3963512 block and crank

[racerkvn]

I was going through some old parts that I'm thinking about getting rid of and uncovered a block I've had for about 20 some odd years that I picked up to build one day and never did. It's block casting 3963512 it's an original 4 bolt main block with the original forged crank in it. The stamping indicates it as a replacement/warranty engine with CE958724 and it's never been decked. I figure a Corvette guy or a Chevelle guy might need this thing more than me.

Can somebody help me decipher the stamping code so if I do decide to sell it I know how to list it as? What's it worth?

[Stefano]

The casting date will be important to buyers as will the crank.

454 vs 427 Crank are different and a 512 block could pertain to either.

The CE9 in my opinion is Chevrolet Engine 1969. So if that holds the carnk should be number 6223 or the 7115 which was more rare. 454 forged crank is 7416 casting.

[racerkvn]

Thanks for the info, much appreciated! I will go back out there and measure the bore size and get the crank number in a few weeks and report back. Can you tell me where to look for the date code? Or any other info? I figured the 9 meant 1969 but being a warranty/replacement motor I've ran into dead ends trying to run down the stamping.

When I got it I wasn't too interested in the numbers, I was going to build it as a spare motor for my race car at the time, I sold the car and this block/crank been sitting in storage ever since.

[Stefano]

There are two possible locations for the casting date. Early 512s have the casting date on the passenger side of the block, by the freeze plug until approx March or April. After that it was moved to the bellhousing flange.

[SS69chevelle]

check where the starter bolts on and you will find the assembly month and year, example T049 would be April 69.

[racerkvn]

I haven't been able to check this block and crank out yet been busier than expected this holiday season. After the first of the year I'm going to drop the block and crank off at my local engine shop and have them dip/clean/magnaflux the block and also check the crank out. Once I get the word on the condition, I'll post here about it.