" From: Tom Jennings <tomj@xxxxxxx> " " " GIven a stock 70 head etc, are there combustion chamber issues " to watch for? I don't think I've been able to run as much ign " advance as I should without pinging, so I may have squish area " AFU (it's got 199 or is it 290 flat-top pistons in it). both the '68-'70 199 and 4bbl 290 had flattops. i think with a '70 head you have no squish, as up until the 4.0 the only closed-chamber 199/232/258 head was the original '64-7 with 56cc. '68-'76 heads had an open 64cc chamber. '77-'80 heads were 74cc... ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list