Quote:
Originally Posted by BILT4ME
The casting numbers on the engine blocks will tell the tale. If the older one ends in 0010 it will be a 350 4-bolt main 1970. Casting number on left top side of bell housing mount at the end of the left head.
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0010 or 3970010 blocks came in 2 or 4 bolt mains.
Even motors that came in trucks , that should be 4 bolt, had 2 bolts.
It seems that later on GM put in what ever they had on hand?
I pulled a 0010 motor out of a 1969 Chevy c30 openroad motor home and it had a 4 bolt and a steel crank.
I pulled a 0010 motor out of a 1973 c-10 and it was a 2 bolt.