An out of balanced engine is like a shoping cart with a wobbly wheel. The crank is trying to shake around in the main bearings. Also be sure to balance the pressure plate, flywheel and damper. It will add many miles to the bearing life.
I can't believe you guys have this much time to worry about these things. Don't you cars need something done to them to improve them. Decide what you want to pay bid to that, win the item or leave. Your going to worry yourselfs to death...
If the pistons are used there might be a small burr at the snap ring groove. This is common with round snap rings. If they are new pistons that has new pins and the air tempature is cold try putting the pistons in hot water for a few minutes. If that does not work, then you will have to have a machine shop lightly hone the piston to .0003 to.0005 clearance.
I just did my rods. I have a Sunnen honing machine to do them on. They (Sunnen) call for .0003 to .0005 for a full floating pin of this size. You can not have .0000 clearance, it will be a press fit. Any good automotive machine shop will have this type of machine.
I just bought one on ebay. There is one listed now, not cheap, but there is one. Mine fits well and is NOS so the ad said, and appers to be so. BRASS Water Distribution TUBE in the search box should find it.
I have been a machinist for 51 years. 20 years in engine machine business. Last 15 making parts for collector cars. Retired now, still working some just to by parts for the 1948 Special Deluxe. ( It is just like the first car I owned )
Try this one, it also has a flathead engine. The reason that I knew is I have made parts for one of the five built. Not this one but a silver one that can be seen if you google Chryslar Thunderbolt.http://auto.ocregister.com/2010/02/12/attention-jay-leno-rare-41-chrysler-thunderbolt-for-sale/28601/
I was in the engine business for 25 years. You should be able to turn over a short block at 40 ft.lbs. or less. If a rope seal is used and installed correctly it is not much more drag than a rubber seal. You must soak the rope in oil and work the oil into the seal by hand to soften it. Install the seal in the groove and work it down into the groove with wood hammer handle or something round. Only after that cut off the excess with a new sharp razor blade.
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