1991 Chevy big block need info - The 1947 - Present Chevrolet & GMC Truck Message Board Network

extd56 · 02-16-2007, 12:26 AM

I was running the numbers on the motor that I got out of a 1991 Suburban and the number was 10114182. I ran the number and it shows that it is a 1992 454 4 bolt main tall block. What kind of horsepower did this motor run and what is the differnece between a regular block and a tall block? Thanks

**Bob B.** · 02-16-2007, 04:45 AM

Those were 210-230 h.p. stock. Tall block means exactly that- the block is a bit taller than a standard passenger car/light truck block. This was done to accommodate a 4 ring piston. They also use a slightly wider intake manifold. It's a heavy truck engine for C-65's and Topkicks.

Bob Moore · 02-16-2007, 02:14 PM

I know anything is possible but I don't think GM ever put a Tall Deck in a suburban. If it is a tall deck it must have been switched. If the intake is off the tall deck, try a "normal" intake manifold - it should not fit. You can buy a spacer set to use a normal manifold or buy a tall manifold. About the only aftermarket tall deck manifold is a Team G(Weiand) square port.

The spacer set is an aluminum piece about 1/2inch thick that fits between the heads and the manifold. There are 4 pieces in the set. 2 long pieces and 2 short end pieces. I don't know if the spacers are available for anything but square port heads.

Hope this helps - Bob

**CMars45000** · 02-16-2007, 04:30 PM

Yeah, the original TBI 454's were kind of lethargic but still a great torque motor. I have 1992 TBI 454 out of a K3500 truck that currently resides in my K5. My block was a GenV. I think 1992 was the first year of the Gen V so maybe you could have a Gen V or a MKIV. All the GENV motors were 4-bolt mains and 1-piece rear main seals. THe MKIV was a 2-pc rear main seal and could be either a 4-bolt or 2 bolt block. There are WAY more choices for heads on the MKIV then the GENV. My 454 also had some peanut port heads (truck style heads) which are great for torque but not for much else...GenV's also had a "Net Zero Lash" rocker setup (I think that is what it was called) that basically meant that it had non-adjustable rockers...You just torqued them down and ran it...

02-16-2007, 12:26 AM	#1
extd56 Senior Member Join Date: Nov 2004 Location: Vacaville, CA Posts: 2,272	1991 Chevy big block need info I was running the numbers on the motor that I got out of a 1991 Suburban and the number was 10114182. I ran the number and it shows that it is a 1992 454 4 bolt main tall block. What kind of horsepower did this motor run and what is the differnece between a regular block and a tall block? Thanks Last edited by extd56; 02-16-2007 at 02:28 PM.

02-16-2007, 04:45 AM	#2
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,316	Re: 1991 Chevy big block need info Those were 210-230 h.p. stock. Tall block means exactly that- the block is a bit taller than a standard passenger car/light truck block. This was done to accommodate a 4 ring piston. They also use a slightly wider intake manifold. It's a heavy truck engine for C-65's and Topkicks. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

02-16-2007, 02:14 PM	#3
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	Re: 1991 Chevy big block need info I know anything is possible but I don't think GM ever put a Tall Deck in a suburban. If it is a tall deck it must have been switched. If the intake is off the tall deck, try a "normal" intake manifold - it should not fit. You can buy a spacer set to use a normal manifold or buy a tall manifold. About the only aftermarket tall deck manifold is a Team G(Weiand) square port. The spacer set is an aluminum piece about 1/2inch thick that fits between the heads and the manifold. There are 4 pieces in the set. 2 long pieces and 2 short end pieces. I don't know if the spacers are available for anything but square port heads. Hope this helps - Bob __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

02-16-2007, 04:30 PM	#4
CMars45000 Registered User Join Date: Jul 2006 Location: Pittsburgh, PA Posts: 204	Re: 1991 Chevy big block need info Yeah, the original TBI 454's were kind of lethargic but still a great torque motor. I have 1992 TBI 454 out of a K3500 truck that currently resides in my K5. My block was a GenV. I think 1992 was the first year of the Gen V so maybe you could have a Gen V or a MKIV. All the GENV motors were 4-bolt mains and 1-piece rear main seals. THe MKIV was a 2-pc rear main seal and could be either a 4-bolt or 2 bolt block. There are WAY more choices for heads on the MKIV then the GENV. My 454 also had some peanut port heads (truck style heads) which are great for torque but not for much else...GenV's also had a "Net Zero Lash" rocker setup (I think that is what it was called) that basically meant that it had non-adjustable rockers...You just torqued them down and ran it... __________________ Project Family Values Build Thread Vehicles/Projects: -1971 C10 SWB Fleetside! Gathering parts now, will begin frame-off resto soon... Pleasure in the job puts perfection in the work. -Aristotle



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