OH 350 4 bolt main block

[rsmarr1982]

Originally Posted by J kippin

it should have a 3 or 4 digit code on the back of the block near the cast number or the right side of the bell housing area. It will be a letter to designate the month next will be the day and the last year cast. It may also have a circle with a arrow in the middle showing the time of day and shift it was cast.
I wont to be sure it is a 71 or earlier block. most blocks are cast a few months before production but a few earlier ones have been used.
The stamped numbers don't mean a whole lot to me.. other than it may show as a truck block. If this was a Corvette I would want a numbers stamped block. Most of the time the numbers are milled during decking, or it may be a replacement. I have found the numbers at the 12 o clock position above the timing cover.

Is a pre 71 block that much different ? The only number possible to see when its in a truck is the casting id
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