Re: 1974 - 232

[adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)]

" From: farna@xxxxxxx
" 
" 
" 3. Port size changed over the years. Early heads have biggest ports, but
" the 91-05 4.0L HO head has the highest flowing ports even though they
" are some of the smallest. Has to do with port shape -- a more gradual
" curve in this case that leads to higher velocity. 87-90 is a close
" second. 

but for adaptation to a '64-'70 ['low deck'] motor there's the pushrod
length issue.  a '72-4 shaft head would be a positive swap though
probably not worth much effort; the '72-up 232/258 ports are smaller
than '64-'71 but flow better, primarily from raised floors iirc.
chamber size was 66cc from '68 to '76 but you'd lose compression over
the 56cc head on a '64-'7 six.  those were closed chambers too,
working well with flattop pistons.

" 4. Manifolds generally interchange as long as both are kept together
" (intake and exhaust). Not that you have a choice -- the intake and
" exhaust manifolds bolt together through mid 1980.

and btw the '76 and later 2bbl are the best of the stock intakes.  the
earlier 2bbl would probably be second.

i'm wondering if the '99-up 4.0 iron split exhaust manifolds would fit
any of the 199/232/258 heads...  i know that 4.0 has the tiniest ports
of all.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen

adh@xxxxxxxxxxxxxxxxx                       and think what none thought