To Add to Vance's post...
The early GT6 heads had different studs or I should
say, I have a MKIII GT6 head on our MKI GT6. The
holes for the studs in the block had to be bored out
for larger studs. So, it would be helpful for you to
use a early head if you have an early GT6 Block from a
cost standpoint. Of course the early heads aren't
that easy to come by. Where are you? I have a couple
of MKII parts cars that have complete engines.
Cheers,
Todd Bermudez
CD198L
CF25768UO
--- "Navarrette, Vance" <vance.navarrette@intel.com>
wrote:
> 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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