" From: Tom Jennings <tomj@xxxxxxx> " " " " " " THe 4.0 EFI swap is well known. Except for headbolt size issues " which might require a stepped washer set to adapt, it's what " people on this list call "bolt on" -- but I don't. THere's a " lot of detail involved (like post-1980 heads DO NOT CLEAR THE " FIREWALL ON PRE-1973 GREMLIN/HORNET!) and a crapload of wiring. the head bolt issue only affects '81-6 258s; all earlier and later sixes including 4.0s and 232s have 1/2" bolts. there's another problem though; '87-up blocks are wider, and 4.0 water passages don't all line up with earlier openings. this can be creatively worked around but it does take a little work. you can do the efi with or without the 4.0 head. mopar's kit for the 4.2 [258] uses a 4.0 intake with new dowel pin notches/holes. if/when the 232 needs a rebuild, i believe '77-9 232/258 pistons would give you a little compression boost - i can't find data but infer their dish is 6cc smaller than '68-'76. if you can find them, late '60s 199 'flattops' would give you more, maybe needing premium gas. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list