Rob,
Does the crankshaft rotate ? Give us the details again.
When my old engine seized, I pulled both heads off and also pulled the cylinders about half way over the pistons, not completely off. this allowed me to move each rod on the crank and it turned out that #3 rod bearing on the crank had seized.
I then put it back togeather and its been sitting on my workbench ever since !
Hope this helps.
Sandeep
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