again 273 wanna hear your opinions ...

AJ/FormS said
In at split overlap(44*), for an ICA of 58*
Static compression ratio of 9.68:1.
Your dynamic compression ratio is 8.07:1 .
Your dynamic cranking pressure is 161.70 PSI.
V/P (Volume to Pressure Index) is 108...................... 108 ..
On the money Mike

In 4* advanced at 104*,for a ICA of 54*
Static compression ratio of 9.68:1.
Your dynamic compression ratio is 8.28:1 .
Your dynamic cranking pressure is 167.18 PSI.
V/P (Volume to Pressure Index) is 115...................... 115 ..
Probably too much for pump gas

Yes, I did advance it a couple degrees. I usually run 92 octane non alcohol Premium with no issues. I have ran 87 but I didn't hot rod it. The shop that did the heads polished the chambers which may help. Those closed chamber 273 heads are pretty efficient with a little work. Thanks for the update.