I bought a couple of 340 engines one has been modified and I can't figure what is causing the problem basically the valve spring retainer is contacting the valve guide at full lift. It has cracked a retainer and the multi groove valve locks are breaking of at the grooves (the engine has pieces of broken valve locks through out). It has std push rods, rockers and hyd lifters I don't know the cam specs or history of the engine. The block has been o'ringed but has std pistons and was assembled with normal Felpro head gaskets which I thought was strange (should have high comp pistons and copper gaskets to warrant being o'ringed) any ideas?
