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Old 03-14-2017, 10:40 PM   #1
STP67-72
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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 ???
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Old 03-14-2017, 10:47 PM   #2
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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.
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Old 03-14-2017, 10:49 PM   #3
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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
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Old 03-14-2017, 11:06 PM   #4
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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.
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Old 03-15-2017, 07:50 AM   #5
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Re: 70 3/4 ton 4x4 Info. For bigblock

Yes. Send pictures. I will forward them to him.
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Old 03-15-2017, 08:48 AM   #6
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Re: 70 3/4 ton 4x4 Info. For bigblock

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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....

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Old 03-15-2017, 01:37 PM   #7
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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.
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Old 03-15-2017, 02:34 PM   #8
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Re: 70 3/4 ton 4x4 Info. For bigblock

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Originally Posted by ajviper View Post
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.....

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Old 03-15-2017, 05:09 PM   #9
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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.
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Old 03-21-2017, 09:31 AM   #10
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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.
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