6.2 to 350 swap

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

R

RamblinGMC

Member
Joined
Aug 21, 2022
Posts
42
Reaction score
40
Location
Clovis Ca
First Name
Eddie
Truck Year
1982
Truck Model
c2500
Engine Size
6.2
Ring gear on my T400 flex plate exploded,destroyed the transmission and unfortunately broke the starter off the block. Truck only has 54K miles on it. Hard to find a decent 6.2. Came across a nice SBC 400 to swap in. I think I will go with a 700R4 instead of thr T400.
 
Gilmore

Gilmore

Full Access Member
Joined
May 1, 2019
Posts
71
Reaction score
40
Location
Eureka
First Name
Christopher
Truck Year
1984
Truck Model
K10
Engine Size
6.2L Diesel
RamblinGMC said:
Curious why you swapped tanks instead of just cleaning and using the ones you had?
Click to expand...
The tanks weren’t terribly expensive and the mechanics I spoke with said the lines would clean out pretty quickly but the tanks would take a while to clean out and I decided it was easier to change them. Plus the rock guards were full of mud, rocks and rust.
 
Grit dog

Grit dog

Full Access Member
Joined
May 18, 2020
Posts
5,976
Reaction score
9,923
Location
Washington
First Name
Todd
Truck Year
1986
Truck Model
K20
Engine Size
454
RamblinGMC said:
Has anyone gone from a 6.2 to a 350? What is involved in doing a swap like this? Weighing my options since the T400 blew and took the starter bolt mounts with it. Thanks for any advice!
Click to expand...
I’d keep the LS over a 350, personally…lol!
 
R

RamblinGMC

Member
Joined
Aug 21, 2022
Posts
42
Reaction score
40
Location
Clovis Ca
First Name
Eddie
Truck Year
1982
Truck Model
c2500
Engine Size
6.2
Blue Ox said:
Chitty mileage?

I did the reverse swap, so I probably can't help. But I wish you luck.

The only suggestion I have to offer is to see if you can get a GM harness for the 350 instead of reworking the diesel harness. There's a lot more 350s going to the boneyard that harnesses can be scavenged from, and somewhere there's a diesel owner looking for a glowplug harness or a water in fuel indicator where you're probably eyeing a dumpster.

Just sayin'
Click to expand...
Nothing will be going into the dumpster! I'm a car parts hoarder LOL. Besides I want to be able to go back if I come across a good 6.2
 
Grit dog

Grit dog

Full Access Member
Joined
May 18, 2020
Posts
5,976
Reaction score
9,923
Location
Washington
First Name
Todd
Truck Year
1986
Truck Model
K20
Engine Size
454
RamblinGMC said:
That crossed my mind, but I hate computer controlled engines.
Click to expand...
Ha sorry. I was making a joke. I thought you were talking about a 6.2 diesel and I was being a smart ass calling it a 6.2 LS!
 
Strick

Strick

Full Access Member
Joined
Nov 25, 2020
Posts
1,149
Reaction score
2,765
Location
Dunn, NC
First Name
Harold
Truck Year
1979
Truck Model
C20 Crew
Engine Size
350
Grit dog said:
Ha sorry. I was making a joke. I thought you were talking about a 6.2 diesel and I was being a smart ass calling it a 6.2 LS!
Click to expand...
The LS based engines sure do resemble those Detroit diesels up top. They look alot alike when disassembled.

Strickland
 
R

RamblinGMC

Member
Joined
Aug 21, 2022
Posts
42
Reaction score
40
Location
Clovis Ca
First Name
Eddie
Truck Year
1982
Truck Model
c2500
Engine Size
6.2
Strick said:
The LS based engines sure do resemble those Detroit diesels up top. They look alot alike when disassembled.

Strickland
Click to expand...
I always thought the Detroit Diesels looked a lot like a 350 with a big spider on top.
 
R

RamblinGMC

Member
Joined
Aug 21, 2022
Posts
42
Reaction score
40
Location
Clovis Ca
First Name
Eddie
Truck Year
1982
Truck Model
c2500
Engine Size
6.2
Gilmore said:
I did it recently, I changed fuel tanks, senders, motor and fuel pump obviously. The biggest thing I didn’t change that I should have was the fuel lines. I put in an inline filter and clogged three of them before I got it on the road. I also didn’t change my fuel tank change component inside the frame rails. If you have any specific questions let me know I’m happy to share as requested.

Btw… it was a full restore so also a painless harness.
Click to expand...
Curious what wires you used for power from the original harness? I'm at this point now. Need power for the HEI and electric choke. I'm not removing any of the 6.2 harness just incase I ever go back. Thanks!
 
R

RamblinGMC

Member
Joined
Aug 21, 2022
Posts
42
Reaction score
40
Location
Clovis Ca
First Name
Eddie
Truck Year
1982
Truck Model
c2500
Engine Size
6.2
custodian said:
I did in the 85 C10. Removed everything 6.2, I cut out what wires that were not needed, used a few for power sources. I even removed the Hydroboost and replaced it with power vacuum brakes.

You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
Click to expand...
What wires did you use for power from the original harness?
 
W

Wallace6

Full Access Member
Joined
Aug 4, 2023
Posts
142
Reaction score
77
Location
Wyoming
First Name
Ray
Truck Year
1987
Truck Model
Suburban
Engine Size
350
Is the diesel wiring worth anything,I am about to pull mine and trash it? Thanks
 
custodian

custodian

Full Access Member
Joined
Apr 15, 2016
Posts
959
Reaction score
554
Location
Catawba
First Name
William
Truck Year
1973, 1985
Truck Model
C10
Engine Size
5.3 LS, 350
RamblinGMC said:
What wires did you use for power from the original harness?
Click to expand...
Sorry for the late response, I've been working on making hand made leather hats.

I used both glow plug wires, temp send wire, alternator wire, starter wire. Any wire I didn't need I just cut them out.
 
R

RamblinGMC

Member
Joined
Aug 21, 2022
Posts
42
Reaction score
40
Location
Clovis Ca
First Name
Eddie
Truck Year
1982
Truck Model
c2500
Engine Size
6.2
custodian said:
Sorry for the late response, I've been working on making hand made leather hats.

I used both glow plug wires, temp send wire, alternator wire, starter wire. Any wire I didn't need I just cut them out.
Click to expand...
Both glow plug wires? There are 8, green wires. Or did you cut off at the start of where they branch off to 4 on each side and use those? I did not know they were constant ignition power? I want to keep wires intact in case I go back to the diesel.
 
You must log in or register to reply here.

Similar threads

barrymattern
C10 to K20 Body Swap – Driveline Issues
Replies
7
Views
408
barrymattern
barrymattern
D
83 6.2 wiring assistance.
Replies
0
Views
130
drwhys
D
p-a71
5.7 to 6.2 diesel engine
2
Replies
19
Views
2K
p-a71
p-a71
8
Where to buy LS motor?
Replies
14
Views
570
Hunter79764
Hunter79764
Haydenh
Crewcab body swap on Regular Cab C&C 159.5" WB?
2
Replies
25
Views
1K
squaredeal91
squaredeal91

Latest posts

Forum statistics

Threads
42,137
Posts
909,894
Members
33,634
Latest member
prenrag
Top