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I'm anticipating an exhaust manifold turning out a stud with the nut. I know there's a coolant passage behind it (right?), but my question is: does the level go down when the engines not running, like a radiator?

Hey guys, something I don’t understand. A 493 has, I think, a 6.76 rod & the block needs some minor notching. Yet a 512 has a 7.1 rod(?) & slips in without modification?