Hi guys, just reading through some old articles on this site about 400s
and came across a link to this buildup ;
http://www.tmeyerinc.com/400Ford.htm
I note that he has a 32cc ROUND dish with tight quench heads. My 400
was similar except the dish was only 17.8cc and my 4V heads had
slightly larger chambers and it was a pile of ****, and completely
immune to all attempts to tune it.
That site talks about the great quench with zero deck (mine was only
0.010" so not far off) but when you think about it isn't half the
quench ruined by this huge dish overlapping much of the chamber in two
places?
I read an article on the Keith Black site which claimed that screwing
quench in this way resulted in erratic power per cylinder and like mine
the engine became immune to tuning - I adjusted my timing 20 degrees
and the g-tech still said the same miserable 270bhp or so net, ditto
with the carb, from 780 vac sec to 750dp, lean to rich, I tried
everything in huge doses, and it made no difference it was crazy, never
met an engine like it and I have to put it down to this, there's no
explanation left.
I'm starting to suspect that the most critical part of building a 400
is to float on a set of KB148 351C pistons - which I've recently bought
- having a 13cc dish EXACTLY the shape of a 4V chamber and building it
close to zero deck. In my case I'll end up at 10.8:1 which is perfect
for New Zealand's gas.
Has anyone here done something like this or have any experience with
round dishes and quench chambers? I'd love to know if this is going to
make the difference I'm hoping for.
I ended up selling all the EFI setup, but still have my almost complete
intake, weiand xcelerator 351C-4V with ****ted weiand spacer plates
welded to it with kinsler injector bungs welded through both, angled
and aimed at the valves as per the 5.0. Will finish the manifold one
day and maybe have another crack at injecting it, I needed cash and
couldn't see myself fini****ng it anytime soon as the motor's stripped
down to fit the KB148s when I finally get somewhere to do it.
Thanks guys!
Geoff (aka Kiwi, still alive, still lurking from time to time!)
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