Steve:
They will interchange, but the compression will be practically
non-existent unless you mill the head extensively to reduce the size of
the compression chamber. The GT6 head has the smallest combustion
chamber because it is a 2 liter engine instead of a 2.5 liter.
Early GT6s had a 9.5:1 compression, the last GT6s had 9.0:1 I
believe, although the North American models may have been lower. Compare
that to the late TR6 engines which were 7.75:1 and had larger
displacement to boot, and you can see that the stock TR6 chamber size is
waaaaay too large for a GT6 motor.
A late TR6 chamber is approx 58cc (allowing 3cc for the head
gasket). That will give a 6.5:1 compression ratio on a GT6 motor. Yawn.
To get the later TR6 head to 9.0:1 on a GT6 motor, will require milling
off enough to get you to 42cc including head gasket. This would be
approximately 0.280" milled off, which is a very large number indeed.
The head can go that far, but your machinist will have the men in white
coats with butterfly nets visiting you.
Since this is a whopping amount to mill off, you should cc your
chambers and verify the numbers I mention here, since they are back of
the envelope calculations, I can't do math, never trust information you
get on the internet, yada, yada, yada....
Cheers,
Vance
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of steve bridge
Sent: August 26, 2006 9:06 AM
To: 6pack@autox.team.net
Subject: Do late TR6 heads interchange with all GT6's?
I looked in the archives, but I couldn't find any info.
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