Well I had a set of Wiseco domed pistons that had 25 cc domes. The head was milled so that the chambers were around 65 cc's. Giving a couple of cc's for the head gasket. I had close to 42 cc chambers. That put the compression right at 14 to one. I also had the timing set to 35 degrees total advance at 4000 rpm. I usually ran it to 7500 rpms before letting off. I had dual Dellorto carbs and that was a fun dirt track car to run. I wish I had the carb set for the Supra, 3 side draft carbs!!! Oh yeah. I had to sell the Celica though, they dropped the class at the end of last year. I sure do miss it.
Russ
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