone it down and make it somewhat streetable. I honestly have no idea what CR I have we just made a guess that its somewhere around 10 or 11:1 based on compression numbers compared to other cars with similar readings.. It's gotten a whole lot better in the last couple days after the cam and intake swap and playing with timing.
If I understand you, you now don't know what the CR is at all- so it's safe to say it could be even higher than 10.5:1.
I don't know what of the advice you've received you've put into use, but the help from detonation will come from more octane, cooler intake air, slowing the advance curve (stiffer mechanical weight springs) and limiting the total timing to something the engine will tolerate (lower the total timing by where the distributor is set and by limiting/eliminating the vacuum advance.
You can richen the carb to help matters some, but there's a limit on this as well as the timing as to just how far you can go before you start to take away too much power from the engine, have problems w/running hot, etc..
Most any other improvement will come from changing hard parts in the engine, gearing will help some.
In my opinion, the thing to do would be to pull the heads off, measure things to know where you are and make your tuning decisions based on hard facts.
Like Cole says, JMO.