Exhaust timing question for the gas motor guys.

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The last gizmo motor I had was acting the exact same way then it did this. Ended up being the upper rod bearing failing. I know you said the bearings where new and in good shape but figured I'd share in case it helps.
 

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The last gizmo motor I had was acting the exact same way then it did this. Ended up being the upper rod bearing failing. I know you said the bearings where new and in good shape but figured I'd share in case it helps.
That is from porting the transfers too thin. Follow the crack you will see places the metal wasn't .005" thick and a crack starts there and works it's way around.

See many dozens blown apart caused by a worthless cnc program that is destroying the cylinders needlessly.

You do not have to cut any of that so thin for any reason to get flow through the transfers.
 
Here’s the same thing but this was a dunked engine
 

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