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There are no castings that were used exclusively for 4 bolt main applications.

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Q: What block numbers should be on a Chevy 350 with four bolt mains?
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Unfortunately, if the mains are shot you probably need to have the crank turned. Just replacing the mains will not really solve any problems.

Is the serial number for a Chevy 350 engine 3858180?

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Do 1978 Chevy C-10 trucks have 4-bolt mains?

hard to say. you can get the block number and check it. it may tell you if its 4 bolt. chances are its not though. aside from that you would have to remove the oil pan to tell.

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