NOS 350 4-bolt main block
 

Friend of mine posted this over on Moparts:
Casting at rear of block 3970010
Tag wired to block 3970013
Number on outside of crate 3970016

Numbers stamped on front of block CE3943 or GE3943 9 4
and raised at the rear of block 083

http://board.moparts.org/ubbthreads/...ml#Post2470713

Probably D83 casting. Would work for a 70 or 71 Z warranty replacement. Did he list a price?
Buddy

Get a better picture of the date cast on the rear bell housing flange (passenger side) as that's when the block was made. Sounds like it might be 0 B 3 which is likely 1970 - February - 3rd. Also see if it has a small thread in plug in the front of the block just above the timing cover.

The stamp on the front pad is CE394394 and this is a counter exchange stamping used as a GM warranty block. No one knows why they stamped the codes with the spacing on the last 2 characters but that's the way they were stamped. Blocks were built in large batches for warranty use and that's what the CE designates. The first number after the CE corresponds with the year it was issued under warranty. That being said it appears to be issued as a warranty block in 1973 and could have been for a Vette, P/U Truck, Camaro or just about anything in the 300hp range. Also see what numbers are cast on the main caps since your friend stated it was a 4 bolt main block.

If he can take better pics of the casting numbers, front of the block and the bottom caps he can email them to me at oldgasoline101 at gmail.com. If it's an NOS Flint block with standard bore in good condition (meaning no rust or pitting in the bores and build-able as is) then it's likely worth a grand or so to someone looking for a warranty coded block from that period.

Cheers

400-500 range

083 is probably D83. http://www.camaros.org/numbers.shtml...ernalDateCodes
It was built in 73, so that matches.

The number that matters here is the part #, 3970016.
Google shows that it's a bare 4" block, no pistons or crank. Should be all ready to go if there are no rust issues.

That's easy. They did that so they wouldn't have to keep changing the gang stamp.