Crank Journal Size: Mopar Versus Chevy

YO7_A66 said

I just got off of the Molnar web page:

4.00” stroke w/Chevy 2.100” rod pins

4.00” stroke w/Standard Mopar sb 2.125” rod pins

Both in stock and both at the same price and I will buy the rods as a matched set, and they are in stock too.

This is what started my question as to which one and why.


Thanks again!

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You buy the Chevy sized stuff because you can buy any bearing you want.

Chrysler used those big assed bearings because of Walter P.’s time at GM. I think he was in charge of Buick and they used those big bearings. Look at a Buick and a Chrysler and you can see they are cousins.

There is no reason to buy Chrysler sized stuff when you are doing what you are doing.

When I do my next engines it’s getting chevy rod throws and any decent crank grinder can widen the journal and not jack it up.

If you go back to the Pro Stock Truck days and Comp Eliminator today (ASScar too) you‘ll see they are using 2.00 chevy sized throws and I think IIRC 302 Ford mains. Most are running a 1.88 rod throw (Honda) because it makes the bearing lighter, the big end of the rod lighter and you can make the crank lighter.

Do the chevy sizes. No reason.