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#1 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
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L96 6.0 swap into 72 longhorn. some questions
So after years of debating, I'm finally putting an LS in my ole 72 c20 longhorn. Probably putting the cart before the horse, but, now that I have the motor, I’m starting to work out what I will need to do. So I have a few questions.
Here is what I have • L96 6.0 out of a 2018 express van 2500 with a 6l90 trans. 9k miles supper nice! • It does have the e78 ECU (12687342) • Has the full harness and the gas pedal. Not as info on this motor swap, so I’m asking here to help me find the info. 1. Clearances. a. A/C fit in the stock location? Looks like it could be tight. b. Will the stock exhaust manifolds fit? Or must I use headers? c. Stock oil pan work? 2. I need to have the ac work. The truck is an A/C and has currently working A/C. can the stock stuff be used and just have hoses made? Or is there a better way 3. The e78 cu, I have read there are issues getting someone who can flash the ecu. What are the options here? 4. Fuel tanks. I rebuilt and coated my stock tank behind the seat and my one saddle tank. Can I use these tanks, leave the lines to my selector valve, then put an in-line pump and filter? 5. Suggestions for motor mounts? 6. Where can I find the pinouts for this particular motor/van? 7. pedal. Anyone ever rig up something to preserve the original pedal. that is mount the pedal to the new pedal assembly. 8. where are most people mounting the ecu? in the cab under the dash? id like to see options 9. need to convert the oil and trans dipsticks from the van to the truck..what motors would use the dipsticks that would work? There will be more, and I will make a project post of progress. What say you? love to hear input, not so much on judgment and unhelpful comments.
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban Last edited by mtdave2; 06-21-2021 at 04:15 PM. |
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#2 |
Registered User
Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 971
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Re: L96 6.0 swap into 72 longhorn. some questions
8. where are most people mounting the ecu? in the cab under the dash? id like to see options.
I've heard that van wiring harnesses are a good choice because they are longer and will allow you to put the ECU in the cab. My preference would be to put it under the console (or under the bench seat) after you get it thinned. c. Stock oil pan work? That motor is a Gen IV right? My 5.3 is a Gen IV and the stock pan worked fine. But I'm not sure if the van pan and truck pan are the same? Find that out. If the same you can swap dipstick tube assemblies. Truck dipstick for a 6L90 should work in yours. It's easy enough to compare the two while they're out. |
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#3 |
Registered User
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
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Re: L96 6.0 swap into 72 longhorn. some questions
You might be able to use stock exhaust manifolds in the back engine position
Favorite choice seems to be trailblazer ss manifolds they tuck in a bit more then the silverado ones Most headers I seen need to cut down the case for a 4l80e I would think 6l90e will be simaler 6l90 I read a bit stock that may hunt for gears I would look Into what there issues may be |
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#4 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: L96 6.0 swap into 72 longhorn. some questions
I used the Hooker Blackheart engine stands (with F-body mounts) and cross member. Puts the engine down low which preserves driveline angles and allows the stock low mount compressor to work without modifying anything. May need to clearance frame slightly for ps pump (because engine sits low). I’m using an in tank pump and retaining my in cab tank. I mounted the ecu on the fender behind the inner turn down…cannot see it unless you are searching for it. I used the TBSS manifolds…no clearance issues. I believe your trans will require a high hump tunnel. The 4l60e I used cleared the low hump by about 3/8”.
I asked many of the same types of questions you are asking. My advice read, read, and read some more. Most answers are out there. Last edited by Davidf; 06-22-2021 at 08:55 AM. |
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#5 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
|
Re: L96 6.0 swap into 72 longhorn. some questions
[QUOTE=Davidf;8935133]I used the Hooker Blackheart engine stands (with F-body mounts) and cross member.
Which hoocker blackhearts did you use?
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#6 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: L96 6.0 swap into 72 longhorn. some questions
[quote=mtdave2;8935297]There is only one choice for year and engine generation: BHS511 engine stands, fits narrow frame rail C10's. 71222024HKR-1 for the cross member that fits the 4L80.
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#7 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
|
Re: L96 6.0 swap into 72 longhorn. some questions
thanks Dave.
now you said "I’m using an in-tank pump and retaining my in-cab tank" is there a drop-in pump for those tanks? I would have to rig up 2 one for each tank. perhaps I'm misreading what you meant.
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#8 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
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Re: L96 6.0 swap into 72 longhorn. some questions
Congratulations and have some fun with it. Be sure to be very careful taking out the exhaust manifold bolts as they almost always break. 9000 miles is a nice find! I would replace them bolts though no matter what you use for exhaust. I went with Speed Engineering headers just because no TBSS manifolds were coming up anywhere. I'll be getting back on mine soon as I have finally flipped my house. I could not fit the F-body AC in so I just recently went with a Holley Sanden style bracket and I am impressed with the stoutness.
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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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#9 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
|
Re: L96 6.0 swap into 72 longhorn. some questions
[quote=Davidf;8935308]so mine is a c20 and has the 6l90... still work?
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#10 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: L96 6.0 swap into 72 longhorn. some questions
I am using the GPA-2 pump from tanks inc. it will require custom bent 3/8” lines to adapt to tall and skinny tank (so pickup sits on bottom of tank). If you go this route, you will need to remove your tank, fill with water and cut access hole for pump next to level sender. You will also need split ring and gasket to mount pump assembly.
Last edited by Davidf; 06-23-2021 at 09:45 AM. |
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#11 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: L96 6.0 swap into 72 longhorn. some questions
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#12 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
|
Re: L96 6.0 swap into 72 longhorn. some questions
Any ideas on where i can find the wire diagrams?
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#13 |
Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
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Re: L96 6.0 swap into 72 longhorn. some questions
Alldatadiy has the wiring diagrams.
Skip the trailblazer manifolds. The passenger side is fine, but the driver side kicks out into the frame rail at a funny angle. The 2010-15 Camaro SS manifolds are the best factory manifolds for these older narrow-frame trucks. They stay tucked in tight, and it's easy to get a wrench on the manifold flanges from the top side. The 2010-15 Camaro manifolds are relatively cheap if you peruse the classifieds of various Camaro enthusiast forums and facebook groups. Folks frequently pull them off when installing long tubes. You should be able to pick up a set for around $100. Try to get a couple inches of the down pipe to go with the manifolds. That will make it easier fabricating the rest of the exhaust.
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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#14 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
|
Re: L96 6.0 swap into 72 longhorn. some questions
https://youtu.be/mLys0vfCVr0
if anyone cares..lol. im done. glad i did it, the longhorn is now a bad mfer
__________________
____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#15 |
Senior Member
![]() Join Date: Sep 2014
Location: Wenatchee, Wa
Posts: 910
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Re: L96 6.0 swap into 72 longhorn. some questions
Beautiful job and very neat and tidy!!
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#16 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
|
Re: L96 6.0 swap into 72 longhorn. some questions
Looks very nice indeed! Sounds good too. Some more pics or videos are necessary though!
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__________________
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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#17 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
|
Re: L96 6.0 swap into 72 longhorn. some questions
__________________
____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#18 |
Registered User
Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 971
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Re: L96 6.0 swap into 72 longhorn. some questions
Glad you got it done! I watched the video hoping to see your documentation of the process but you skipped a lot, lol. Maybe you could go back to your original questions and provide your solutions. Might help some else doing a similar build.
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