Mike Davis,
Definitely not hitting the breather. When we ran the motor last weekend, we pulled the breather off and the knocking noise was still present. We checked the breather early last year as well. We checked if the lifters were hitting the valley pan several times and that wasn't it. I'm pretty sure when Paul had the motor apart this last time, he would have looked for that. The rockers are not hitting the valve covers. We checked that that last year and Paul checked the clearance prior to even sending the motor the first time. That is why he suggested the thicker valve cover gaskets.
HWYSTR455,
No way to the breather. That was checked several times. I think all the easy diagnosing has been done. It's been 2 years and no matter what, the same knocking noise has been present. There was no way to hear the knocking noise while it was on the dyno in Arizona with no mufflers. This is becoming like Groundhog Day.
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