" From: imfatdad@xxxxxxxxx " " Forgive my ignorance... what diff between the AMC/Iron Duke?? Any " interchange between or completely different?? Thanks in advance. complete. the alts probably interchange... the iron puke is a mongrel descendant of the '60s chevy four, itself 2/3 of a 230 six, and bits of buick like the very small bearings... the amc is a 4-cyl derivative of the amc six; the 4.0 took the ground it broke and applied it back to the six. the iron puke still has a sbc chev bellhousing pattern, thus encouraging jeepers to swap chevy v8s... oddly, the amc 150 has a chev 2.8/3.1/3.4 v6 pattern, probably anticipating cherokee use alongside the little v6. btw that chevy four is still in production in mexico, in a 181-cube version, for marine and industrial uses. the 140-hp 181 has long been popular in sterndrives. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought