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I just picked up a 80 350 4 bolt main block block measuring 4.030" dia. The thing that I'm confused about is that it has a journal dia of 2.650" Was this a 383 stroker?? Casting # 14010207
 

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That is what a 350 should be.

 

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Discussion Starter #5
Sorry! $50 to buy it was a great deal. $50 for the steel forged crank to go with it is even a better deal!
 

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Umm not sure where TJ got those numbers from, but ALL 350's had 2.45" mains.. Only the 400 went to 2.65... Although I guess its possible that someone line bored it out??..Ive never heard of it being done though.
 

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Umm not sure where TJ got those numbers from, but ALL 350's had 2.45" mains.. Only the 400 went to 2.65... Although I guess its possible that someone line bored it out??..Ive never heard of it being done though.
The numbers that I have shown are the diameters of the main crankshaft bore.
The numbers you have are crankshaft journal sizes.

Add a bearing to the crankshaft size, and you have the main bore size.

Which does he want ?

also, casting number 14010207 1980-85 350 - - 4bolt main from a truck or passenger car
 

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Umm not sure where TJ got those numbers from, but ALL 350's had 2.45" mains.. Only the 400 went to 2.65... Although I guess its possible that someone line bored it out??..Ive never heard of it being done though.
Boring a 350 main out to a 400 main will not work unless you want to cut into the main bolts!!!
 

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FWIW all '68-'69 327/307's used the medium journal cranks.
I don't understand why some internet car sites put up misleading info.
 
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