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11-11-2017, 08:15 PM
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#1 |
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Registered User
 
Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,054
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69 gmc 402 engine
I just bought a 69 gmc custom that is highly optioned truck. 402 engine, A/C, power steering, factory buckets, . My question is will the engine big block brackets be the same as a 71/72 k10. I was thinking about building the engine for my 72 k10.
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11-11-2017, 08:29 PM
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#2 |
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Registered User
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
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Re: 69 gmc 402 engine
I'm guessing you're talking about the motor mounts? The 4wd trucks did not come with BB's, if you use the stock cross member there are clearance issues with the passenger side frame & exhaust manifold. I have seen BB 4wd's with the frame notched for clearance. I'm thinking if you raise the engine height slightly it may improve clearance (sorta like the BB perches on the 2wd's)
There are a few members (probably more than a few) that have done this conversion, maybe they'll chime in. |
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11-11-2017, 09:25 PM
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#3 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,713
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Re: 69 gmc 402 engine
Big block swap into a 67-72 K truck comes with challenges as noted above. Even more if a manual trans. You have to REALLY want a big block to make it worthwhile. Just a feel good more than anything. 383 small block the answer to more motor in a 4x4.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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11-11-2017, 10:28 PM
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#4 |
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Registered User
Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,054
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Re: 69 gmc 402 engine
It's a auto truck.
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11-11-2017, 10:32 PM
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#5 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,713
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Re: 69 gmc 402 engine
Search the board and Google as well about big block swap into 67-72 trucks. Several of them out there documented fairly well. That will give you a good idea of everything you need to do.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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11-12-2017, 09:27 AM
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#6 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,863
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Re: 69 gmc 402 engine
On a small block with 700r4 conversion we moved the engine forward to make driveshafts work w/o alteration. My point is, if I did a big block swap (which I won't be) I would see about moving mounts forward. We used the 6 cyl position and the bonus was getting the distributor out of the firewall and allowed for taller air cleaner.
If original engine, '69 would have been 396. No big difference, but '70 was first year for 402.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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11-12-2017, 09:37 AM
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#7 |
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Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,546
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Re: 69 gmc 402 engine
I just stabbed a 406 small block in there and moved it forward. Sounds like a cool truck. Why not just keep it the way it is?
__________________
70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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11-12-2017, 12:09 PM
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#8 |
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Registered User
Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,054
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Re: 69 gmc 402 engine
The body isn't the best of shape. It's totally complete less the bucket seats and carb.
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11-12-2017, 12:25 PM
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#9 |
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Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,546
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Re: 69 gmc 402 engine
I just want to smack some people (like CSI) for letting that happen to a car or truck... Big block AC What the heck?
__________________
70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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