Re: [AMC-list] 195.6 ohv head --> ribbons

[adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)]

" From: tom jennings <tomj@xxxxxxx>
" 
" Last week at work I chopped that bad cyl head into slices. these heads are
" getting scarce, but this one had four cracks in four cylinders, so sfe to
" say it's unsuitable for repair. I had it hot-tanked and media blasted before
" crack-checking, so it's nice and clean for photos.
" 
" []
" 
" The exhaust ports are fairly square. Not that it matters much at these flow
" rates, but it would be easy to improve, and the metal is plenty thick. I may
" remove the big lumps and smooth and polish the exhaust ports on my "turbo"
" head, to minimise heat retention more than anything.

if you have enough of the head left to experiment with, you could try
a trick an engine builder friend came up with: hog the #### out of the
ports until they're -way- too big to be any good, then fill them back
in with plasticine and flow test them.  rearrange and repeat as
necessary.

when you get the perfect shape, copy it into a usable head.  cnc would
help...	;^>

i have heard of tack-welding inserts into exhaust ports to fill
too-big spots in.  you can fill with welding rod, but afaik [not much]
the only rod that matches cast iron thermal expansion is nickel steel,
#### hard to port afterward, and you need to get the head good and hot
before and after welding so it doesn't thermal-stress crack or warp.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh@xxxxxxxxxxxxxxxxx                       and think what none thought
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