comp 20-249-4, 306/306 260/260 .555"/.555" in at 107*. blueprinted to 11.5:1 with quench. 4.56 rear gear and 28" tire. 1.75" headers and 2.5" dual exhaust. 195 cranking psi, AVS carb, exhaust crossover blocked ld340. will ping for a second at low rpms until the revs come up if I am in too low of a trans gear, no vacuum advance
Interesting... that combo comes up with a DCR of 7.95; I sure would not expect 195 psi cranking; more like 160. Buuuuut, I am sure that could be a bit higher with a large lash setting and the resulting shortened duration.
Your low RPM, high load knocking sounds like my '76 Dart Lite LOL
Edit to add: You sure the cam is not jumped a tooth advanced? I imagine not but if it was, then it would get to 190 psi cranking with your cam, etc.....
