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1951 John Deere A engine stuck -- first start after new

Brian 1951 JD A, gas. Disassembled engine, had block bored .125 over, new aluminum pistons. Crank and main bearings checked within limits and no damage, head reworked by machine shop. New guides and new intake valves, reassembled engine per manual, used plastigauge, checked and double checked, my first total rebuild. Spun engine with no plugs, have oil pressure, oil at rockers and governer, would spin great. Got it to fire, then removed plugs, spun again, everything looked good. Filled bowl with fuel, ran about ten seconds, when it stopped, engine was stuck, TIGHT! Will not budge even with bar and cheater. Opened panel on top of case forward of pedestal, no obvious anything, can feel cylider walls have oil on them. #2 piston can feel a little play at wrist pin when wiggling connecting rod. #1 doesn't have any play. Removed bolts from governer housing and lifted to clear cam gear, not the problem. Removed rocker assembly, valves stayed in place so at least not broke off at stem. I suspect broken valve in #1 but do not want to go further without some insight from the knowledgeable ones. Is removing the head next? What is the likely problem?
Brian Spun the #1 connecting rod bearing, scored crank. Guess I'll take it apart again
bontai Joe Any progress?

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