Its the engine builder .... 4 engines ?? NO WAY ... I have put them together in my garage and never had that kind of failure. If they are totally being torn down and it keeps happening...bent valves ??? The valves are sticking in the guides .... either they are too tight or the plugs are too hot.... not enough cooling in the heads ... gaskets ?? No way troubleshoot this over the E NET. have to see the engine. Sorry I dont believe 4 engines. Not possible after the second I would ahve gone to another BUILDER.
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