Author Topic: 4.3L V-6 interchange help  (Read 2541 times)

Offline zieg85

  • Global Moderator
  • Senior Member
  • ****
  • Posts: 7543
    • 73-87 GM squarebody extended cab and conversions up to 91 R/V series
4.3L V-6 interchange help
« on: September 18, 2018, 08:38:22 AM »
Does anyone know for sure if an engine out of a 97 C1500 will interchange with a 99 GMC Safari mini van?   
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18980
Re: 4.3L V-6 interchange help
« Reply #1 on: September 18, 2018, 05:18:50 PM »
Use the interchange search on car-part.com when initially looking into these things. If not, then there are sometimes small variances. For Example, my cousin totaled his Durango with a 4.7L. I took it for my Jeep but the only difference was the oil pan and pickup.
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline zieg85

  • Global Moderator
  • Senior Member
  • ****
  • Posts: 7543
    • 73-87 GM squarebody extended cab and conversions up to 91 R/V series
Re: 4.3L V-6 interchange help
« Reply #2 on: September 18, 2018, 05:54:13 PM »
Use the interchange search on car-part.com when initially looking into these things. If not, then there are sometimes small variances. For Example, my cousin totaled his Durango with a 4.7L. I took it for my Jeep but the only difference was the oil pan and pickup.

I can't thank you so much for such an excellent resource. 
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline Stewart G Griffin

  • Senior Member
  • ****
  • Posts: 3324
Re: 4.3L V-6 interchange help
« Reply #3 on: September 22, 2018, 01:33:22 PM »
i'm not 100% "for sure," but, of course, both blocks should bolt in.  And, both engines should be L35's, so the inductions systems/topside stuff should be identical and should interchange, but even if they aren't the same mpfi, they should still interchange between both blocks and heads.

i think the dipsticks will be different.

i know this is not that helpful.  Can i ask what you are trying to do?

Offline Stewart G Griffin

  • Senior Member
  • ****
  • Posts: 3324
Re: 4.3L V-6 interchange help
« Reply #4 on: December 17, 2018, 01:04:21 AM »
Part 2:


i'm thinking of going Astro.  i don't need to tow that heavy and i think a van is more useful to me than a suburban.   So, i was wondering if we could discuss the different iterations of the 4.3?

--The 85-6 had carb.  That's pretty solid and straightforward.

--Then 87 to 95 had tbi.  Again, pretty straightforward and problem free.
Although some astros had CPI (also see below) optional starting in 92

--Then the 96 to 2002 had the SCPI  "spider" fuel injection.
i have heard that this is problematic.  Both the CPI and SCPI.


---2002 on up had "regular" multi-point fuel injection.  And this should be ok?


Offline zieg85

  • Global Moderator
  • Senior Member
  • ****
  • Posts: 7543
    • 73-87 GM squarebody extended cab and conversions up to 91 R/V series
Re: 4.3L V-6 interchange help
« Reply #5 on: December 27, 2018, 06:47:53 PM »
Does anyone know for sure if an engine out of a 97 C1500 will interchange with a 99 GMC Safari mini van?
after looking at the hidden rust I have concluded this will be parted out then filled with scrap and dropped off to get what I can for it.
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/