Rich in cylinders 1&2

[Jac Mac]

Its quite likely that the guide problem would be traced back to the valve spring issue.Once the springs broke they would no longer sit square in the heads/retainers which would create a side load on the guides/stems, plus IIRC you mentioned the spring problem may have been due to incorrect heat treat during manufacture which in itself may have caused the spring to distort under load prior to actual failure.

[Texasdoc]

Maybe. But I can't imagine all the springs were from the same batch. Maybe just the two that broke. I would imagine that they make the springs by the hundreds, if not thousands. One intake and one exhaust spring broke. The rest didn't. ALL 16 guides are worn. Seven out of eight (88%) if the intake valves have damage. None of the exhaust valves are damaged. One of the damaged springs was intake, one exhaust.

Maybe all the springs were over heat treated and made them brittle. Maybe that caused valvetrain problems that ruined all the guides. Why did it only damage intake valves? I don't know - I'm at a loss as to why or how.

Thanks for the input tho.