Nah, get a 4.0L head -- ANY year is better than the 199-258 heads. The specs for the 4.0L and late 258 (81-89?) combustion chamber size is 64.45-67.45 cc. On August 17, 2005 andrew hay wrote: > i guess if i was gonna get serious about this, i'd hunt up a late > ['72-4] shaft rocker head or just swap over to a bridged-rocker one. > both have smaller ports than the '60s head that flow better; iirc the > main change is the port floors. all heads '68-'76 have 66cc chambers; > '64-7 are 56cc, '77-'80 are 74cc. > > team it with an '80s water heated intake and mopar holley 2280 [bbd > replacement]... > ________________________________________________________________________ > Andrew Hay the genius nature > internet rambler is to see what all have seen > > adh@xxxxxxxxxxxxxxxxx and think what none thought ============================================================= Posted by wixList Archiver -- http://www.amxfiles.com/wixlist