Heat treatments ...

[steveb@falcon.kla-tencor.com (Steven Buchholz)]

> >    made flat again and (d) $150 in misc hardware and gaskets.  You can
> >    console yourself with the fact that your manifold is now
> >    heat-treated and won't warp again.
> 
> 	I had my N/A I-5 done a few years ago and after reading this, I am
> wondering if my "manifold is now heat-treated and won't warp again"
> also(assuming it was "sent to the machine shop") or is this a procedure
> that varies from shop to shop, and were all manifolds heat-treated 3
> years ago or is it a relatively new procedure?
> 
... it was not something that was done when the EM was machined ... he 
was referring to the fact that the EM had been heat treated every time 
it was driven ...

That has been my feeling as well ... the casting has a bit of stress in 
it from manufacture, which is releived when the EM is heated ... and 
I've seen how hot it gets on an urQ!  I had my EM resurfaced back in 
'86 and haven't heard a tick since ... of course solid lifters and no 
vacuum pump help there too ;-)

Steve Buchholz
s_buchho@kla.com
San Jose, CA (USA)