For a slant six to be mounted on an engine stand.
Anyone know the size?

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"Ja, Ich fahre ein altes auto."
'78 Volare 225
'67 Charger 318

3/8 UNC

Use caution as motor is extreamly unbalanced I ended up with the 2 legged stand with support rods down to stand legs

I would recommend a few buddies there when you want to rotate the motor

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1963 Plymouth Valiant Wagon

I use grade 8 bolts and those even get bent some. I use a Harbor Freight engine stand, it seems plenty strong enough. I did use a longer pipe handle to make rotating the engine easier for one person, my handle is about 3 feet long (the one that comes with it is only maybe 18" long or so,way too short for much leverage).

Brian

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https://tinyurl.com/yynpj4v2

Size will be dependent on what holes in the block you use... I typically set the prong up to use 2 of the upper bolt holes into the block, and the outboard arms through the lower holes/ears on the tombstone, which would require a longer bolt with nuts and washers at both ends...you can adjust the center of the prong to have a better center and balance for the engine... at least until the head and manifold are on it...

You should use a washer at the head of the bolts and they will take the load of the engine better, I have yet to bend a grade bolt...

I have 3 harbor freight engine stands that I bought back in the 90's and they originally held mid-70's 400 big blocks....make sure to use a 4 wheel stand not the 3 wheel...