" From: farna@xxxxxxx " " " The 232 and 258 used dished pistons, the 199 flat tops. I was going to " suggest using 199 pistons if swapping on the head with bigger chambers, " but if the engine is being rebuilt just buy the same year pistons! another idea - the '77-'80 six had bigger chambers and smaller dishes. you could pick up a bit o' compression with those slugs on a '68-'76 232/258. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought