[tmareina]

Mine is a 428 solid roller cam, pretty radical with eddlebrock heads and 11.4-1 compression. 38 degree advance. It does not ping on Chevron or Shell 91 pump gas...however I put 5 gal. of 100LL av. gas in it (18 gal. tank) or a bottle of Lucas Racing octaine boost when I can't get av. gas. It does run better with Av. gas added. I do live at about 3700 feet altitude also...that probably makes a difference too. The engine idles at 1100 at altitude and about 1200 in Sacramento. The exhaust is medium+ gray so it's not running too rich.

Tom