" From: Todd Tomason <jayscore@xxxxxxxxxxxxx> " " Anyone have any good information on adapting a 4.0 cylinder head to a 258? I " found an article by Tim Weaver on the web. Are there other sites I'm not " finding? have you looked at the strokers group on yahoo? they're primarily interested in the 4.0 but know a lot about other amc sixes. if you have a late 258 ['86/7-'90] the 4.0 head bolts right on. earlier ones need attention to disparate water-jacket holes. '81-5 use 7/16" head bolts but earlier and later use 1/2". ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought