Dcr

Thank you, Moper. I appreciate the considered and thorough reply. I tend to want engines with a low end torque that is greater than is needed for best ET's in the 1/4 miles, and so like to push CR and limit duration for that end. But that runs straight towards detonation territory, so I am very interested in all things related to that. We are pretty much at your last combo with AL heads in our 340 build BTW.... so good to see that..... .040" quench but a little less DCR.

But I also don't push the limits; on the street and driving 10's of kmiles, I don't need to be worrying about detonation late at night with bad gas. And when rallying, it sucks to have to walk 12 miles out of some remote forest after midnight if your motor expires! BTDT.....