Re: 258 head on a 232

[adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)]

" From: <mail@xxxxxxxxxxxx>
" 
" Is there any advantage to putting a late model 258
" head on a 72 or later 232 block? There is a lot of
" chatter about the 4.0s but I have this good 258 head
" and a 72 232 that needs a valve job.....Russ

nope.  year-for-year, 232 and 258 heads and pistons are the same.
worse for you, through '76 the heads had 66cc chambers but for '77-80
and probably '81 they were 74cc.  some time in '81-2 the chambers
shrank [from 8:1 to 8.6:1 cr], and iirc later in the '80s shrank again
[to 9.2:1 iirc].  but the '80s are either the lightweight design with
7/16" head bolts [not a big problem] or 4.0-style 'wide block' design
with water passages that don't line up with earlier blocks.  afaik
ports are all the same.

late '70s slugs have shallower dishes to go with the bigger chambers
and in that '72 would give you a mild compression boost.
for a 258, the taller '80s slugs would be best i think.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen

adh@xxxxxxxxxxxxxxxxx                       and think what none thought