Self inflicted wound
In a recent thread, the board correctly diagnosed my problem (one of my problems) as a malfunctioning exhaust valve. I found a bent push-rod with the rocker off of the valve (#5 exhaust). After pulling the intake and measuring clearances, I determined that the length of the intake bolts (1.25" with a lock washer) could NOT be the reason. The scars in the inside of the bend had to be caused by something other than the intake bolt. Then I remembered that in the previous installation of the intake manifold (R&R'd to fix an oil leak) I had chased the threads in the head overhang to remove the liquid teflon that I use to prevent seepage up the intake bolts. I must have run the chase too deep and scarred/cut the push-rod. After it ran a while, the weak spot caused by the scar/cut gave way, the rod bent, the rocker slipped off of the valve stim, and the valve became in-operative. Clem would have never done that.
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