Help with part numbers?

[Richard P.]

I have block 3959532, 2x4 intake 3739653, rear end 3725899, what are these from?
Thanks.

[Tom D.]

Date codes on part numbers?

Date codes (cast) on these parts would narrow it down. I don't see the block in Colvin's books.

The intake would be for 60-61 Corvette 245 or 270 HP.

[Joe L.]

Re: Help with part numbers?

Rick-----

I can find no block of that casting number. If the number is actually "3956632, then it's a 1969 307 block.

The GM #3725899 differential housing was used for passenger car and Corvettes with non-posi rear ends from 1957 through 1964.

[Ralph E.]

Re: Help with part numbers?

Block is for a 1956-1967 283CI