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A couple of things to check before you run the engine and hopefully before it's back into the chassis.
What were the dimensions of the cylinders especially at the top. Ovality (lack of) is very important here. As is the piston OD and the resulting clearances?
Ring tension, did you happen to measure this in case your were supplied low tension rings?
Were the cylinders reconditioned and what was the final surface finish? Now is the time to be sure about everything, so if this tendency continues after some running, you can eliminate these factors.
For those that have not considered this, a cylinder leak down can be done without the heads installed. Lock the engine with that piston at TDC, or slightly below and do the same test. It requires a plate with an O ring to be made and bolted down to the cylinder top. We do this each time especially on the newer water engines where installing the pistons with very thin oil rails is somewhat blind.
There is a company that sells german tooling and a similar plate I think.
Now is the time to be sure and eliminate any doubts.
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