Quote:

Hi all the 360 Im building will have 9.4 to 1 mechanical, and I will be running a comp cams xe268. The heads are regular open chamber small block heads the chambers deburred and some polishing. I have been told it might have too much cranking compression to run on pump gas!!??

If so do you guys think that the comp xe274 would be a better choice to bleed of some cylinder pressure?
Thanks



You should be fine with the comp XE268 cam.
The cam (if installed per spec) closes the intake valve 60 degrees after bottom dead center (ABDC.)
If you plug the info into the Wallace Racing Calculator for Dynamic compression/cranking pressure you get 146 cranking PSI at your altitude of 1,241 feet. Even at sea-level (0 Feet altitude) the cranking pressure would only be around 153 PSI.

Links:
http://www.wallaceracing.com/dynamic-cr.php
http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=627&sb=0