<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 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></body></html>