bbc casting number on block, please help me [Archive]

robertstell

12-26-2009, 07:05 AM

I have what i beleive is a 427 tall block with the casting number 861959, and a little ways toward the top of the block are the letters GM 10 T . Can anyone confirm this being a talldeck block...thanks alot, Rob...

DirkaDirka

12-26-2009, 07:37 AM

Are you sure that the casting number is not 361959 instead of 861959??

I found that the 361959 is a 454 block that was used in the 73-75 Chevelle--73-76 Passanger car I believe--and the 75-85 Truck LD.

fla1976

12-26-2009, 07:39 AM

Are you sure it isn't 361959? If it is, it is a 454 between 73-90.

http://www.mortec.com/bbc.htm

Beat me again Dirka!!

robertstell

12-26-2009, 08:04 AM

The first number was a 3 instead of an 8, can you tell me if it is a tall deck? Thanks alot, Rob. Toward the center of the block is alo has GM 10 T. I need to order a distributor for it and want to make sure I get the correct length.

cam67152

12-26-2009, 08:50 AM

its a 454 from 1973-90 could be a 2-bolt or 4-bolt, all 454's are 9.8" deck height, (except bowties).

cam6752

oldandtired

12-26-2009, 08:50 AM

Buy a distributor with a slip collar and you won't have to worry about it.
Dave

cam67152

12-26-2009, 08:55 AM

I believe T stands for the Tonawanda assembly factory, not Truck.
cam67152

zipper06

12-26-2009, 10:11 AM

Quick and easy check, look at the front of the block where the water pump mounts, if the top of the water pump mounting surface is within 3/16" from the deck it's a short deck 9.8. If the mounting flange is about 7/16" to the deck it's a 10.2
No matter what the casting #'s are.

Zip.

itsabird

12-26-2009, 11:59 AM

Quick and easy check, look at the front of the block where the water pump mounts, if the top of the water pump mounting surface is within 3/16" from the deck it's a short deck 9.8. If the mounting flange is about 7/16" to the deck it's a 10.2
No matter what the casting #'s are.

Zip.x2