<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">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.<div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div><br class=""><div class="">On Jan 29, 2021, at 7:07 PM, Brian Schirano <<a href="mailto:bschirano1@gmail.com" class="">bschirano1@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">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<div class="">Cheers</div><div class="">Brian</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 29, 2021 at 2:34 PM Scott Janzen via Fot <<a href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;" class="">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.<div class=""><br class=""></div><div class="">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).</div><div class=""><br class=""></div><div class="">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?</div><div class=""><br class=""></div><div class="">Or, do I need to find another block?</div><div class=""><br class=""></div><div class="">Scott Janzen</div></div>_______________________________________________<br class="">
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</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="gmail_signature"><div dir="ltr" class="">Brian Schirano<div class="">585-305-0349</div></div></div>
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