the metal head gasket wasn't sealing ,you could see dark spots going past sealing ring area between cylinders. when i did the leak down test all plugs were out when I tested #6 cylinder air was leaking out #5and4 the rockerarm shaft was off so all valves were closed,pulled head apart all valves looked great no pitting,I think this is why it wouldn't idle, firing more then one cylinder at a time,the enging ran smother with #456 pulled off!
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