I went with 9.7 cr. on my 512, I have made the mistake more than once trying to run more CR on the street,pump gas, here in HOT, almost sea level Southeast Tx, all is good..038ish quench
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
