Mass produced parts can have machining faults.
Your extra effort has paid off for you.
I've never used any thing but new heads on new cylinders and I've trusted
them to be correct. I'm assuming that they were but as I stated I always
see some drip or cylinder head discoloration after about 10K on air
cooled engines.
If you ever get into a cylinder head rebuilders cores ........ take a
good look at the Air Cooled heads coming in. I've simply never seen air
cooled heads that didn't display some leaking after heavy use.
I'd be interested in seeing if your lapping procedure for double
precision would eliminate this.

Stan Wilder

On Sun, 23 Mar 2003 19:48:39 -0800 phil cain <bearsvw2000@YAHOO.COM>
writes:
> I most likley am overstating it about lapping in the
> cylinders but the only one I ever had leak was the one
> that I didn't do, and it was new heads and cylinders,
> and brave me skipped the pressure test on compleation
> of assy because I thought it couldn't be bad because
> all of it was new. Well thats my story and I'm
> sticking to it. Phil
>
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