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#1 |
Senior Member
Join Date: Dec 2003
Location: Colorado
Posts: 351
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Anyone driving an original 67 V6 305?
I posted this question on the engine section of the forum but wondered if anyone viewing here has a 305 V6?
I had never seen one until today. It's in an original '67 GMC longbed. It was pretty neat as the plugs and wires enter the head on the intake manifold side, not on the exhaust manifold side like most heads. ![]() Just wondering if this was a standard option or something unusual?
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The Fastor Pastor '68 swb, 447 BBC/ 6-71 Weiand, Dual 950 Bigs Carbs/ 2 1/2" Header tubes - 4" collectors/ M-21 4speed: '70 swb; TH-400 - bagged & shaved. Looking for new engine or parts. Wife - Original {A Real Classic!} ![]() |
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#2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Anyone driving an original 67 V6 305?
chevy had the S series for inlines, e series for V 8... well GMC had the M series for the v6 trucks.
They were common at one time, but not so much anymore. There's few ppl here running them still though. |
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#3 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,877
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Re: Anyone driving an original 67 V6 305?
I have one of those v6's, not sure on the size. Its in a 65. It runs and has a rebuilt carb. I tried to give it away, but no one wanted it, or it was too far away. We finally got around to stripping the truck. Keeping the auto trans and cross member. Rest is going to the scrapper. Seems like a waste, but Im tired of hanging on to all this extra stuff.
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#4 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Anyone driving an original 67 V6 305?
Weren't all of those V-6's 305's? Seems that they came out in the '60 models. Prior to that GMC used engines from different GM sources in their trucks. For instance, my '38 had a Pontiac 226 flathead in it. The Chevy had a 216OHV engine. I knew a guy who had a '57 and it had 347Pontiac in it. Larger models from GMC also used Buick straight 8's, back in the day.
Did GMC stop using the 305 with the introduction of the 68's or the '69's? I understand they were torquey, but liked to guzzle the petrol.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#5 |
Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: Anyone driving an original 67 V6 305?
I know a guy down the road from me with a mid 60's GMC with the V6, has a big 14bolt type rear too, all original.
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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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#6 | |
FarmBoy.
Join Date: Feb 2005
Location: Rhinelander, WI
Posts: 1,103
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Re: Anyone driving an original 67 V6 305?
to my knowledge, the GMV V-6's came in several models of 305s, along with 351's, and even a 478, if i rememeber correctly.
http://www.6066gmcguy.org/ this site is going to have..well..basically everything you want/need to know about those old V6's. enjoy! -Sam.
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1969 GMC C1500. long fleet. 307. 3 on the tree. 3.07 gears. Oliver green. Bent and bruised. Daily Driver. Quote:
http://67-72chevytrucks.com/vboard/s...d.php?t=242993 |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Anyone driving an original 67 V6 305?
up till 69, you could get the 305, and I think 68 was the last year for the 351.
GMC used there own engines for a long time, but after GM bought them, they started grabbing other engines from other divisions. There was a 401 I think in the V6 too, and then the big V 12 that was 2 v6's together. Some one will post a link to the jolly site here soon.. .all the V6 info you can handle. |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Anyone driving an original 67 V6 305?
HAHAHA!!!! I guess I am a slow typer!
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#9 |
Junior Member
Join Date: May 2007
Location: Fort Worth, TX
Posts: 47
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Re: Anyone driving an original 67 V6 305?
What's the bore size on the 305? Those pistons have to be huge.
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72 C10 Long Bed, Vortec 350, Muncie M20, 3.73 Posi 79 Camaro, Vortec 350, Muncie M21, 3.90 Posi 07 BMW 328i, Wife's |
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#10 |
Registered User
Join Date: Jun 2007
Location: mississippi
Posts: 181
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Re: Anyone driving an original 67 V6 305?
I saw one opened up a while back, they look like those big "folgers" coffee cans.
supposed to be very torquey |
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#11 |
Truck and auto performance nut
Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
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Re: Anyone driving an original 67 V6 305?
I drive a truck that has one for now...soon to be replaced with a SBC. Its a '68 though, and has the 3sp. on the column.
I think I read somewhere that they consider this a big block V6: great engines. make nice torque but not alot of hp. they are stronger then the straight 6's though.
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken Last edited by 68GMCCustom; 07-17-2007 at 12:04 AM. Reason: added info |
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#12 |
Junior Member
Join Date: May 2007
Location: Fort Worth, TX
Posts: 47
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Re: Anyone driving an original 67 V6 305?
http://en.wikipedia.org/wiki/GMC_V6_engine
Pretty interesting, I didn't know there was a GM V6 in the 60's. The big 478ci was only 254hp, but with 442lb ft. I wonder what the gas mileage was. Of course, my Jetta is "only" 100hp, but it gets up and goes with 177lb ft. I have a great appreciation for "6's" now that I didn't have a couple months ago. If I could do it again, I wouldn't have bought the V8.
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72 C10 Long Bed, Vortec 350, Muncie M20, 3.73 Posi 79 Camaro, Vortec 350, Muncie M21, 3.90 Posi 07 BMW 328i, Wife's |
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#13 |
Truck and auto performance nut
Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
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Re: Anyone driving an original 67 V6 305?
I'll trade you my V6 for a Vortec 350!
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
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#14 |
GMCDAC
Join Date: Apr 2006
Location: Rapid City, SD
Posts: 837
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Re: Anyone driving an original 67 V6 305?
I am also pretty new to the v-6 stuff, but besides all the bigass stuff you guys are talkin about, there is that torque monster 702 V-12 GMC created by combining 2 351's. Ignition was fired out of one distributor with 2 6 cyl caps stickin sideways out of the main driver. Jolly has a great site.
I recently got a 62 K2500 with a 305E and I will never pull that out for sbc. Later---DAC
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1970 GMC K5 Jimmy Custom 4X4 Mom's driver from 1971 to 2001!! Under rebuild! 1972 GMC C2500 Pickup owned since 1979 Needs a rest and refurbish! 1955 GMC 100 2nd design driven almost daily! Rest In Peace Mom. "Dolly" 7/15/23 - 5/18/09 GMC driver for 30 years! ![]() Last edited by 70gmcjimmy; 07-17-2007 at 12:32 AM. |
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#15 |
Junior Member
Join Date: May 2007
Location: Fort Worth, TX
Posts: 47
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Re: Anyone driving an original 67 V6 305?
Hehehe, I knew that was coming
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72 C10 Long Bed, Vortec 350, Muncie M20, 3.73 Posi 79 Camaro, Vortec 350, Muncie M21, 3.90 Posi 07 BMW 328i, Wife's |
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#16 | |
GMCDAC
Join Date: Apr 2006
Location: Rapid City, SD
Posts: 837
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Re: Anyone driving an original 67 V6 305?
Quote:
Later---DAC
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1970 GMC K5 Jimmy Custom 4X4 Mom's driver from 1971 to 2001!! Under rebuild! 1972 GMC C2500 Pickup owned since 1979 Needs a rest and refurbish! 1955 GMC 100 2nd design driven almost daily! Rest In Peace Mom. "Dolly" 7/15/23 - 5/18/09 GMC driver for 30 years! ![]() |
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#17 | |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: Anyone driving an original 67 V6 305?
Quote:
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#18 |
Registered User
Join Date: Apr 2005
Location: Chula Vista, California
Posts: 495
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Re: Anyone driving an original 67 V6 305?
I have an original '67 GMC w/the 305 V-6 and I love it. I used to have a '65 V-6 and I wouldn't mind getting another one as well. In my opinion the GMC V-6 is one of the coolest pure truck engines ever built. They don't like to rev much, but they have boatloads of low end grunt. What other engine will allow you to start in 3rd gear on flat ground without slipping the clutch??
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rwgregory 67 GMC 2500 ,2w/d wide box 305 V-6, 4-speed |
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#19 |
Registered User
Join Date: Jun 2007
Location: mississippi
Posts: 181
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Re: Anyone driving an original 67 V6 305?
i wouldn't mind havin one in a weekend warrior just for kicks. they are a cool motor to have.
do they make any performance cams or anyting for those? |
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#20 | |
Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
Posts: 5,620
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Re: Anyone driving an original 67 V6 305?
Quote:
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#21 |
Registered User
Join Date: Apr 2005
Location: Chula Vista, California
Posts: 495
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Re: Anyone driving an original 67 V6 305?
'68 longbed: There are ZERO hi-po parts made for the GMC V-6. This is definately a "throwback" engine. The only way to light a fire under one is to modify other parts to fit it. Buick V-6 HEI distributors can be made to work with a little machine work, headers can be custom built, intakes and heads can be cleaned up with porting, you can bolt on a bigger carb and other than that, just use your imagination. In all honesty, they would make a lousy hot rod. If you try to get high RPM out of them they will blow up. They were designed from the ground up to grunt at low RPM. Use them as they were intended to be used from the factory and enjoy the ride...
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rwgregory 67 GMC 2500 ,2w/d wide box 305 V-6, 4-speed |
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#22 |
Senior Member
![]() Join Date: Aug 2005
Location: Los Angeles
Posts: 1,332
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Re: Anyone driving an original 67 V6 305?
I have a '67 with the 351. These engines have amazing torque at low r.p.m.'s. I have a 500 c.f.m. Holley 2 bbl. and a Pertronix ignition on it, and it does run better than it did stock. The last year for the 351 was '68, and the 305 was dropped in March of '69, but it was a dealer installed option through '72. The GMC V-6's were available in the 2 ton and larger trucks until '74.
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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. |
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#23 |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: Anyone driving an original 67 V6 305?
Yeah, throw a 500cfm holley 2bbl. on one and it will wake them up a lot, but even then, they're still no hot rod.
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#24 |
Registered User
Join Date: Apr 2005
Location: Dunlap, IL
Posts: 308
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Re: Anyone driving an original 67 V6 305?
I put around 35,000 miles on my 66 GMC 305 V-6 in college. Like everyone else has said they are torque monsters but definitely not hot rod material.
Around here there are still lots of grain trucks/dump trucks on the road equipped with the V-6. I remember it not getting the greatest gas mileage, probably around 8 to 10 city, maybe 12 on the highway with a tailwind. There used to be a local guy that had one running a set of homemade headers and glasspacks. It sounded pretty sweet.
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68 GMC 64 1/2 Mustang convert A bachelor's life is no life for a single man." - Samuel Goldwyn |
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#25 |
Registered User
Join Date: Jun 2007
Location: mississippi
Posts: 181
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Re: Anyone driving an original 67 V6 305?
would be a cool "odd" motor to play with. with that much torque maybe you could gear it up and make it more funner-er
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