I hope someone can help me out with this dilemma. I have recently purchased a 350, 4 bolt main from a friend of mine for a good price. He had over 2700 invested in the block, I know it does not seem like much to alot of you but it is substantial to alot of us. Anyway here is the dillemma. I know the heads are out of a 283. But I cannot find out any info from the numbers on the head, these numbers are 333832. Could it be that they are out of a larger chev vehicle, say a dump truck? Could someone help me out?