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03-06-2013, 02:27 PM
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#1 |
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Registered User
Join Date: Jan 2013
Location: Pennsylvania
Posts: 99
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V6 to small block swap
Does anybody know from the factory in the GMCs if the small blocks were mounted in a different location than the v6s? The truck has a big block in it now and the mounts and cross members were all moved forward 3 inches. Would a small block work in that same spot?
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__________________
1967 gmc 4x4 factory air factory buckets 1985 gmc high sierra 2500 4x4 400 1972 ford f250 4x4 390.Tomorrow is the most important thing in life. Comes into us very clean. It's perfect when it arrives and puts itself in our hands. It hopes we've learned something from yesterday. John Wayne |
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03-06-2013, 04:45 PM
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#2 |
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Registered User
 
Join Date: Oct 2012
Location: oran,mo.
Posts: 171
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Re: V6 to small block swap
the small block will sit fine where the big block sits, just need to space your fan properly, this will allow you to reuse the driveshaft also
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03-06-2013, 05:18 PM
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#3 |
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Registered User
Join Date: Feb 2013
Location: Gilbert, AZ
Posts: 46
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I did this swap in my cj7 some years back. the chevy V6 has the same mounting locations as the 350. just shorter in the front from the 350.
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03-06-2013, 07:40 PM
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#4 | |
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Watch out for your cornhole !
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: V6 to small block swap
Quote:
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03-06-2013, 07:42 PM
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#5 |
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Registered User
Join Date: Jan 2013
Location: Pennsylvania
Posts: 99
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Re: V6 to small block swap
Are big blocks and small blocks the same length from the motor mounts to the back of the block?
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__________________
1967 gmc 4x4 factory air factory buckets 1985 gmc high sierra 2500 4x4 400 1972 ford f250 4x4 390.Tomorrow is the most important thing in life. Comes into us very clean. It's perfect when it arrives and puts itself in our hands. It hopes we've learned something from yesterday. John Wayne |
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03-06-2013, 07:44 PM
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#6 |
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Registered User
Join Date: Jan 2013
Location: Pennsylvania
Posts: 99
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Re: V6 to small block swap
Never mind c10srule already answered that, I think I'll be alright with the fan clearing it is very tight now with a big block and Its hard to find parts when it's not meant to be in that truck. Thanks everybody for the help
Posted via Mobile Device
__________________
1967 gmc 4x4 factory air factory buckets 1985 gmc high sierra 2500 4x4 400 1972 ford f250 4x4 390.Tomorrow is the most important thing in life. Comes into us very clean. It's perfect when it arrives and puts itself in our hands. It hopes we've learned something from yesterday. John Wayne |
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03-06-2013, 08:16 PM
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#7 |
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Registered User
Join Date: Feb 2013
Location: Gilbert, AZ
Posts: 46
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thanks for the info Tx Firefighter. L4561
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03-06-2013, 08:24 PM
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#8 | |
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Watch out for your cornhole !
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: V6 to small block swap
Quote:
Posted via Mobile Device |
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03-06-2013, 11:10 PM
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#9 |
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Registered User
Join Date: Jan 2013
Location: Pennsylvania
Posts: 99
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Re: V6 to small block swap
Well got the 402 out tonight getting ready to set the 350 in place tomorrow everything should bolt right up.
Posted via Mobile Device
__________________
1967 gmc 4x4 factory air factory buckets 1985 gmc high sierra 2500 4x4 400 1972 ford f250 4x4 390.Tomorrow is the most important thing in life. Comes into us very clean. It's perfect when it arrives and puts itself in our hands. It hopes we've learned something from yesterday. John Wayne |
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03-06-2013, 11:11 PM
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#10 |
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Registered User
Join Date: Jan 2013
Location: Pennsylvania
Posts: 99
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Re: V6 to small block swap
Posted via Mobile Device
__________________
1967 gmc 4x4 factory air factory buckets 1985 gmc high sierra 2500 4x4 400 1972 ford f250 4x4 390.Tomorrow is the most important thing in life. Comes into us very clean. It's perfect when it arrives and puts itself in our hands. It hopes we've learned something from yesterday. John Wayne |
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03-06-2013, 11:17 PM
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#11 |
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Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: V6 to small block swap
Curious how well the 402 fit in there with it being a 4x4.
By the way, nice truck, i just looked at a pic of it in the show your truck thread. Whats the history of the truck? Does it have PS and PB? There are a handful of us here with 67 GMC 4x4's. I have 2 at the moment- the one in my sig and a super custom with factory tach, buddies, 305v6, and PB. You should just need the smallblock engine stands and you;ll be set. Check out this thread for ID: http://67-72chevytrucks.com/vboard/s...d.php?t=437680
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore  )86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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03-07-2013, 12:18 AM
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#12 |
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Registered User
Join Date: Jan 2013
Location: Pennsylvania
Posts: 99
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Re: V6 to small block swap
It was very tight in there there was about a 1/4 of an inch between the frame and exhaust manifolds and about a half an inch between the fan and radiator. It has PS and PB along with the rear sliding window buddy buckets and A/C. It was bought it Phoenix Arizona I have all the original paper work protecto plate even the original dealership keychain. I was tryin to find a v6 to put back in but I had a 350 sitting there ready to go. Would like to put one back in one day.
Posted via Mobile Device
__________________
1967 gmc 4x4 factory air factory buckets 1985 gmc high sierra 2500 4x4 400 1972 ford f250 4x4 390.Tomorrow is the most important thing in life. Comes into us very clean. It's perfect when it arrives and puts itself in our hands. It hopes we've learned something from yesterday. John Wayne |
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03-07-2013, 12:26 AM
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#13 |
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Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: V6 to small block swap
Sounds like a nice truck. Is the rear window full size or small? Is the steering ram assist?
I think I'm going to drop a 351 V6 in mine. I'd like to find a 478 since I think the exterior dimensions are the same.
__________________
67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore )86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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03-07-2013, 07:56 PM
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#14 |
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Registered User
Join Date: Jan 2013
Location: Pennsylvania
Posts: 99
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Re: V6 to small block swap
Yea it has the large rear window I'm not sure if its ram assist or not no SPID. Is there another way to tell? Does anybody know a good place to get the small block mounts for a 67 I tried the ones that were in there and the oil pan is hitting the crossmember I think there old v6 mounts that someone cut holes for the big block because there are other holes on the towers also.
Posted via Mobile Device
__________________
1967 gmc 4x4 factory air factory buckets 1985 gmc high sierra 2500 4x4 400 1972 ford f250 4x4 390.Tomorrow is the most important thing in life. Comes into us very clean. It's perfect when it arrives and puts itself in our hands. It hopes we've learned something from yesterday. John Wayne |
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03-07-2013, 08:02 PM
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#15 |
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Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: V6 to small block swap
I guess you didn't click on the link I posted about the engine stands. It points out the 67-72 small block stands. I have a spare set I will send for free, just pm me your address.
The ram assist is hard to miss. Heres a pic of mine:
__________________
67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore )86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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03-07-2013, 08:22 PM
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#16 |
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Registered User
Join Date: Jan 2013
Location: Pennsylvania
Posts: 99
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Re: V6 to small block swap
I don't see anything like that under there so it must not have That. I will send my address I really appreciate it. Here's a pic of one of the mounts that were on it they look nothing like anything in the thread.
Posted via Mobile Device
__________________
1967 gmc 4x4 factory air factory buckets 1985 gmc high sierra 2500 4x4 400 1972 ford f250 4x4 390.Tomorrow is the most important thing in life. Comes into us very clean. It's perfect when it arrives and puts itself in our hands. It hopes we've learned something from yesterday. John Wayne |
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