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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,878 Posts
Welcome to Allpar. Possibly rusted cylinder walls? This could be exacerbated by a damp environment. Proper storage would have been a shot of motor oil in each spark plug hole before sitting.
A boroscope (auto parts store tool loan?) could take a look through the spark plg hole.
 

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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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23,878 Posts
Is it possible that a valve is stuck rusted open? This could stop a piston as it approached TDC in either direction.
 
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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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23,878 Posts
If a torque converter bolt has backed itself out, it can hit the back of the block.
 
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