there are a few people I wish I could meet on this thread,mostly when a problem like yours comes up. It would be nice to come over and check the mill out. Then there is grizz, mark massive mods god I would love to work for him for a month just to learn. and racer 22[he's from my home state]. Any way I put together one of my 7 ports off of ebay. And what I noticed was it felt sloopy. and it is the one engine that I noticed the pinch was going away a little faster then the others. I may have done the massive mods run in oil a little to much? If thats possible. Not enough heat?It went together hard,meaning the sleeve did not want to slide down into the block easy. This was the engine that made the wisp,wisp noise. come to find out it was the clutch springs[to lite,90's] I'm wondering if your onto some thing here when the engines get rebuilt. This engine has about a gallon on it so I have another one to go until I tear apart and rebuild. Or I may let this one go a little longer. If you stumble across what the problem is please share. I would like to know.