I think I'm missing a nut.

RustyRatRod said

Literally tens of millions of slant sixes never had one. Unless you plan on sustained high RPM, it's totally unnecessary. IF you want to add one for convenience of turning the engine, OR if you plan on racing, or both, then by all means.

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Thanks, Rusty. I'm going to install one so I can turn the engine. What size bolt is this? My other 225 has one but I can't tell what size it is. Has a large hex head on it. Any suggestions? Should I use one from a junkyard, or will a generic off-the-shelf bolt do?