Justdave, Last Fall I broke down a TR3A engine with about 75K original miles and found the original Hepolite 83 mm pistons were grossly worn. You could almost put 2 rings in some of the ring grooves and the skirts were sort of "see through". I suppose that this engine may have been abused during it's short run but on the other hand the crank journals, bearings and cam were nearly all perfect. The point I'm making is; inspect your pistons very closely. I looked at all of the options for dealing with the worn liners and bad pistons. Buying new oversized pistons and getting the liners bored out was my first thought but the cost of the machining plus the piston kit worked out to nearly exactly the same as just buying a complete new (87 mm) piston and liner kit, imagine that. I called all around the country getting prices to bore the wet liners and got about the same price everywhere. I couldn't find an AE brand liner and piston kit (couple of years too late) so I reluctantly ordered the "County" brand kit (from Moss) expecting to be disappointed and return it for a refund. When it arrived it looked OK to me but when I took all the engine parts to my machinist for balancing he was very impressed with the "County" piston and liner kit. For one thing the piston's weights varied less than 1/2 a gram. He suggested that the pistons were "Mahle" reproductions and pointed out some details on them indicative of quality crafting (notwithstanding where they were made). They're in the engine now and I'll be running it up soon. Be reserved about replacing all the bolts and studs and things. Most of that stuff really will work just fine, in spite of all the warnings in the service manuals and such. Just check that the studs don't have any apparent damage and you can run a nut up and down the clean and oiled threads with your fingers. Don't overlook putting new wrist pin bushings in the rods if needed. They need to be a pretty precise fit on the (wrist pin) and mine were a little loose. They have to be precision honed by a machinist after being pressed in. My guy installed and honed them for $8.00 each (I provided the bushings). Good luck, C. Myles.