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#1
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The '60-'69 GMC 305 V6 conversion to a Pontiac V8.
I have heard the GMC trucks from '60-'69 have a GMC 305 V-6. By any chance, has anyone converted from a V6 to a Pontiac V8? Just that I have seen some of these trucks for sale, and would rather convert to a Pontiac V8 instead of a "Chebbie".
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#2
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Something else to add.
Have some pics and responses, please.
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#3
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That 60 degree V6 is not a chevy engine it is a GMC design, chevy never used it in their trucks. Since a Pontiac was available as an option in 55-57 GMCs there should be plenty of room for the swap and possibly I have a feeling that if you could find GMC/Pontiac mounts you might have a starting point to work from. These early trucks(55-57) used one central mount under the cast iron timing cover and I believe 2 side mounts on the bellhousing area.
If not you would have to fab later style motor mounts (2 side mounts and a single central transmission mount) and which should not be too difficult if you have decent fabrication skills. I've never done this particular swap but it can't be any harder than putting a Pontiac Stratostreak V8 in a 4X4 Jeep Wagoneer or a Jeep pickup truck which I have done.
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated Last edited by Sirrotica; 07-11-2011 at 07:38 PM. |
#4
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They also made a 351,401 & 478 cid version; very tough engines. Pisses me off when I see one of those yanked for a 350 Chebby
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Two 1975 455 Grandvilles & '79 455 Trans Am ‘69 Camaro SS 396/375 (owned since ‘88) ‘22 Toyota Sequoia V8 ‘23 Lexus LS500 awd ‘95 Ford F-super duty 4wd 7.3 p-stroke & countless Jeeps & off road vehicles. |
#5
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I had one in a 65 GMC truck, would climb a mountain but didnt like going over 60 mph LOL
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
#6
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Quote:
As Brad said, Pontiac engines were used as the V8 option in light/medium GMC trucks (up through series 500)- in model years '55 - '59. But the '60 GMC was so totally redesigned (torsion bar front springs, etc.) that this doesn't help you at all- I don't think a single chassis part carried over from '59 to '60. Try oldgmctrucks.com- some member there has probably converted a '60 -'66 to a V8.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
#7
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I had a Jimmy with one of those V-6 motors, not sure what cube but in a pick up. Damn thing had Scotch Pladd valve covers on it....from factory..think it was the "thrifty" version.. Pulled like a draft horse...I changed it over to a truck style 4 speed....and promptly twisted drive shaft in pieces !! Neat motor...but not fast.
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ECM member. 2008 Outlaw Pontiac Drag Series Champion MANDRA Do it now fool! Life is short. 69 Grand Prix/3163lbs / IAII 535 w/ Tiger heads by Gaydosh....9.35@ 144 so far.. through mufflers. 1.26 60'. Going back to track with pump gas engine.... My 60 Ventura retired to street/strip duty.. |
#8
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Agreed Brad. My Uncle still has a 2 ton grain trunk under his barn with the 305 V-6. I keep trying to get him to give it to me as it has been sitting for years but he is wont. I remember driving it as a kid loaded with corn and it had no problems at all. Top speed was 55 as we just kept the gas pedal on the floor at all times. I love to find me one of those engine for a generator project I'm building.
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#9
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Quote:
http://www.google.com/imgres?imgurl=...9QEwAg&dur=404
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#10
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OMG, brings back memories, 19 yrs old, was wrenching at a Gulf gas station in Easton Pa. guy bring in this GMC pu says it either has cracked head or head gasket, so after getting the intake off and undoing all of the headbolts I pry up on the corners just to break the seal.
Now I was fresh off the farm and would normally just reach in with both hands and "yank" the head off the motor and out of the engine bay. This time the head "yanked" me into the engine bay. Pistons like coffee cans! LOL I also think that the water pump weighed about 200 lbs, thanks for taking me back 35 years. |
#11
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I read that they even made a 702 ci V12 with two 351 v6 inline with a single crankshaft! Yikes. Need a pic of that.
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63 Catalina coupe 455 budget drag car 11's 1/4 , 7.4 1/8th 66 Star Chief Executive 57k mile 69 Le Mans 2 dr HT 350 85k mile 15 sec 1/4 69 Firebird 400 Burgandy/Black 70 Olds Rallye 350 F85 4 speed 3.91's 70 Olds Cutlass Cruiser Red Wagon 350 101k miles 15 sec 1/4 12 sec w 455 74 Cheyenne Super C10 LWB Gen 6 454 w ZZ502 cam 3.07gear 13.1 1/4, 8.3 1/8 2020 RAM 1500 SLT 4x4 5.7 A8 Hemi 2007 Hummer H3 3.7 liter turd 2019 Chevy Spark petrol car 38 mpg |
#12
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Quote:
http://thunderv12.com/ http://www.google.com/search?q=702+c...ient=firefox-a
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated Last edited by Sirrotica; 07-26-2011 at 10:04 PM. |
#13
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Quote:
Here are a couple on Epay http://motors.shop.ebay.com/i.html?_...2+v-12&_sacat=
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#14
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Cool.. thanks for the link to the the Thunder ...pricey..yikes
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63 Catalina coupe 455 budget drag car 11's 1/4 , 7.4 1/8th 66 Star Chief Executive 57k mile 69 Le Mans 2 dr HT 350 85k mile 15 sec 1/4 69 Firebird 400 Burgandy/Black 70 Olds Rallye 350 F85 4 speed 3.91's 70 Olds Cutlass Cruiser Red Wagon 350 101k miles 15 sec 1/4 12 sec w 455 74 Cheyenne Super C10 LWB Gen 6 454 w ZZ502 cam 3.07gear 13.1 1/4, 8.3 1/8 2020 RAM 1500 SLT 4x4 5.7 A8 Hemi 2007 Hummer H3 3.7 liter turd 2019 Chevy Spark petrol car 38 mpg |
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