Hi,
I have a 1969 Daytona Yellow/Black Z28 DZ 302. My question is the block casting # is 3932388. Now I looked this # up and it gives me two motors for the same number, 302 Z28, and a 350 used in other cars. Is this correct? How would I know which is which? Do I have a correct motor car? Please let me know if you hve any insight. Thanks. Eric

 

My book shows 3932388 to be a 69-73 350. It could be a 2 bolt or a 4 bolt. Good luck finding more info.

H.

 

My understanding is that a 69 302c.i. is in fact a 350 block with a 283 crank. I believe GM found that the 350 was stronger(?) than the 327 block. Anyway, with that in mind, that block could have been used in 302 or 350 applications. The key is the #'s stamp on the front pad.

 

It's not unusual for the same casting number to be used for different engines. The bore and journal sizes can vary. I have a 67 SS350 that has the same casting number as the 327 and 302 motors.

 

I should have added that the 327 and 302s I was talking about were 67s also.

Try checking the two letter code at the end of the assembly date stamped on the block. If it's there and readable that should tell you plenty. Your 69 Z28 would obviously be the DZ code.

Chevrolet By The Numbers lists that block as being used for both the 302 and 350 in 1969. And both were 4 both mains. Apparently that casting number wasn't used much. 386 was much more common.

 

to know if its the org. block that came with the car there should be two sets of numbers stamped on the front pad by the waterpump on the right side, one set will have the last 6 digits of the vin # , if it matches your last 6 numbers of the vin on the dash then its the right one, but if it dont and you dont have a DZ stamped on the pad it doesnt mean its not a 302, as the service replacement blocks were not stamped DZ, and we all know that a lot of them were ran hard and a few blew up and were replaced
here are a few sites that explain what all the numbers on the block, head, and crank mean
http://www.mortec.com/castnum.htm
http://www.nastyz28.com/sbchevy/sblock.html#camaro
http://www.camaros.org/index.shtml
http://www.chevy-camaro.com/

 

in 67 is when Chevy put the 283 crank into a 327 block to make the 302, as they both were small journal cranks, the 350 was a large journal crank and block in 67, in68 & 69 Chevy made the 302 crank just for the 302 it was not a 283 crank. the302, 327 and 350 used the same block

and has anyone ever wondered why they made the 307 it was because they had 283 blocks and 327 cranks left from making the 302 and that made 307 cid

 

read this about the 388 casting block
http://www.chevy-camaro.com/faq/chev...q-3932388.shtm