V6 to small block swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1967gm4x4 · 03-06-2013, 02:27 PM

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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c10srule · 03-06-2013, 04:45 PM

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

BOHICA-Chevy68 · 03-06-2013, 05:18 PM

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.

Tx Firefighter · 03-06-2013, 07:40 PM

Quote:

Originally Posted by BOHICA-Chevy68

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.

His V6 is a behemoth GMC engine. Old school stuff here. No way compares to 90 degree late model V6 engines.
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1967gm4x4 · 03-06-2013, 07:42 PM

Are big blocks and small blocks the same length from the motor mounts to the back of the block?
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1967gm4x4 · 03-06-2013, 07:44 PM

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
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BOHICA-Chevy68 · 03-06-2013, 08:16 PM

thanks for the info Tx Firefighter. L4561

Tx Firefighter · 03-06-2013, 08:24 PM

Quote:

Originally Posted by BOHICA-Chevy68

thanks for the info Tx Firefighter. L4561

Read up on them if you get a few minutes. They were big giant engines with gobs of torque. Some of them even came from the factory with plaid valve covers. Seriously. A neat bit of history.
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1967gm4x4 · 03-06-2013, 11:10 PM

Well got the 402 out tonight getting ready to set the 350 in place tomorrow everything should bolt right up.
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1967gm4x4 · 03-06-2013, 11:11 PM

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Vintage Windmills · 03-06-2013, 11:17 PM

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

1967gm4x4 · 03-07-2013, 12:18 AM

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.
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Vintage Windmills · 03-07-2013, 12:26 AM

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.

1967gm4x4 · 03-07-2013, 07:56 PM

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.
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Vintage Windmills · 03-07-2013, 08:02 PM

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:

1967gm4x4 · 03-07-2013, 08:22 PM

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.
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03-06-2013, 02:27 PM	#1
1967gm4x4 Registered User Join Date: Jan 2013 Location: Pennsylvania Posts: 99	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? 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

03-06-2013, 04:45 PM	#2
c10srule Registered User Join Date: Oct 2012 Location: oran,mo. Posts: 171	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

03-06-2013, 07:42 PM	#5
1967gm4x4 Registered User Join Date: Jan 2013 Location: Pennsylvania Posts: 99	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? 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

03-06-2013, 07:44 PM	#6
1967gm4x4 Registered User Join Date: Jan 2013 Location: Pennsylvania Posts: 99	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

03-06-2013, 11:10 PM	#9
1967gm4x4 Registered User Join Date: Jan 2013 Location: Pennsylvania Posts: 99	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 Attached Images __________________ 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

03-06-2013, 05:18 PM	#3
BOHICA-Chevy68 Registered User Join Date: Feb 2013 Location: Gilbert, AZ Posts: 46	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.

03-06-2013, 08:16 PM	#7
BOHICA-Chevy68 Registered User Join Date: Feb 2013 Location: Gilbert, AZ Posts: 46	thanks for the info Tx Firefighter. L4561

03-06-2013, 11:11 PM	#10
1967gm4x4 Registered User Join Date: Jan 2013 Location: Pennsylvania Posts: 99	Re: V6 to small block swap Posted via Mobile Device Attached Images __________________ 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

03-06-2013, 11:17 PM	#11
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	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 __________________ 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

03-07-2013, 12:18 AM	#12
1967gm4x4 Registered User Join Date: Jan 2013 Location: Pennsylvania Posts: 99	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

03-07-2013, 12:26 AM	#13
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	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

03-07-2013, 07:56 PM	#14
1967gm4x4 Registered User Join Date: Jan 2013 Location: Pennsylvania Posts: 99	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

03-07-2013, 08:02 PM	#15
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	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: Attached Images __________________ 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

03-07-2013, 08:22 PM	#16
1967gm4x4 Registered User Join Date: Jan 2013 Location: Pennsylvania Posts: 99	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 Attached Images __________________ 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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