1991 - 1993 # 630 or 7120 cylinder head from a 4.0 is the Puppy for your Litter. Brien. NEW YORK eagle registry #501 eagle kammback registry Date: Wed, 17 Aug 2005 14:17:22 -0400 From: farna@xxxxxxx Subject: Re: 4.0 iron exhaust on 199 [was: Best 4.0 combo] To: mail@xxxxxxxxxxxx Message-ID: <ADVANCES62ix4A2DreB000000f6@xxxxxxxxxxxxxxxxxxxxxxx> 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