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Username Post: LS swap in 72 C10?        (Topic#356545)
doubleE 
Valued Contributor
Posts: 3879

Loc: Eagan MN
Reg: 06-02-03
05-24-19 11:41 AM - Post#2767022    

Having thoughts of doing an LS engine swap. The 307 is healthy but thirsty. I have replaced the 3-on-the-tree with a 700R4 which helped push the MPG to 15 to 18 highway if I’m really easy on it and a good tail wind. She has a 3.72 rear. I’ve heard some good things about the LS engine family and wonder if I should pursue this. Have 0 experience with the LS and would like to hear some input from anyone that has some. Like what years, size ect. I see there are kits out there for the 67 – 72 C10s. Would like to keep the 700R4 or would I need to go with a electronic OD tranny? My objective would be higher MPG and improved drive ability, not high performance/power.

Eric

Proud owner of My Blue 62 Impala SS


 


TAT_2 
Member #26 "19th Year" Silver Supporting Member
Posts: 36728
TAT_2
Age: 67
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
05-27-19 05:16 PM - Post#2767207    
    In response to doubleE

I WOULD LOOK INTO THE FUEL REQUIREMENTS OF THE LS YA WANT 2 USE.
EXAMPLE MY DAILYS USE REG AVG $2.80
MY LT-1 PREMIUM AVG $3.40

09 PONTIAC- VIBE
08 PONTIAC- G6
93 VETTE - 40TH ANIV- RUBY RED- LT1/6SPD/RAG TOP
NEXT ?
PREVIOUS VETTE'S 58,68,70,76,78,85,90












 
mcdarrunt 
Newbie
Posts: 15

Reg: 11-07-18
11-02-19 02:06 AM - Post#2779345    
    In response to TAT_2

We have done several LS swaps into 69-72 C10's and it is a very straight forward procedure. Even the lower radiator hose to engine fits due to the factory cross flow radiator. Both exhaust manifolds let the pipes clear the frame and steering shaft has clearance. The ones we did had the 4l60E or 4L80E overdrive trans so can't enlightened you on using a 700R4. The LS engines have a reputation for good power, great fuel economy, and a 250k-300k lifespan. Pic is of a 70 with Vintage heat/cool so former plenum space can be used for computer components.







 
kwhizz 
"12th Year" Gold Supporting Member
Posts: 1187
kwhizz
Loc: Wisconsin
Reg: 01-01-07
01-12-20 05:23 AM - Post#2784226    
    In response to mcdarrunt

Holley / Hooker makes a kit for mounting the engine/ Trans assy right in....... I would stay with the computer controlled trans as GM intended.....



 
impalex 
Silver Supporting Member
Posts: 176
impalex
Loc: Long Beach, CA, USA
Reg: 03-13-05
01-14-20 09:57 AM - Post#2784379    
    In response to mcdarrunt

Hi mcdarrunt,

Sounds like you've done enough of these to have a system in place for making it easy. By any chance have you posted any threads where the process is laid out? Or can you link me to a thread where it is laid out?

Also, do you know what kind of mileage you're seeing once the LS Swap is in place?

I really love my completely original 350 and drivetrain (the Quadrajet carb 255hp version). I even love the 4 spd Muncie Trans. Damn it is a joy to drive. The 10mpg though, that's hard to swallow. It leaves me open to considering the LS Swap as an option.

I look forward to hearing your thoughts, or anyone else's thoughts if someone else has anything to share.


65 Impala SS w/327 and TH350 trans. "Ignorance is the parent of fear" Herman Melville-Moby Dick When it comes to cars, the above is very true!


 
HYPR 
"17h Year" Platinum Supporting Member
Posts: 10787
HYPR
Age: 68
Loc: Shaking and Burning!
Reg: 07-19-01
04-20-20 04:18 PM - Post#2791635    
    In response to mcdarrunt

  • mcdarrunt Said:
We have done several LS swaps into 69-72 C10's and it is a very straight forward procedure. Even the lower radiator hose to engine fits due to the factory cross flow radiator. Both exhaust manifolds let the pipes clear the frame and steering shaft has clearance. The ones we did had the 4l60E or 4L80E overdrive trans so can't enlightened you on using a 700R4. The LS engines have a reputation for good power, great fuel economy, and a 250k-300k lifespan. Pic is of a 70 with Vintage heat/cool so former plenum space can be used for computer components.







Loved the swap info you posted. I have a '72 C20 with a 402/TH400 equipped with a non-functioning DNE OD and a non-functioning AC. The mileage is terrible and the power is well, almost non existent, so an LS motor and Tranny combo is something to consider doing. I've been looking at the L96/6L80e combo for the 360HP/380FT and 6-speed Auto for the improved power and torque over the 402 with it's peanut sized valves which produced a whopping 240HP and 345FT and drinks gas like a fish breaths in water!
I am guessing besides improving the drive-ability I may be able to squeeze about 17-20MPG out of the new combo and cruise like a breeze with the 6 speed auto not to mention improve the towing capability. My only concern is the cost of the transplant so any advice would be helpful.

http://www.cardomain.com/ride/222599
To be born a Redneck is by chance, to live as one is by choice!
Preserving the Redneck tradition one day at a time!


 
redwhite62 
Newbie
Posts: 19

Reg: 11-18-19
07-08-20 09:36 PM - Post#2798248    
    In response to HYPR

Just bought a 1972 GMC 1/2 ton with a 4.8 LS motor and a 4l60 already installed. Need to get the odometer working to figure out my gas mileage. I am curious to see what gas I am getting in the city and on the highway. It doesn't have a ton of power but sounds good and is lot of fun to drive.



 


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