Do I have a mercury crank?

[busmania]

Shortly after buying my car with a frozen FlatheadI found a Flathead on Craigslist for $100 so I bought it as a back up. When I showed up to pick it up, he also gave me some other parts. Notably 3 cranks. One has 3.75” written on it, one hd 4.0” and the last has nothing. Obviously I can’t trust what someone wrote on it but I’m hopi g the one that says 4” is a mercury crank. The shop I dropped my block off this week at said the only way to tell is the merc crank will have larger oil holes. Is this true? Here’s some photos. If it is a mercury crank and I decide to machine/use it, what else do I need to change to make it work? Is it worth using? As always, thanks for all your help!







https://www.fordbarn.com/forum/attac...4&d=1670626891