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GT6 cylinder head questions

To: spitfires@autox.team.net
Subject: GT6 cylinder head questions
From: Dave Fain <kc3565l@sprintmail.com>
Date: Fri, 5 Dec 2003 10:50:02 -0700 (GMT-07:00)
I am starting to clean up the ports on the head from my GT6 project car.  I 
already knew that the 
engine was a mixed bag of parts because it has an early Plus block (KD53420E), 
one piston with a 
part number that doesn't match the other 5 and 3 rods marked #4.  It is getting 
new pistons and 
will get balanced before it's assembled.  The head also seems to have come from 
somewhere or 
other.  My parts book shows that a Plus engine should have part number 517609 
or 517610 head.
Mine is clearly marked 517528.  Can somebody tell me what it is?  Later GT6's 
were supposed to 
have heads with larger combustion chambers and used domed pistons.  My engine 
has flat top 
pistons and the combustion chambers don't seem to be much larger than on a MkI 
head.  Could 
this possibly be from a TR6 or TR250?

Also, what thickness should I mill the head to to end up with around 10:1 
compression?  I will 
be running headers and a Kent road cam and the car lives above 5000' so I can 
get away with a 
little extra compression.
Thanks,
Dave




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