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Bringing back this thread as I finally got the time to disassemble the motor. Low and behold, cylinder 1's rod is severely bent (maybe others too, hard to know for sure).
Take a look at this thread where I am asking if this looks safe to use the block/pistons. https://www.miataturbo.net/engine-pe...1/#post1606936 I noted a bit of wear where the crank counterweight rubbed a bit on the backside of the piston. I am unsure if that makes the crank/pistons unusable or that is not a big deal. I am planning on adding Manley Forged Rods on this block or another block.