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#1 |
Registered User
Join Date: Sep 2018
Location: Fargo
Posts: 377
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72 4x4 BB swap?
I found a nice rebuild 402 for a good price Wondering how hard it is to swap a big block in i did some reading and read it doesn't fit properly?
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#2 |
Registered User
Join Date: Jun 2014
Location: lakefield,mn
Posts: 566
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Re: 72 4x4 BB swap?
I am sure that it can be done. I know the 4x4's never came with a BB, so I think the only major hurdle would be the engine stands, and maybe an oil pan. I have seen people on this forum add the BB to the 4x4 so I know it can be done.
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68 c10 swb stepper 68 c10 swb stepper 67 c10 lwb 06 gmc duramax |
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#3 |
Registered User
Join Date: Sep 2018
Location: Fargo
Posts: 377
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Re: 72 4x4 BB swap?
I actually don’t mind the 350 but it’s burning oil like a 2 stroke and most likely has 300k+ miles and I’d have so sell my extra engine I’m trading for instead of just trading for the rebuilt 402. So I would like to put the 402 in but no idea on figment anyone that has done this help would be appreciated.
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#4 |
Go Pack Go!
Join Date: Nov 2005
Location: Green Bay
Posts: 2,669
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Re: 72 4x4 BB swap?
I bought a 71 4x4 half-ton truck 17 years ago that had a BB prior to my purchase. The firewall was pounded on to make room for the distributor and the engine cradle was seriously cut to make way for the oil pan. It was upgraded to 8 lug axles from a mid-70's Chevy 3/4 ton truck.
If you're installing in a 1/2 ton with factory running gear, I'd worry about if the axles, drive shafts, and U-joints are strong enough. |
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#5 |
Registered User
Join Date: Sep 2018
Location: Fargo
Posts: 377
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Re: 72 4x4 BB swap?
Not to worried on drive train strength only be 350ish go 400 tq
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#6 |
Senior Member
![]() ![]() Join Date: Jan 2015
Location: Kearneysville Wv
Posts: 3,940
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Re: 72 4x4 BB swap?
I've done this swap before. I moved the engine mounts 2" to the front of the frame a the trans crossmember as well to make room for the heads and hei distributor and then used a 2wd shroud but the you have to resize your driveshafts but then the engine looks like it belongs in the truck without beating the crap out of the firewall
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#7 |
landarts
![]() Join Date: May 2005
Location: Star, Idaho
Posts: 1,368
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Re: 72 4x4 BB swap?
I have a 402 big block in my 72 GMC 4x4. The firewall has not been modified, back of valve covers are close to firewall and distributor really close also. Does not look like anything was moved forward. If you need a measurement let me know.
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