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#1 |
Senior Member
![]() Join Date: Jan 2002
Location: PORT NECHES, TEXAS / USA
Posts: 1,681
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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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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 |
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#2 |
4x4 Guy
![]() Join Date: Jul 2014
Location: Lakewood, Colorado
Posts: 130
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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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#3 |
BlahBlahBlah
![]() Join Date: Feb 2002
Location: Monroe, Wa.
Posts: 14,107
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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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. . Taking some time away ... Ill be back!! |
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#4 |
4x4 Guy
![]() Join Date: Jul 2014
Location: Lakewood, Colorado
Posts: 130
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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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Chevy Runs Deep. 1956 210 LS3 4L65E 3.31 Posi 12 Bolt 1969 Z/28 LS3 T56 3.73 Posi 12 Bolt 1971 K20 Custom 20 SWB 454/TH350/NP205 3.73 1972 K5 Blazer 307/TH350/NP205 3.07 1972 K10 Suburban Custom 10 350/TH350/NP205 3.73(Orig) 1973 Nova SS 355 TH350 2.73 Posi 12 Bolt 2010 2SS/RS Camaro LS3 T56 Aqua Blue Metallic |
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#5 |
Senior Member
![]() Join Date: Jan 2002
Location: PORT NECHES, TEXAS / USA
Posts: 1,681
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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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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 |
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#6 |
The Original Thread Killer
![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 17,944
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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.... LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles |
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#7 |
4x4 Guy
![]() Join Date: Jul 2014
Location: Lakewood, Colorado
Posts: 130
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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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#8 | |
The Original Thread Killer
![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 17,944
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Re: 70 3/4 ton 4x4 Info. For bigblock
Quote:
I don't know about the 4x4's but I know it won't work with the C's, I tried it..... LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles |
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#9 |
4x4 Guy
![]() Join Date: Jul 2014
Location: Lakewood, Colorado
Posts: 130
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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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#10 |
member
Join Date: Dec 2003
Location: Silver Spring Md.20901
Posts: 2,026
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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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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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