AL1968

Can some decode 4 bolt chevy casting# 3935439 Suffix T06252BN What is BN.

restoman1

Double check that suffix. You have one too many numbers in the date.

T0625 ?BN

Ed

AL1968

I checked 3935439 is casting# T06252BN is suffix

restoman1

Well, you got me. 2BN isn't anything I have in any of my books.

Ed

VonB

1969 = #3935439 427 cui 390, 400, 430 & 435 Horsepower (early)
T=Tonawanda 06=the month (JUNE) and 25 = 25th day
2BN i have no idea should be LM, LL, LQ or LN

VonB

AL1968

Could this be a marine Boat block ( Chris Craft ) ? Casting numbers are 1968-69 corvette
I found out last night.

restoman1

I don't see that one listed for marine applications, although it "could" be agricultural (my books don't list those).

The 3935439 block was used in late 68 and early 69 for Corvette and full size passenger cars, as well as trucks, marine and agricultural. Possibly other things, but I don't know.

Ed

Mike Ward

As you've guess, 2BN is a marine application. GM made umptysquillion of them with hundreds of different three character suffixes- one numeral followed by two alpha.

AL1968

If this is a marine block, can it be used for 1968 corvette engine build ?
Is block the same as car block ? Are you sure that this is a marine block ?

Mike Ward

The blocks are all the same- it's what gets added to them makes them a marine engine or not.

AL1968

Thanks All, you have been a big help. If any new information come up
concerning this block let me know. Thanks.