How To Figure Compression Ratio

If you’re going to replace the heads/cam then use the published specs from the stroker kit and NEW heads to come up with a ballpark compression ratio for the new combo. Don’t worry too much about the CR of the old combo because you’re changing it. Who cares what it is now? With 93 octane and aluminum heads you could run up near 11:1 maybe a bit more if you are confident in your tuning skills.