BBC identification help needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dreamtruckproject · 01-12-2010, 07:29 PM

I bought a 454 BBC recently and am having problems with identification. Can anyone help.

Casting number:3999289
Per Mortec:
3999289....454.......71-79...2 or 4 bolt, some "CE" replacement blocks had four bolt main caps

The stamping on the front pad is: T01231SK

I can not find any info on the 1SK suffix code (yes it is clearly marked 1SK). Can anyone tell me what this origionally came in, power rating etc?

TheDark1 · 01-12-2010, 09:59 PM

The only thing I can think of is that the "1" was a "T" and the top didn't show up. TSK is a '77 Truck with 250 HP or a '75 truck with 215 HP. I trust your eyes since I can't see it. If it's a "1" then I don't know. Sorry, I looked for about an hour and my eyes hurt now. Jeff.

dreamtruckproject · 01-12-2010, 10:39 PM

Nope it is clearly a 1, has the little tail at the top. I found a suffix code ISK but it is for a 396 which would have a different casting number. I am stumped.

NF65Fleetside · 01-14-2010, 10:01 PM

Well a search on the casting number shows that its a 454 for sure....and all show that its a mid 70's engine. I think that for the stamping number it must be the assembly number from the Tonawanda(sp) Plant. Build that sucker and lay some rubber!

01-12-2010, 07:29 PM	#1
dreamtruckproject Registered User Join Date: Apr 2008 Location: Lubbock, TX Posts: 46	BBC identification help needed I bought a 454 BBC recently and am having problems with identification. Can anyone help. Casting number:3999289 Per Mortec: 3999289....454.......71-79...2 or 4 bolt, some "CE" replacement blocks had four bolt main caps The stamping on the front pad is: T01231SK I can not find any info on the 1SK suffix code (yes it is clearly marked 1SK). Can anyone tell me what this origionally came in, power rating etc? __________________ 63 Chevy short step

01-12-2010, 09:59 PM	#2
TheDark1 Intentionally Left Blank Join Date: Dec 2008 Location: Broussard, LA Posts: 355	Re: BBC identification help needed The only thing I can think of is that the "1" was a "T" and the top didn't show up. TSK is a '77 Truck with 250 HP or a '75 truck with 215 HP. I trust your eyes since I can't see it. If it's a "1" then I don't know. Sorry, I looked for about an hour and my eyes hurt now. Jeff. __________________ 1965 C-10 Short Fleet 468/TKO 5-Speed 2004 2500HD Crew 496/Ally Blacked Out (SOLD!!) 1997 Formula WS6 2004 Jeep Wrangler (Sold) 2013 Jeep Wrangler (Sold) 2017 Jeep Wrangler (Blacked Out on 35's) 2011 GMC D-Max Dually Denali 3500HD (Sold) 2015 GMC D-Max Dually Denali 3500HD (Sold) 2018 GMC D-Max Dually Denali 3500HD (Sold) 2020 D-Max Dually Denali on 33x12.50's 1979 GMC Short Bed Step-Side 4x4 350/350 Low Miles

01-12-2010, 10:39 PM	#3
dreamtruckproject Registered User Join Date: Apr 2008 Location: Lubbock, TX Posts: 46	Re: BBC identification help needed Nope it is clearly a 1, has the little tail at the top. I found a suffix code ISK but it is for a 396 which would have a different casting number. I am stumped. __________________ 63 Chevy short step

01-14-2010, 10:01 PM	#4
NF65Fleetside Registered User Join Date: Feb 2007 Location: Los Angeles Posts: 674	Re: BBC identification help needed Well a search on the casting number shows that its a 454 for sure....and all show that its a mid 70's engine. I think that for the stamping number it must be the assembly number from the Tonawanda(sp) Plant. Build that sucker and lay some rubber!



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