What is the upper limit of compression ratios on street builds you have done with a small cam? 87 or 93? Custom tune or stock ECM? Steel or aluminum heads? Stock stroke or stroker?

I am considering building a dual fuel motor to run primarily CNG which is 125-130 octane, and want to push the limit on the compression I could get by with when forced to switch back to pump swill.

Last edited by mgoblue9798; 06/27/22 04:04 PM.