70 3/4 ton 4x4 Info. For bigblock - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**STP67-72** · 03-14-2017, 10:40 PM

I have a local guy wanting to install a bigblock in a 70 4x4 suburban. What motor mounts will work best. Somebody told him valve covers on a big block will hit fire wall ??? Also HEI will be close. It's a 350- granny 4speed now. Thanks for any and all help !! I don't think they made 402 bb 4x4 suburbans ???

ajviper · 03-14-2017, 10:47 PM

I have a 71 K10 SWB truck I put a 454 in. I used the stock small block mounts but I moved the motor forward 2 inches. No issues with firewall clearance.

CG · 03-14-2017, 10:49 PM

I don't know the exact amount but the engine needs to be moved forward a couple inches. You should post this on the main board or the 4x4 area. Putting a big block in a burb 4x4 is no different than putting one in a pick up 4x4

Or Im slow and just have ajviper answer lol

ajviper · 03-14-2017, 11:06 PM

Just an add-on. I moved my motor to the forward set of holes in the frame. I can grab some pictures of it tomorrow if you want me to.

**STP67-72** · 03-15-2017, 07:50 AM

Yes. Send pictures. I will forward them to him.

**LockDoc** · 03-15-2017, 08:48 AM

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If he is going to use the stock BB exhaust manifolds he will have to use the '68-'71 BB frame brackets/perches. The BB manifolds won't clear the SB frame brackets/perches....

LockDoc

ajviper · 03-15-2017, 01:37 PM

My friend had a 396 with manifolds in his K10 with the stock mounts. No frame cuts. Motor was in the stock position up tight on the firewall. I mocked it up and it will fit 2 inches forward with the manifolds I have. I will try to grab the numbers from those as well.

**LockDoc** · 03-15-2017, 02:34 PM

Quote:

Originally Posted by ajviper

My friend had a 396 with manifolds in his K10 with the stock mounts. No frame cuts. Motor was in the stock position up tight on the firewall. I mocked it up and it will fit 2 inches forward with the manifolds I have. I will try to grab the numbers from those as well.

I don't know about the 4x4's but I know it won't work with the C's, I tried it.....

LockDoc

ajviper · 03-15-2017, 05:09 PM

Sorry about it not being ultra nice looking under the hood. The truck is a daily driver so it isn't the prettiest.

The first picture shows the engine crossmember holes.

I can pull the HEI very easily without any issues or interference from the firewall.

I run a set of Hooker Competition Headers 2463HKR. The only tight spot is on the passenger shackle and a slightly shorter bolt took care of that problem.

I run 1972 2WD big block fan shroud and accessories.

When I installed the big block I also installed a set of new HD 3 leafs. I used polyurethane mounts on the engine. No issues with 3rd member to engine crossmember clearance or the oil pan hitting the crossmember.

If he wants to ask questions I can PM my number and he can call me. I am more than happy to answer any questions.

olblue60@aol.com · 03-21-2017, 09:31 AM

I moved my engine forward as well. I moved it 1 7/8 inches but I believe it makes no difference. You will be happy with the extra firewall clearance at the distributor.

03-14-2017, 10:40 PM	#1
STP67-72 Senior Member Join Date: Jan 2002 Location: PORT NECHES, TEXAS / USA Posts: 1,664	70 3/4 ton 4x4 Info. For bigblock I have a local guy wanting to install a bigblock in a 70 4x4 suburban. What motor mounts will work best. Somebody told him valve covers on a big block will hit fire wall ??? Also HEI will be close. It's a 350- granny 4speed now. Thanks for any and all help !! I don't think they made 402 bb 4x4 suburbans ??? __________________ 55 Chevy original swb (big back window) 61 Chevy bubble top (427-5 speed) 67 Chevy stepside (Krusty) 68 Chevy swb fleet (Lola) 68 Chevy swb fleet 71 Chevy swb fleet ( future PB project) 97 crew cab power stroke 07 SS Trail blazer

03-14-2017, 10:47 PM	#2
ajviper Registered User Join Date: Jul 2014 Location: Lakewood, Colorado Posts: 90	Re: 70 3/4 ton 4x4 Info. For bigblock I have a 71 K10 SWB truck I put a 454 in. I used the stock small block mounts but I moved the motor forward 2 inches. No issues with firewall clearance.

03-14-2017, 10:49 PM	#3
CG BlahBlahBlah Join Date: Feb 2002 Location: Monroe, Wa. Posts: 19,769	Re: 70 3/4 ton 4x4 Info. For bigblock I don't know the exact amount but the engine needs to be moved forward a couple inches. You should post this on the main board or the 4x4 area. Putting a big block in a burb 4x4 is no different than putting one in a pick up 4x4 Or Im slow and just have ajviper answer lol __________________ … … … … … … … … ... … … … … … … … … … … … Monroe Swap meet May 18-19. Mike has the same spots for the NW guys he's had forever. Lunch time BBQ at the spaces. If you have stuff to sell bring it along. If you have a question PM stllookn (Mike) here via the board. https://67-72chevytrucks.com/vboard/...d.php?t=851291

03-14-2017, 11:06 PM	#4
ajviper Registered User Join Date: Jul 2014 Location: Lakewood, Colorado Posts: 90	Re: 70 3/4 ton 4x4 Info. For bigblock Just an add-on. I moved my motor to the forward set of holes in the frame. I can grab some pictures of it tomorrow if you want me to. __________________ Chevy Runs Deep. 1956 210 LS1 TH350 3.31 Posi 12 Bolt 1969 Z/28 5.3 T56 3.73 Posi 12 Bolt 1973 Nova SS 355 TH350 2.73 Posi 12 Bolt 2000 K2500 Suburban LS 6.0 4L80 3.73 G80 2005 K2500HD CCSB LS 6.0 4L80 4.10 G80 2010 2SS/RS Camaro LS3 T56 Aqua Blue Metallic

03-15-2017, 07:50 AM	#5
STP67-72 Senior Member Join Date: Jan 2002 Location: PORT NECHES, TEXAS / USA Posts: 1,664	Re: 70 3/4 ton 4x4 Info. For bigblock Yes. Send pictures. I will forward them to him. __________________ 55 Chevy original swb (big back window) 61 Chevy bubble top (427-5 speed) 67 Chevy stepside (Krusty) 68 Chevy swb fleet (Lola) 68 Chevy swb fleet 71 Chevy swb fleet ( future PB project) 97 crew cab power stroke 07 SS Trail blazer

03-15-2017, 08:48 AM	#6
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,317	Re: 70 3/4 ton 4x4 Info. For bigblock - If he is going to use the stock BB exhaust manifolds he will have to use the '68-'71 BB frame brackets/perches. The BB manifolds won't clear the SB frame brackets/perches.... LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

03-15-2017, 01:37 PM	#7
ajviper Registered User Join Date: Jul 2014 Location: Lakewood, Colorado Posts: 90	Re: 70 3/4 ton 4x4 Info. For bigblock My friend had a 396 with manifolds in his K10 with the stock mounts. No frame cuts. Motor was in the stock position up tight on the firewall. I mocked it up and it will fit 2 inches forward with the manifolds I have. I will try to grab the numbers from those as well.

03-15-2017, 05:09 PM	#9
ajviper Registered User Join Date: Jul 2014 Location: Lakewood, Colorado Posts: 90	Re: 70 3/4 ton 4x4 Info. For bigblock Sorry about it not being ultra nice looking under the hood. The truck is a daily driver so it isn't the prettiest. The first picture shows the engine crossmember holes. I can pull the HEI very easily without any issues or interference from the firewall. I run a set of Hooker Competition Headers 2463HKR. The only tight spot is on the passenger shackle and a slightly shorter bolt took care of that problem. I run 1972 2WD big block fan shroud and accessories. When I installed the big block I also installed a set of new HD 3 leafs. I used polyurethane mounts on the engine. No issues with 3rd member to engine crossmember clearance or the oil pan hitting the crossmember. If he wants to ask questions I can PM my number and he can call me. I am more than happy to answer any questions. Attached Images

03-21-2017, 09:31 AM	#10
olblue60@aol.com member Join Date: Dec 2003 Location: Silver Spring Md.20901 Posts: 2,031	Re: 70 3/4 ton 4x4 Info. For bigblock I moved my engine forward as well. I moved it 1 7/8 inches but I believe it makes no difference. You will be happy with the extra firewall clearance at the distributor. __________________ 1967 C/K10 Chevy Panel 1968 C/K20 Chevy Pickup 1968 C/K10 Chevy Suburban 1941 Chevy Sedan Delivery 1960 Chevy Sedan Delivery 1972 Camaro SS 396 #s matching 1971 Harley FX Superglide



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