[Fot] GT6 vs TR6 blocks - interchangeability?

[Scott Janzen]

I know the differences are the head (deeper head/thus larger combustion chamber on the TR6 to be proportionate to increased stroke and keep compression ratio reasonable.

Rods are the same, crank is stroked to get to larger displacement, cylinders have the same bore, TR6 pistons have a “higher” wrist pin height equal to the amount of the increased throw, as the rods are the same.



On Jan 29, 2021, at 7:07 PM, Brian Schirano <bschirano1 at gmail.com> wrote:

The two GT6 blocks I've recently worked on have the notched bottom bores. I'd have to look Monday about the crank blow outs on the manifold side. I will defer to others with more knowledge as to GT/TR interchangeability, but my understanding is the differences were in the crank, pistons and intake manis, not the blocks
Cheers
Brian

On Fri, Jan 29, 2021 at 2:34 PM Scott Janzen via Fot <fot at autox.team.net <mailto:fot at autox.team.net>> wrote:
I am rebuilding my street TR6.  I need to replace the block - it’s sleeved, bored 30 over, and needs another bore, and I would rather just start over as it’s not original to the car anyway.  It’s a later block with the horizontal reinforcement cast into the manifold side, and the car is a 1970.

I have another block, allegedly from a GT6, has a KD number indicating GT6, but it has the concave/convex “blowouts” on the manifold side to clear a TR6 crank, which none of my other GT6 blocks have.  It’s also 25 lb heavier than a GT6 block, and has notches at the bottom of the piston bores to clear the con rods, which I’m pretty sure the GT6 blocks don’t have (though I don’t have a GT6 engine apart and apparently my memory is not that good).

So, here’s the question - can I use this for the TR6 - is it the same block where at some point the factory used them interchangeably?

Or, do I need to find another block?

Scott Janzen
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-- 
Brian Schirano
585-305-0349

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