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09-13-2008, 05:19 PM
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#1 |
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Registered User
 
Join Date: Mar 2002
Location: Dallas, TX
Posts: 555
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68 GMC 4x4 Pics
Forced inside by Ike, so I decided to try and post some pictures. Added a couple of the GMC 305 V6 since most people are not familiar with them. A lot of folks don't like them, but I do. I had custom pistons made to give me 9:1 compression and installed GMC Magnum heads. The Magnum heads have 2.25 intake and 1.875 exhaust valves for pretty good flow. Desk top dyno says it is around 250 hp with 300ft-lb at 2000rpm. I switched from 4.56 to 3.73 gears with posi front and rear. The new front Dana axle has power disk brakes. I installed a 2.5 inch soft ride lift all around for looks and comfort. Got some buddy buckets redone on the inside, otherwise a plain stock interior.
I am now finishing up a NV4500/NP205 combo to be installed in a few months. Plan to remove the cab for this job, so I will add a Vintage Air conditioning system too. My long term mod is a new engine. I am currently building a 454 V6 from a 478 V6. The 478 uses a big truck crank and flywheel, but a 305 V6 crank will fit and allow using the original flywheel. The cranks have different strokes, so that is where the 454 ci comes from.
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1968 GMC 305 V6 3/4 4x4 Stepside 06 Corvette Daily Driver Dallas TX |
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09-13-2008, 05:30 PM
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#2 |
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Registered User
Join Date: May 2006
Location: at work
Posts: 2,552
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Re: 68 GMC 4x4 Pics
Tuff lookn truck!!!
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R.I.P. Killer 71 10/26/07 |
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09-13-2008, 06:06 PM
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#3 |
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Registered User
Join Date: Nov 2006
Location: Pahrump, NV
Posts: 1,079
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Re: 68 GMC 4x4 Pics
Very nice, I like it!
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09-13-2008, 06:31 PM
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#4 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: 68 GMC 4x4 Pics
Nice to see a unique engine in one of these.Even though the V-6 was offered most decide to go with a small block.I like my inlne but the V is certainly different.I didn't5 know you could build a 454 from the factory parts though.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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09-13-2008, 06:49 PM
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#5 |
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Currently Blazerless
Join Date: Apr 2000
Location: St. Joseph Mo.
Posts: 4,828
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Re: 68 GMC 4x4 Pics
Looks great Erl....yours has always been one of my favorite trucks on the board.
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1972 C/30 133" W.B. C&C 1970 GMC 3500 157" W.B. single wheel C&C |
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09-13-2008, 07:16 PM
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#6 |
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Resident of Here
Join Date: May 2008
Location: Wesley Chapel, FL, USA
Posts: 7,716
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Re: 68 GMC 4x4 Pics
Awesome truck! Great engine!
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~Bradley~ 2004 Black GTO LS2/T56 too much to list  Miss having a truck 
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09-13-2008, 07:23 PM
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#7 |
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Senior Member
Join Date: Jan 2005
Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA
Posts: 2,097
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Re: 68 GMC 4x4 Pics
i dont like step sides at all but that one looks TOUGH !!!! and the engine your building sounds like a wild concoction of parts. lol
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09-13-2008, 07:56 PM
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#8 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,852
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Re: 68 GMC 4x4 Pics
What a nice truck.Everything is just right.
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"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 ~ |
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09-13-2008, 08:07 PM
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#9 |
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Registered User
Join Date: Feb 2008
Location: Johnson City Tennessee
Posts: 1,191
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Re: 68 GMC 4x4 Pics
that is to cool i love it
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Greater love hath no man than to lay down his life for a friend. Members i Have met Earl Slick68 1969 Stepside Build thread http://67-72chevytrucks.com/vboard/s...=1#post4253546  Chevy Trucks the longest lasting most dependable trucks on the road
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09-13-2008, 08:23 PM
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#10 |
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MEMBER OF THE JUNK MAN CLUB
Join Date: Jul 2001
Location: paragould arkansas 72450
Posts: 425
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Re: 68 GMC 4x4 Pics
on you tube there is a v12 gmc engine like this v6, i dont know if is factory or custom built using 2 of the v6 engines. it is a neat video!!
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I LIKE 67-72 CHEVYS, I HAVE OWNED OVER 150 OF THEM IN THE LAST 25 YEARS..
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09-13-2008, 08:37 PM
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#11 |
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Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: 68 GMC 4x4 Pics
nice truck... probably what mine look like when newer (fleetside though). Any pics of the inside and those tow hooks? I need to know which way they are supposed to twist...
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The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" |
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09-13-2008, 08:46 PM
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#12 |
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laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,457
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Re: 68 GMC 4x4 Pics
Now you know the guy down at the gas staion or the parts store ain't gonna believe that he's looking at a 454 V6. You'll leave em scratchin their heads...
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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09-13-2008, 08:51 PM
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#13 |
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Weekend Warrior
Join Date: Oct 2004
Location: CT
Posts: 1,787
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Re: 68 GMC 4x4 Pics
Nice Truck. How about some specs on those tires? - They look nice and aggressive.
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-'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered  
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09-13-2008, 08:56 PM
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#14 |
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Registered User
Join Date: Feb 2008
Location: Johnson City Tennessee
Posts: 1,191
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Re: 68 GMC 4x4 Pics
post that you tube video
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Greater love hath no man than to lay down his life for a friend. Members i Have met Earl Slick68 1969 Stepside Build thread http://67-72chevytrucks.com/vboard/s...=1#post4253546 Chevy Trucks the longest lasting most dependable trucks on the road
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09-13-2008, 09:22 PM
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#15 |
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Nothing to see here.....
Join Date: Jun 2007
Location: Shawnee, KS
Posts: 4,625
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Re: 68 GMC 4x4 Pics
that truck just looks right. beeeeeuatiful. period.
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Doug  THANK YOU to our American Soldiers & Veterans - POW MIA "You will NEVER be forgotten". The democracy will cease to exist when you take away from those who are willing to work and give to those who would not. Thomas Jefferson |
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09-13-2008, 09:40 PM
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#16 |
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Registered User
Join Date: Dec 1999
Location: Mid NE USA
Posts: 2,212
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Re: 68 GMC 4x4 Pics
Nice truck Great setup.
Ron
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Member #111 68 C-10 Daily Driver70  4x4 Project76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson |
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09-13-2008, 11:03 PM
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#17 |
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I'm a poor spectator
Join Date: Aug 2006
Location: San Antonio, Tx
Posts: 2,287
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Re: 68 GMC 4x4 Pics
That is a kick ass truck.
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2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!!  1979 Ford F150 4x4 SWB Built Ford Tough!!!  1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!! |
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09-13-2008, 11:13 PM
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#18 | |
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Registered User
Join Date: May 2008
Location: Alta Loma, Ca.
Posts: 930
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Re: 68 GMC 4x4 Pics
Quote:
What distributor did you use to get the HEI? Nice looking truck, the mods are geat and it will still look stock. With the torque you develope the 3.73 change was a good idea. How much shorter is the 454 stroke from 478? Off the top of my head it seems like maybe 1/4". What rods and pistons will you use? |
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09-13-2008, 11:16 PM
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#19 |
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Tot Roddin'
Join Date: Apr 2005
Location: Mid-MO
Posts: 24,461
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Re: 68 GMC 4x4 Pics
That is a great looking original truck!
Nice work, and I personally love the 305!
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-Nate 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) |
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09-13-2008, 11:20 PM
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#20 |
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Registered User
Join Date: Sep 2004
Location: Pierre SD
Posts: 1,533
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Re: 68 GMC 4x4 Pics
You should top off the engine with a set of the plaid valve covers, just to get more second looks.
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I think the world needs a drink...  Help somebody...If you can....VanZant We're not wrong, we're not sorry, and its probably gonna happen again. That's the truth about men. Tracy Byrd Member# 13924 '70 c10, 350/350 '68 c10 250/4spd '68 c10 no eng/trans fac ps/pb/ac/at (future father/sons project) '48 Chevy Loadmaster |
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09-13-2008, 11:32 PM
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#21 |
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Future TOTM Winner
Join Date: Aug 2006
Location: Bulverde, TX
Posts: 2,692
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Re: 68 GMC 4x4 Pics
NICE! I like the GMC V6s. I can't even imagine how cool the 454 V6 will be.
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72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com |
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09-13-2008, 11:54 PM
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#22 |
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Registered User
Join Date: Dec 2006
Location: Idaho
Posts: 210
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Re: 68 GMC 4x4 Pics
Very nice. I'm not a step side fan, but that one looks great.
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72 C2500 LWB 402 Sierra Grande 05 Odyssey 08 Tundra |
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09-14-2008, 08:19 AM
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#23 |
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Post Whore
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,684
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Re: 68 GMC 4x4 Pics
That is a favorite truck of mine!
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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09-14-2008, 10:03 AM
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#24 |
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Senior Member
Join Date: May 2001
Location: West Central Minnesota
Posts: 568
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Re: 68 GMC 4x4 Pics
Great looking truck, Erl! The V6/NV-4500 combo sounds interesting. You used 427 pistons for the 9.0:1 compression in the 305, right?
Bob
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V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel |
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09-14-2008, 10:11 AM
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#25 |
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I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: 68 GMC 4x4 Pics
OH MAN I LOVE THAT TRUCK!!! I've got a 401 block and set of 351 Magnum heads that I'm dying to put in the something! My hat goes off to you going down the road less traveled with the V6!
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 09-14-2008 at 10:15 AM. |
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