bbc in med duty trucks ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sweetk30 · 03-21-2020, 06:18 PM

so over on another board we got a question going . did they ever do 454 std or tall deck factory in c40-up trucks ?

i have always read its a nope and now this flyer popped up from one of the guys showing a gas v-8 7.4L engine .

for square body and older stuff only .

**CarolinaHD** · 03-21-2020, 06:56 PM

Got a 99 gmc c5500 with a 454

**Pvmt-Pndr** · 03-21-2020, 07:28 PM

To my knowledge there was never a 454 tall deck. Only 366 and 427s

sweetk30 · 03-21-2020, 07:30 PM

Quote:

Originally Posted by CarolinaHD

Got a 99 gmc c5500 with a 454

to new . sorry should have said square body or older only .

b454rat · 03-21-2020, 07:42 PM

I think on mortec.com they did list a tall deck 454. If you think there isn't much difference, and of course blocks are the same.

b454rat · 03-21-2020, 07:44 PM

10134366...454T..............4-bolt, Bowtie, Gen.V, Tall deck

14044807...454T..............4-bolt, Bowtie, MkIV, CNC prep, Tall deck, 4.25" bore or 4.495" bores

don't think last one counts lol. and first one is late 90s?

**Pvmt-Pndr** · 03-21-2020, 08:42 PM

I stand corrected and learned something new. Thanks

**Bob B.** · 03-24-2020, 01:53 AM

For a few years, starting in 1979, GM did offer a 454 in the C-65/6500 series. Not sure if it was a tall deck or not. There were later Mark V/VI tall deck 7.4L's, and the 8.1L's were all tall deck.

**special-K** · 03-25-2020, 05:56 AM

You ask about BBC but then it seems you are only talking about the 454. There were certainly BBCs in medium duties ever since there have been BBCs. I don't know what years, if not all years, but there certainly were 454s put in medium duty squarebodies. So the argument is about 454, right? Because we all know the 366 was a medium duty-only BBC

95 S_Trucker · 03-25-2020, 08:00 AM

Quote:

Originally Posted by Bob B.

For a few years, starting in 1979, GM did offer a 454 in the C-65/6500 series. Not sure if it was a tall deck or not. There were later Mark V/VI tall deck 7.4L's, and the 8.1L's were all tall deck.

The L21(98-00 medium duty specific)454/7.4 was a standard deck engine(also Gen VI). All of the L18(01+)496/8.1 engines were tall deck.

**Bob B.** · 03-26-2020, 12:34 AM

Quote:

Originally Posted by 95 S_Trucker

The L21(98-00 medium duty specific)454/7.4 was a standard deck engine(also Gen VI). All of the L18(01+)496/8.1 engines were tall deck.

That makes sense because I think the medium duty L21 used the same intake manifold as the light duty L19 7.4L.

95 S_Trucker · 03-26-2020, 04:55 AM

It would be the same intake as the L29. The L19 was TBI.

**Bob B.** · 03-26-2020, 05:27 PM

Quote:

Originally Posted by 95 S_Trucker

It would be the same intake as the L29. The L19 was TBI.

You are right, typo!

BTW- didn't the L21 have distributor-less ignition?

95 S_Trucker · 03-26-2020, 07:41 PM

Yes. It had a big camshaft position sensor where the distributor would be. It had a drive by wire throttle body, and each cylinder had its own ignition coil.

factorystock · 03-26-2020, 08:11 PM

Quote:

Originally Posted by 95 S_Trucker

All of the L18(01+)496/8.1 engines were tall deck.

Do these newer 01+ tall deck engines come with timing gears or timing chains? The old 366 and 427 tall decks had timing gears.

95 S_Trucker · 03-26-2020, 09:05 PM

Quote:

Originally Posted by factorystock

Do these newer 01+ tall deck engines come with timing gears or timing chains? The old 366 and 427 tall decks had timing gears.

Yes. They have chains.

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03-21-2020, 06:18 PM	#1
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	bbc in med duty trucks ? so over on another board we got a question going . did they ever do 454 std or tall deck factory in c40-up trucks ? i have always read its a nope and now this flyer popped up from one of the guys showing a gas v-8 7.4L engine . for square body and older stuff only . Attached Images __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. Last edited by sweetk30; 03-21-2020 at 07:31 PM.

03-21-2020, 06:56 PM	#2
CarolinaHD Moderator Join Date: Aug 2017 Location: Cabarrus Posts: 418	Re: bbc in med duty trucks ? Got a 99 gmc c5500 with a 454 __________________ Alex 1967 C50 292ci Lumber truck 1967 C50 292ci Dump truck 1967 C60 366ci Fire truck

03-21-2020, 07:28 PM	#3
Pvmt-Pndr Registered User Join Date: Jun 2017 Location: Temperance Michigan Posts: 375	Re: bbc in med duty trucks ? To my knowledge there was never a 454 tall deck. Only 366 and 427s

03-21-2020, 07:42 PM	#5
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: bbc in med duty trucks ? I think on mortec.com they did list a tall deck 454. If you think there isn't much difference, and of course blocks are the same.

03-21-2020, 07:44 PM	#6
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: bbc in med duty trucks ? 10134366...454T..............4-bolt, Bowtie, Gen.V, Tall deck 14044807...454T..............4-bolt, Bowtie, MkIV, CNC prep, Tall deck, 4.25" bore or 4.495" bores don't think last one counts lol. and first one is late 90s?

03-21-2020, 08:42 PM	#7
Pvmt-Pndr Registered User Join Date: Jun 2017 Location: Temperance Michigan Posts: 375	Re: bbc in med duty trucks ? I stand corrected and learned something new. Thanks

03-24-2020, 01:53 AM	#8
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,369	Re: bbc in med duty trucks ? For a few years, starting in 1979, GM did offer a 454 in the C-65/6500 series. Not sure if it was a tall deck or not. There were later Mark V/VI tall deck 7.4L's, and the 8.1L's were all tall deck. __________________ 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.

03-25-2020, 05:56 AM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: bbc in med duty trucks ? You ask about BBC but then it seems you are only talking about the 454. There were certainly BBCs in medium duties ever since there have been BBCs. I don't know what years, if not all years, but there certainly were 454s put in medium duty squarebodies. So the argument is about 454, right? Because we all know the 366 was a medium duty-only BBC __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

03-26-2020, 04:55 AM	#12
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,187	Re: bbc in med duty trucks ? It would be the same intake as the L29. The L19 was TBI.

03-26-2020, 07:41 PM	#14
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,187	Re: bbc in med duty trucks ? Yes. It had a big camshaft position sensor where the distributor would be. It had a drive by wire throttle body, and each cylinder had its own ignition coil.



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