Could the plug thread be longer than the plug-hole thread? If so the
exposed turns could fill up with hard crud that effectively 'taps' a little
more out of the head. Could just be an aluminium 'shine' on the crud rather
than significant material transfer.
PaulH.
----- Original Message -----
From: Dave Wood <djw69@idt.net>
To: MGB <mgs@autox.team.net>
Sent: Tuesday, May 23, 2000 6:30 PM
Subject: Aluminum heads
> ... The most difficult one had
> aluminum in the bottom two or three threads. Does the aluminum melt into
> the plugs or what?
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