BB casting number - where are they?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72 longhorn BB · 12-07-2005, 01:50 PM

About BB casting numbers:

1.) where are they

2.) how do you read them to tell if the block is numbers matching to the VIN of the truck it is in?

Thanks

jsbgump · 12-07-2005, 02:56 PM

block castings are on the back of the block behind the distributer. same as a smallblock

**clay68c10** · 12-07-2005, 03:04 PM

There is also a stamped # at the front passenger deck surface, just in front of the cyl head. That's the one with the model and hp rating codes.

Dean · 12-07-2005, 04:33 PM

Date code is on the side of the block I believe.

franko72 · 12-07-2005, 09:07 PM

clay6810 has right answer. I found info for my 402 BB on the front passenger deck ledge on the block just in front of the cylinder head

Purs · 12-07-2005, 09:40 PM

Here is a good diagram and explanation:

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

12-07-2005, 01:50 PM	#1
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	BB casting number - where are they?? About BB casting numbers: 1.) where are they 2.) how do you read them to tell if the block is numbers matching to the VIN of the truck it is in? Thanks __________________ Chuck 1972 C-20 Longhorn 402 BB .030" over (409?), curved HEI, RV cam, quadrajet, dual 3" exhaust, TH 400 ported w/shift kit 1999 K1500 Suburban (old style) 5.7L Vortec 4L60E "No matter where you go, ........ there you are" Last edited by 72 longhorn BB; 12-07-2005 at 01:50 PM.

12-07-2005, 02:56 PM	#2
jsbgump Gone Fishing Join Date: Aug 2005 Location: Fort Worth, Texas 76135 Posts: 12,361	Re: BB casting number - where are they?? block castings are on the back of the block behind the distributer. same as a smallblock __________________ 68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616

12-07-2005, 03:04 PM	#3
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,969	Re: BB casting number - where are they?? There is also a stamped # at the front passenger deck surface, just in front of the cyl head. That's the one with the model and hp rating codes. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

12-07-2005, 04:33 PM	#4
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	Re: BB casting number - where are they?? Date code is on the side of the block I believe.

12-07-2005, 09:07 PM	#5
franko72 Franko72 Join Date: May 2004 Location: Cincinnati,Ohio Posts: 471	Re: BB casting number - where are they?? clay6810 has right answer. I found info for my 402 BB on the front passenger deck ledge on the block just in front of the cylinder head __________________ 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust

12-07-2005, 09:40 PM	#6
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	Re: BB casting number - where are they?? Here is a good diagram and explanation: http://www.mortec.com/location.htm __________________ "Experience is what you get when you didn't get what you wanted."



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