Re: 1974 - 232

[farna@xxxxxxx]

On May 12, 2005 andrew hay wrote:

> 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.

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! Rods are the same until the deck height change, then there is a change in length. I don't have notes as to what the lengths are though. 

> 
> " 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.

The only problem with the early 2V intake is it's set up for a Carter WCD, which has a "close in" bolt pattern -- BBD carb is wider. So none of the Weber or Holley replacement carbs will bolt to the early 2V intake. 

> 
> 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.

I know several people who run 4.0L exhaust manifolds on late 70s/early 80s 258s. There is a port mis-match, but apparently the manifold flows so much better that there is no noticeable power loss. The slight gain may just be in the better exhaust system total, as all I know put in 2" or 2.25" exhaust and turbo muffler (one a free flow cat) along with it. I suspect no gain from the manifold alone because of the port mis-match, but no loss either. The two piece iron manifold should be the same at worst. 

> ________________________________________________________________________
> Andrew Hay                                  the genius nature
> internet rambler                            is to see what all have seen
> 
> adh@xxxxxxxxxxxxxxxxx                       and think what none thought
> 
> 
> 
> .


=============================================================
Posted by wixList Archiver -- http://www.amxfiles.com/wixlist