Aye, the last engine I bought turned out to have a warped block so had to pull it out and rebuild it with a replacement, but that's not what Martyn's on about, I made some mistakes and was a bit unlucky building a ca18de for me zx and ended up doing 3 partial rebuilds then 1 full rebuild, car ran fine 4 2500miles inc 170miles on Mallory, a trip to and a few laps of the 'ring then 5 laps of Cadwell before the bottom end decided they'd had enough after massive borewash, the fuel pump I'd fitted was wrong....there now you know feel free to join in the fun :doh::lol: