You may also look and see what APT offers, one thing abuot them is either they offer new cam blank or regrinds, but everything is ion nitrited for proper hardness, and now APT has the Triumph .800" 60 Rockwell C rated lifters, the .800" lifter work in almost all the Triumph engine, except the early 1147s.
Maybe one of you can answer this for me. When I build a 1500 engines, which like the TR6 rides the cam directly on the block, I use a Spitfire 1300 camshaft and then install 1300 cam bearing in the 1500 block, which requires no block mods, because all the factory did with the 1500 engine is increase the cam journal size on the cam to work in the block without cam bearing, obviously a cost saving deal for the factory. Knowing the cam journal size of the TR6 cam is the same as the 1500, I've often wondered if it is possible to turn down the cam journal diameter on a TR6 (this could be easily done on crankshaft grinder) to that of a 1300 Spit cam and then use those cam bearings in a TR6, anyone ever heard of this? I'm rebuilding a TR6 engine, or more like fixing what another bulder missed, and I think I have some 1300 cam bearing lying around, so I might look into this, not for this engine but for future reference. Since so many things is simular for the 1500 to the TR^, this could be a easy way to put cam bearings in a TR6.