[urq] Cylinder Head Q [LONG]
Andrew Finney
afinn1 at gmail.com
Mon Feb 28 18:12:15 EST 2005
SNIP>>>>>>>>>>>>>>>..
You may want to take some time and look through the archives from ....let's
think here.....spring/early summer 2001. I went through to hell and back
having my head re-done. Here's what I know (or think I know)
I'm not the expert on warped heads and such - but I'd guess a simple
re-surface would fix any warpage and you can re-install. I don't recall if
you recently had the valves done - so if not I would take the opportunity to
go ahead and do that. As for the EM - while it's off, and it's been heat
cycled - I'd have its mating surface flattened too - local machinist here
charges $45. But assuming its just a little warped - I think I'd just have
it resurfaced and call it good. I probably should have done that years ago
when I did my 10V rebuild - I got scared off by some warpage and the EM
mounting face needing a good amount of flattening - and went on a
country-wide seach for a head....
If you choose to replace the head - probably the first thing you need to
find is a head that pressure tests OK. I went through I think 3 heads
before finding one that pressure tested ok. As Jim said KH head is good
replacement - (this is what I did) - no mods needs. It is the exact same
casting as WX but has hydraulic lifters. So I don't believe it flows any
better than WX. As for hydraulic lifters - unless you're going to track it
and plan to rev it past 7000 they are fine. Being a hydraulic lifter head -
WX cam will not work. KH cam reportedly sucks. I never even tried it - I
had my WX solid lifter cam reground by Delta to 268/270 specs - about as
aggressive as you can get and still pass emissions here on our rolling dynos
in CO - for the hydraulic lifter KH head. If emissions don't matter - I
think some people like the characteristics of the 272. Somewhat lumpy idle
but great top end to match the K26.
Now - a little more involved option would be an MC head. If I were to
replace a head I think I would go this route. It does have better flow
characteristics than the WX/KH. But it does require that an oil galley (I
think) be welded shut. Keith Anderson I believe, knows how/what to do - as
do others I'm sure. And it would come with a good cam - unlike the KH.
but I bet your head is fine - just get it resurfaced.....and do the EM too.
anyway hth
Brandon
'84 ur
SNIP>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.
If you're going to go to all that trouble you should use the head out
of the last normally aspirated 5000 with the big intake valves and
swap in the sodium-filled exhaust valves. I bought one from Force5,
had them do all the seals and exhaust studs. The intake valves are
much larger than the WX ones. That's what I did. HTH.
Andrew Finney
1983 and 1984 UrQs.
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