A lot less milling if you slip a set of flat top 199 pistons in there first! I think we spec'd out about 10.5-1 with the 199 flattops and a 4.0L head in basically stock heights. I believe you can use a chevy 250 six piston in a 4.0L block to get around the 11 or 12-1 range too. Again, not positive of the exact needs to accomplish this. But heard it is doable. -- Mark Price Morgantown, WV 1969 AMC Rambler, 4.0L, EFI, T-5 2004 Grand Cherokee Laredo, 4.7L, Quadratrac II " I realize that death is inevitable. I just don't want to be around when it happens! " -------------- Original message ---------------------- From: Brien Tourville <hh7x@xxxxxxxxxxxxx> > > LPG runs best with high compression - so - > a 4.0 7120 head to a stock '81 258 > would require roughly how much shaving > to accomplish 11 to 1 compression ? > > > T > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://splatter.wps.com/pipermail/amc-list/attachments/20081002/599d6eb9/attachm > ent.htm > _______________________________________________ > Amc-list mailing list > Amc-list@xxxxxxxxxxxx > http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list