i dont know dem, not as unreliable as you think, what i find surprising is that a lot TVR's for sale state just had engine re-build and some cars have only covered 20K miles.
Adam, TVR's own engine was basically a racing engine for the road and early ones were prone to going bang after very few miles ... Most have been sorted now and as time rolled on they got more reliable. Cerbs, Tuscans and early Tams were mainly hit where as T350 - Sag engine rebuilds are rare. You will see rebuilds advertised on the T350 but remember you all read about the ones that have them not the 100's that don't. This is nopo ordinary engine and unless you follow the warm up rules they are pretty much reliable....If you don't you will need to get you cheque book out.