<VV> Loud noise when hot

[Vairjer at cs.com]

snip> It presently develops a loud noise, more like a screech than a knock, 
when it gets up to temperature. It seems to develop good power otherwise. Since 
the sound seems to come from the right side I pulled the right head today and 
can find nothing wrong except for one cracked exhaust donut. <<

If you haven't found it yet, verify that all of the pushrods are "right side 
up", i.e. with the oiling hole visible near the rocker...I have found that 
some folks will put all or some of them in the wrong way, and it produces an "at 
temperature" shrill squeaking that is otherwise hard to figure out...also kind 
of hard on valve guides, rocker surfaces, etc....My 65 A/C car was that way 
when I bought it...PO had a local mechanic put Viton O rings in, but the guy 
didn't know which way the pushrod went, but was 100% consistently 
wrong...Literal little old lady who drove the car only drove it one mile at a time down to 
the courthouse and back in the evening, so she never had a problem...I 
discovered it on my first trip out of town to a chapter meeting in Hickory, NC....made 
it home cringing as I listened to the shrill squeaks, but no serious damage 
was done...simply polished the valve stems with "crocus cloth" and reassembled 
the head, and installed all pushrods the correct way.    20,000 miles later, I 
did a valve job with new guides.

Jerry McKenzie