1967 - 1969 4X4 V6 Crossmember - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1972RedNeck · 01-09-2017, 10:03 AM

I recently picked up a couple of 478 V6 GMC engines. One of them is likely going into my old F20 Farmall tractor that I just picked up with a bad engine. The other will hopefully find it's way into my '72 K20.

My question for you folks is this. On the 4X4's, is the entire V6 crossmember different from the V8 crossmember or is it just the perches? Does anyone happen to have pictures? Know where to get one?

57taskforce · 01-09-2017, 10:18 AM

Subd! don't have an answer for you but I'd like to see this come together. It should be pretty cool.

1972RedNeck · 01-10-2017, 09:57 AM

Bump?

James the III · 01-10-2017, 10:22 AM

The 477.7-cubic-inch (7,828 cc) 478 was one of the largest V6 engines ever built. Gross output was 254 hp (189 kW) at 3700 rpm and 442 lb·ft (599 N·m) at 1400 rpm. Bore was 5.125 in (130.2 mm) and stroke was 3.86 in (98 mm). It was introduced in 1962 as a Magnum engine in the 6500 series trucks.

I'm thinking the frame in these 6500 series is much different than a c-10/20

**Classic v6 GMC's** · 01-10-2017, 12:32 PM

Here is a pic of the V6 crossmember and perches.
V8 crossmembers and perches are different.

1972RedNeck · 01-10-2017, 03:40 PM

Quote:

Originally Posted by Classic v6 GMC's

Here is a pic of the V6 crossmember and perches.
V8 crossmembers and perches are different.

That's out of a 4X4? It definitely is way different from a V8. I suppose the one you have pictured isn't for sale?

Do you know if the transmission was mounted in the same location behind a V6 as a V8 or was it all slid forward?

1972RedNeck · 01-10-2017, 03:42 PM

Quote:

Originally Posted by James the III

The 477.7-cubic-inch (7,828 cc) 478 was one of the largest V6 engines ever built. Gross output was 254 hp (189 kW) at 3700 rpm and 442 lb·ft (599 N·m) at 1400 rpm. Bore was 5.125 in (130.2 mm) and stroke was 3.86 in (98 mm). It was introduced in 1962 as a Magnum engine in the 6500 series trucks.

I'm thinking the frame in these 6500 series is much different than a c-10/20

Sure is. But 305's and 351's were available in GMC pickups up to '69. A 478 should bolt in place of a 305/351.

James the III · 01-10-2017, 03:52 PM

Quote:

Originally Posted by 1972RedNeck

Sure is. But 305's and 351's were available in GMC pickups up to '69. A 478 should bolt in place of a 305/351.

Maybe, but I'm thinking taller deck might be an issue.. and the 478 oil pan might not have the profile to clear the crossmember,
that's a lot of cubes in a 60* 6 hole .
bet a tall deck bbc is shorter.

**Classic v6 GMC's** · 01-10-2017, 05:29 PM

Quote:

Originally Posted by 1972RedNeck

That's out of a 4X4? It definitely is way different from a V8. I suppose the one you have pictured isn't for sale?

Do you know if the transmission was mounted in the same location behind a V6 as a V8 or was it all slid forward?

Yes it was out of a 4x4. I actually sold this one to a board member about a month ago.

All the transmissions were mounted in the same location to my knowledge.

RANDY COX · 01-10-2017, 08:17 PM

Quote:

Originally Posted by Classic v6 GMC's

Here is a pic of the V6 crossmember and perches.
V8 crossmembers and perches are different.

This is for a 4x4 but for a 292 inline six, very very very hard to find...I searched for over a yr for the passenger side perch, never did find one...

**Classic v6 GMC's** · 01-10-2017, 09:50 PM

Quote:

Originally Posted by RANDY COX

This is for a 4x4 but for a 292 inline six, very very very hard to find...I searched for over a yr for the passenger side perch, never did find one...

The crossmember is the same for 292 and V6. The perches are v6 only.

**MusicMan70** · 01-11-2017, 12:12 AM

Here is a link to a Board members album; I think he goes by ERL. His truck is Majestic! He may have some answers or specifics as well.
http://www.jackpalmerphotos.com/CarD...C-V6/i-nP3rJcR

Here are some photos I saved from an old EBay listing of a 1969 V6 4WD.

*on a side note, the engine mount on the driver-side, does not appear to be the block style I have normally seen for these engines.

1972RedNeck · 01-11-2017, 11:38 AM

Quote:

Originally Posted by James the III

Maybe, but I'm thinking taller deck might be an issue.. and the 478 oil pan might not have the profile to clear the crossmember,
that's a lot of cubes in a 60* 6 hole .
bet a tall deck bbc is shorter.

305 and 478 have the same deck height. 305 pickup oil pan will fit on a 478.

1972RedNeck · 01-11-2017, 11:39 AM

Quote:

Originally Posted by Classic v6 GMC's

The crossmember is the same for 292 and V6. The perches are v6 only.

Good to know. Did you sell the cross member and perches or just the cross member?

**Classic v6 GMC's** · 01-11-2017, 11:43 AM

Quote:

Originally Posted by 1972RedNeck

Good to know. Did you sell the cross member and perches or just the cross member?

The cross member and perches.

01-09-2017, 10:18 AM	#2
57taskforce All about them K’s Join Date: Jun 2014 Location: Land of Entrapment Posts: 6,487	Re: 1967 - 1969 4X4 V6 Crossmember Subd! don't have an answer for you but I'd like to see this come together. It should be pretty cool. __________________ Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s

01-10-2017, 10:22 AM	#4
James the III Registered User Join Date: Nov 2016 Location: lowell ma Posts: 750	Re: 1967 - 1969 4X4 V6 Crossmember The 477.7-cubic-inch (7,828 cc) 478 was one of the largest V6 engines ever built. Gross output was 254 hp (189 kW) at 3700 rpm and 442 lb·ft (599 N·m) at 1400 rpm. Bore was 5.125 in (130.2 mm) and stroke was 3.86 in (98 mm). It was introduced in 1962 as a Magnum engine in the 6500 series trucks. I'm thinking the frame in these 6500 series is much different than a c-10/20

01-10-2017, 12:32 PM	#5
Classic v6 GMC's Senior Member Join Date: Mar 2015 Location: Arizona from Overland Park Kansas Posts: 3,968	Re: 1967 - 1969 4X4 V6 Crossmember Here is a pic of the V6 crossmember and perches. V8 crossmembers and perches are different. Attached Images __________________ Current projects: 1966 Chevy Custom PS PB A/C BBW 283 v8 3 speed OD 1966 GMC Long Step 1966 GMC 3/4 ton Custom PS PB Sport trim 351 v6 1966 GMC 3/4 ton 4x4 Custom PB 305 v6 np435 1960 GMC Custom 1968 GMC 3/4 ton 4x4 Short Bed 1962 K20 Tow truck 1961 GMC Extended Suburban Panel and a few more

01-11-2017, 12:12 AM	#12
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: 1967 - 1969 4X4 V6 Crossmember Here is a link to a Board members album; I think he goes by ERL. His truck is Majestic! He may have some answers or specifics as well. http://www.jackpalmerphotos.com/CarD...C-V6/i-nP3rJcR Here are some photos I saved from an old EBay listing of a 1969 V6 4WD. *on a side note, the engine mount on the driver-side, does not appear to be the block style I have normally seen for these engines. Attached Images __________________ MusicMan70 1961 GMC Suburban

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