Factory big block truck? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68 bigblock · 02-25-2007, 10:24 PM

The guy i bought my truck from said it was a factory big block truck,it has a 396 in it now but i just want to know for sure if i came factory with a big block in it.any help?68 short bed

Joe67 · 02-25-2007, 10:43 PM

My 72 chassis has factory dual exhaust brackets welded the frame, are those indicators of a BB truck?

1969k10stepside · 02-25-2007, 10:47 PM

There was 402s and 396s in some of these trucks originally (only 2wds though),it should be listed on the glovebox label,might be on emblems too.I dont think they came with BBCs in 67 though

**70cst** · 02-25-2007, 10:52 PM

I think 69 was avaliable with a 396 and 70 was a 402. I might be wrong.

As far as 68 I am not sure if a 396 was an option.

1969k10stepside · 02-25-2007, 10:53 PM

One of them years was a transition from "396" emblems to "402" It was right around 1970 or so..

**clay68c10** · 02-25-2007, 11:22 PM

68 was the first year for the BBC, only a 396 was available. They changed to the 402 later. The glovebox sticker or build sheet is the only way to be sure what the truck had originally.

**too much stuff** · 02-25-2007, 11:23 PM

I believe 68 and 69 had the 396. 68 would not have fender badges for it. 69 had 396 fender emblems. 70-72 had the 8-400 emblems (402) I think 67 was small block only trucks. or sixes...

**70cst** · 02-25-2007, 11:53 PM

My 70cst has the original 402BB.

**kwmech** · 02-26-2007, 12:10 AM

I have 2 1968s with factory 396s in them. One chevy and one GMC

Blue85 · 02-26-2007, 12:22 AM

shouldn't a big block truck have a high tranny hump too? Thats how i usually tell the difference

stsalvage · 02-26-2007, 12:38 AM

the 1964 chevy truck had the first big block it was a it was a tall deck and in 1966 was offered with a 396 long bed and high hump dose not matter if it was big block or small block can't understand why chevy had 2 humps me it would of been cheeper to just make one floor and make it easyer on us GM folks to want a 350 or 400 trans thats me

1969 GMC · 02-26-2007, 01:41 AM

Quote:

Originally Posted by stsalvage

the 1964 chevy truck had the first big block it was a it was a tall deck and in 1966 was offered with a 396 long bed and high hump dose not matter if it was big block or small block can't understand why chevy had 2 humps me it would of been cheeper to just make one floor and make it easyer on us GM folks to want a 350 or 400 trans thats me

I can't really understand what you just typed, but do you mean the bigger C40 and up trucks? The tall deck big blocks never came in light trucks or cars, and 68 was the first year for big block (396) in pickups.

ProStreet68SB · 02-26-2007, 08:50 AM

High humps didnt just come in big block trucks, iirc they also came in all 4x4's, and all 4speed trucks regardless of the motor.

**special-K** · 02-26-2007, 10:07 AM

Quote:

Originally Posted by too much stuff

I believe 68 and 69 had the 396. 68 would not have fender badges for it. 69 had 396 fender emblems. 70-72 had the 8-400 emblems (402) I think 67 was small block only trucks. or sixes...

This is all accurate info.But,I think`70s still had the 396 badge,even though it was a 402.396s stopped in`69,then 402.
The only factory dual exhaust came on big blocks.So,the factory brackets are a telltale.
High-hump/low-humps were related to trans options.Small with 3spd and TH350 in 2wd.High with 4spd,TH400 in 2wd.All 4wds are high-humps.All big block trucks had 4spds or TH400,so all big blocks had high-humps.Dig?

72k20+afew · 02-26-2007, 10:19 AM

Didn't the big block trucks have the newer stye motor mounts i know the one i have out back does and i looked it up and that was original for 71 gmcs

Blue85 · 02-26-2007, 11:24 AM

Quote:

Originally Posted by special-K

This is all accurate info.But,I think`70s still had the 396 badge,even though it was a 402.396s stopped in`69,then 402.
The only factory dual exhaust came on big blocks.So,the factory brackets are a telltale.
High-hump/low-humps were related to trans options.Small with 3spd and TH350 in 2wd.High with 4spd,TH400 in 2wd.All 4wds are high-humps.All big block trucks had 4spds or TH400,so all big blocks had high-humps.Dig?

1969 GMC · 02-26-2007, 01:11 PM

Quote:

Originally Posted by special-K

All big block trucks had 4spds or TH400,so all big blocks had high-humps.Dig?

I've seen 1 or 2 big block trucks with the 3 on the tree. Don't remember what hump they had, though.

Huck · 02-26-2007, 01:17 PM

didn't the BB trucks also have the heat shield mounted to the lower firewall above the pass side exhaust --? Was that all years (68-72)or just the later?

hvychve · 02-26-2007, 01:38 PM

Huck , you are so right, there was that shield most forget about when redoing a sm. blk. to a bg. blk. I too found this out, and am curious to the answer for the years they used this shield??? I would like to find one.

**WorkinLonghorn** · 02-26-2007, 04:40 PM

Quote:

Quote:
Originally Posted by special-K
All big block trucks had 4spds or TH400,so all big blocks had high-humps.Dig?

I've seen 1 or 2 big block trucks with the 3 on the tree. Don't remember what hump they had, though.
__________________
-Adam

Truck Data Book lists a special H.D.3spd was available with BB,at least in '69 with the 396.

**special-K** · 02-26-2007, 04:58 PM

I forgot that.I had a`68 396/3spd many years ago but couldn`t tell you about the hump for sure.I think it was low,but wouldn`t swear to it.

irelands18 · 02-26-2007, 05:07 PM

I have a factory 396, three on the tree, with the "Big" tranny hump, and yes the BB had the sheild on the firewall(Passenger side), SB did not. TELL-TALE sign if it's factory. What exact years these were on I am unsure of though!

dave666693 · 02-26-2007, 06:04 PM

I have a 67' 2wd with a 327/ TH400 and a small hump

Longhorn Man · 02-26-2007, 06:08 PM

thank you Dave... everyone tells me I'm full of sh!t when i tell them small blocks with a Th400 got a small hump
Big blocks with 4 speed or auto, got a high hump
all 4X4.. high hump
all 4 speeds.. high hump
I've seen many many small block Th400 trucks with a low hump.

one odd ball which i owned, was a 1/2 ton GMC with a 305 V-6?th400. (originally that's what it had anyways) this truck had a factory high hump floor. I have yet to see anyother 1/2 ton V-6/Th400 truck to compair it to.

**special-K** · 02-26-2007, 06:17 PM

Man,I thought I had it in a nutshell,damn!Right again,I also recall that I`ve had a C/30 with 350/TH400/small hump.But,I thought it had to do with the taller frame.
I think this is the first time I recall that we`ve truly ironed this out since I`ve been here.I love to learn this stuff.

Once again,where else are you going to learn such good info on these trucks?This site kicks it!!

So,can we put it in a nutshell,yet?

02-25-2007, 10:24 PM	#1
68 bigblock Registered User Join Date: Sep 2006 Location: North Carolina Posts: 8	Factory big block truck? The guy i bought my truck from said it was a factory big block truck,it has a 396 in it now but i just want to know for sure if i came factory with a big block in it.any help?68 short bed

02-25-2007, 10:43 PM	#2
Joe67 67 is sold Join Date: Apr 2001 Location: Troy, Michigan Posts: 6,738	Re: Factory big block truck? My 72 chassis has factory dual exhaust brackets welded the frame, are those indicators of a BB truck? __________________ Joe - Formerly 67c10step ------------------------------- 1967 Chevy Stepside - ECE 4/6, fuelcell, 5lug - SOLD gr8lakes - My ebay auctions Click here to order forum apparel :: Click here to become a subscribing member

02-25-2007, 10:47 PM	#3
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,020	Re: Factory big block truck? There was 402s and 396s in some of these trucks originally (only 2wds though),it should be listed on the glovebox label,might be on emblems too.I dont think they came with BBCs in 67 though Last edited by 1969k10stepside; 06-03-2007 at 02:26 PM.

02-25-2007, 10:52 PM	#4
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,365	Re: Factory big block truck? I think 69 was avaliable with a 396 and 70 was a 402. I might be wrong. As far as 68 I am not sure if a 396 was an option. __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

02-25-2007, 10:53 PM	#5
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,020	Re: Factory big block truck? One of them years was a transition from "396" emblems to "402" It was right around 1970 or so..

02-25-2007, 11:22 PM	#6
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,935	Re: Factory big block truck? 68 was the first year for the BBC, only a 396 was available. They changed to the 402 later. The glovebox sticker or build sheet is the only way to be sure what the truck had originally. __________________ 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

02-25-2007, 11:23 PM	#7
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,718	Re: Factory big block truck? I believe 68 and 69 had the 396. 68 would not have fender badges for it. 69 had 396 fender emblems. 70-72 had the 8-400 emblems (402) I think 67 was small block only trucks. or sixes... __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

02-25-2007, 11:53 PM	#8
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,365	Re: Factory big block truck? My 70cst has the original 402BB. __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

02-26-2007, 12:10 AM	#9
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,504	Re: Factory big block truck? I have 2 1968s with factory 396s in them. One chevy and one GMC

02-26-2007, 12:22 AM	#10
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Re: Factory big block truck? shouldn't a big block truck have a high tranny hump too? Thats how i usually tell the difference __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

02-26-2007, 12:38 AM	#11
stsalvage Scrapper 1 Join Date: Jan 2007 Location: Riverside Calif Posts: 1,649	Re: Factory big block truck? the 1964 chevy truck had the first big block it was a it was a tall deck and in 1966 was offered with a 396 long bed and high hump dose not matter if it was big block or small block can't understand why chevy had 2 humps me it would of been cheeper to just make one floor and make it easyer on us GM folks to want a 350 or 400 trans thats me

02-26-2007, 08:50 AM	#13
ProStreet68SB The Engine Whisperer Join Date: Sep 2006 Location: Ohio Posts: 770	Re: Factory big block truck? High humps didnt just come in big block trucks, iirc they also came in all 4x4's, and all 4speed trucks regardless of the motor.

02-26-2007, 10:19 AM	#15
72k20+afew Registered User Join Date: Dec 2006 Location: National City Michigan Posts: 15	Re: Factory big block truck? Didn't the big block trucks have the newer stye motor mounts i know the one i have out back does and i looked it up and that was original for 71 gmcs __________________ No NO NO Sir Don't Want em Can't Use em Couldn't Afford em If I Did

02-26-2007, 01:17 PM	#18
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,269	Re: Factory big block truck? didn't the BB trucks also have the heat shield mounted to the lower firewall above the pass side exhaust --? Was that all years (68-72)or just the later?

02-26-2007, 01:38 PM	#19
hvychve To The Levy Join Date: Jan 2007 Location: california Posts: 391	Re: Factory big block truck? Huck , you are so right, there was that shield most forget about when redoing a sm. blk. to a bg. blk. I too found this out, and am curious to the answer for the years they used this shield??? I would like to find one.



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02-26-2007, 04:58 PM	#21
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: Factory big block truck? I forgot that.I had a`68 396/3spd many years ago but couldn`t tell you about the hump for sure.I think it was low,but wouldn`t swear to it. __________________ "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 ~ Last edited by special-K; 02-26-2007 at 05:01 PM.

02-26-2007, 05:07 PM	#22
irelands18 Registered User Join Date: Feb 2007 Location: Chesterland, Ohio Posts: 12	Re: Factory big block truck? I have a factory 396, three on the tree, with the "Big" tranny hump, and yes the BB had the sheild on the firewall(Passenger side), SB did not. TELL-TALE sign if it's factory. What exact years these were on I am unsure of though! __________________ Everyone should drive a CHEVY, but if they did..... My dog would have nothing to lift his leg by and piss on!

02-26-2007, 06:04 PM	#23
dave666693 Registered User Join Date: Jul 2005 Location: Edgewood, WA Posts: 899	Re: Factory big block truck? I have a 67' 2wd with a 327/ TH400 and a small hump Last edited by dave666693; 02-26-2007 at 06:05 PM. Reason: add info

02-26-2007, 06:08 PM	#24
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Factory big block truck? thank you Dave... everyone tells me I'm full of sh!t when i tell them small blocks with a Th400 got a small hump Big blocks with 4 speed or auto, got a high hump all 4X4.. high hump all 4 speeds.. high hump I've seen many many small block Th400 trucks with a low hump. one odd ball which i owned, was a 1/2 ton GMC with a 305 V-6?th400. (originally that's what it had anyways) this truck had a factory high hump floor. I have yet to see anyother 1/2 ton V-6/Th400 truck to compair it to.

02-26-2007, 06:17 PM	#25
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: Factory big block truck? Man,I thought I had it in a nutshell,damn!Right again,I also recall that I`ve had a C/30 with 350/TH400/small hump.But,I thought it had to do with the taller frame. I think this is the first time I recall that we`ve truly ironed this out since I`ve been here.I love to learn this stuff. Once again,where else are you going to learn such good info on these trucks?This site kicks it!! So,can we put it in a nutshell,yet? __________________ "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 ~ Last edited by special-K; 02-26-2007 at 06:19 PM.

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