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Any other suggestions for freeing what I believe is a mildly stuck engine?

Thanks,

David

Here's an option that looks to be a good solution...Have'nt tried it yet but I will if need be... the old molasses trick..



That's messy , I tried it on some small stuff , I didn't see the part about heating the mixture so it didn't work that well , definitely not something to dry when it's HOT

Have you pulled the heads ? If the bores are heavily rusted it may not be worth the effort. I have a 400 block that I got unstuck , it needs 3 sleeves because of rust pitting , when I removed the heads my feet got wet .

I set the engine so one bank was pointing up with the heads off , filled the cylinders with PB blaster , a week each bank , then i put a long bar on the crank bolt and rapped the top of as many pistons as i could reach wit ha 2 lb brass hammer , and rocked the crank back and forth , took about an hour , spraying in more PB , finally got it to rotate over , in total the block needs 5 sleeves between pitting and core shift .

It makes a lovely door stop at the moment .