72 Burb 4WD Big Block Questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

budder71 · 09-08-2009, 09:41 PM

I have a Arizona 1972 Chevrolet Suburban 3 Door 4WD as rust free as you could ask for and I want to do a frame off restoration and when I go back I want to go with a Big Block. Is it going to take alot of modifications in the engine bay ? Anyone out there that has completed or helped in a Big Block
installation please help with any information or advice you have ...

gcburdic · 09-09-2009, 10:16 AM

I don't think it is a lot of work....I think you would have to change the engine towers to BB.
I'm sure others will chime in too....

**Hart_Rod** · 09-09-2009, 10:27 AM

Sound like you'll need a bunch of these parts,

.....

http://67-72chevytrucks.com/vboard/s...d.php?t=361657

blue 72 gmc 4x4 · 09-09-2009, 11:51 AM

We have a 72 GMC 4wd burb and my dad put a big block in it. He had to move the motor mts, tranny mts and transfer case mts all forward. We had to have both drivelines remade also. Was alot of work but I'd say its worth it.

Livrat · 09-09-2009, 12:08 PM

I have done several big block conversions on 4X4's, There are a number of ways to go.. You can use the stock small block engine mounting crossmember.

If you leave the engine in the stock small block location the pass valve cover will hit the firewall, and if you use an HEI distributor it will also hit the firewall.. on this configuration you would either need to massage the firewall for both or use a body lift.. this is the easiest method.

You can move it all forward 2-3 inches, drill holes for the engine mount crossmember, drill the holes for the transfer case crossmember, move the AT trans linkage forward, then modify the transfer case shifter, shorten the front driveshaft and had a new rear one built. then for a fan shroud use a stock V8 2WD one, This way is the most work.

OR.. you use a T-700R4 overdrive trans which is longer than a T-350. then you can leave the transfer case and the rest of the drivetrain in the stock location. which means no driveshaft mods,shifter mods etc.. all you would need to do is move the engine mount crossmember forward, drill the holes, use a factory 2WD fan shroud and bolt it all up.. to me this is the prefered method..

budder71 · 09-10-2009, 12:20 AM

thanks for all the information guys !!! It will be a chore either
way I go but I like the last choice with the T 700R and just move the motor mounts forward.... I will for sure be back with more questions as I get a little
closer.. thanks again...
Budder71

09-08-2009, 09:41 PM	#1
budder71 Registered User Join Date: Jul 2009 Location: Hattiesburg Mississippi Posts: 697	72 Burb 4WD Big Block Questions I have a Arizona 1972 Chevrolet Suburban 3 Door 4WD as rust free as you could ask for and I want to do a frame off restoration and when I go back I want to go with a Big Block. Is it going to take alot of modifications in the engine bay ? Anyone out there that has completed or helped in a Big Block installation please help with any information or advice you have ... Last edited by budder71; 09-08-2009 at 09:42 PM.

09-09-2009, 10:16 AM	#2
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: 72 Burb 4WD Big Block Questions I don't think it is a lot of work....I think you would have to change the engine towers to BB. I'm sure others will chime in too.... __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

09-09-2009, 10:27 AM	#3
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: 72 Burb 4WD Big Block Questions Sound like you'll need a bunch of these parts, ..... http://67-72chevytrucks.com/vboard/s...d.php?t=361657 __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

09-09-2009, 11:51 AM	#4
blue 72 gmc 4x4 Registered User Join Date: Jul 2009 Location: Aladdin Wy Posts: 796	Re: 72 Burb 4WD Big Block Questions We have a 72 GMC 4wd burb and my dad put a big block in it. He had to move the motor mts, tranny mts and transfer case mts all forward. We had to have both drivelines remade also. Was alot of work but I'd say its worth it.

09-09-2009, 12:08 PM	#5
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: 72 Burb 4WD Big Block Questions I have done several big block conversions on 4X4's, There are a number of ways to go.. You can use the stock small block engine mounting crossmember. If you leave the engine in the stock small block location the pass valve cover will hit the firewall, and if you use an HEI distributor it will also hit the firewall.. on this configuration you would either need to massage the firewall for both or use a body lift.. this is the easiest method. You can move it all forward 2-3 inches, drill holes for the engine mount crossmember, drill the holes for the transfer case crossmember, move the AT trans linkage forward, then modify the transfer case shifter, shorten the front driveshaft and had a new rear one built. then for a fan shroud use a stock V8 2WD one, This way is the most work. OR.. you use a T-700R4 overdrive trans which is longer than a T-350. then you can leave the transfer case and the rest of the drivetrain in the stock location. which means no driveshaft mods,shifter mods etc.. all you would need to do is move the engine mount crossmember forward, drill the holes, use a factory 2WD fan shroud and bolt it all up.. to me this is the prefered method..

09-10-2009, 12:20 AM	#6
budder71 Registered User Join Date: Jul 2009 Location: Hattiesburg Mississippi Posts: 697	Re: 72 Burb 4WD Big Block Questions thanks for all the information guys !!! It will be a chore either way I go but I like the last choice with the T 700R and just move the motor mounts forward.... I will for sure be back with more questions as I get a little closer.. thanks again... Budder71

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