Dan are you 100% sure the outside diameter of the CGT 535 cylinder sleeve is larger then the 500 sleeve ? After reading your above post I decided to order some CGT base gaskets for a GT project I will be working on shortly. According to Hitchcock's the same base gasket is used for all EFI engines including 535 CGT . Possibly the gasket has clearance around the 500 sleeve ?
I would say 95% Dale. It's been a while since I saw that GT case. But I just can't see how it can not be a wider OD on that GT Barrel then the 500. Beside the stuff I mentioned above. For one... that would leave damn near no meat left in the cylinder for over sized pistons in the future for service. Secondly... some of them GT Boys in that section, have been saying after they measured the cylinder ,and how they CAN bore it out to a 90 mm.
And yes... same part number for the base gaskets. However the OD of the 500 barrel measures at 92 mm, and the ID of the base gasket measures at 96 mm. So, that is how they are using the same gaskets on both bikes I believe. BUT, the part numbers for the left and right case half's of the 500 and GT's ARE different. And they ARE different from what I have seen..... very similar ! But different. If your going to have that GT top end apart Dale.... measure that sucker, and lets see what you get as far as the case opening size and OD of the barrel.
OK, when you pull a cylinder out, the bottom of it appears unsupported . Well... it CAN'T be unsupported like that ? Because the bottom of the cylinder would balloon out from running ! You'd wide up with a BIG tapper at the bottom of the cylinder with the piston going up and down in that area .......