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6.5 out of 94 in 83

Landon730

Active Member
Messages
216
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125
Location
Greenwood Arkansas
I have two trucks, the 94 is a parts truck and the 83 is my daily. I blew the head gaskets on the 83 the other day and I'm not sure what shape the motor is in. It overheated BAAAD. I know that the motor in the 94 is a awesome motor. My concern is I need this done in 1-2 weekends. Will the tranny in the 83 work with the 6.5 out of the 94? I already know the turbo won't because of A/C. I did hear one time about the stuff for A/C off the gmt400's work in the squarebodys? Keep in mind I have a entire parts truck here. Both a auto trannys 2wd. I need a list of anything that could go wrong. Manifolds off of 6.2 and intake are going to go onto the 6.5 unless I can make the turbo work which would be AWESOME
 
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3,750
Location
alaska
AC is the killer for turbo installation from what I've heard. Only other issue I can think of might be oil pan but you have 2wd so I don't think it's an issue
 

Landon730

Active Member
Messages
216
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125
Location
Greenwood Arkansas
The tranny is my main concern. I can use all the old accessories and the old manifolds and intake unless I can make the serpentine work (which would be awesome) . Will the oil pan off the 6.2 bolt onto the 6.5? Heres my list of concerns right now. I have to have this truck going in max week and a half working around school
1. Tranny
2. Oil pan
3. Torque Converter
4. Bell housing
 
Messages
13,434
Likes
3,750
Location
alaska
Old tranny should bolt right up
Oil pan should be fine. Old oilpan won't fit new engine, different crank seal
Use the old torque converter
Bell housing is the same
 

WarWagon

Well it hits on 7 of 8...
Messages
8,713
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3,456
Location
AZ
Oil pans have different rear main seals and drain plug is on other side.

The heads have different injector angles so decide now if you are running 6.2 long body or short 6.5 injectors. you are screwed either way as DS4 lines don't work on DB2. You can bend the 6.2 lines, but, will have to measure if long or short fit better with the head angles.

FWIW you likely cracked a head on the 6.2.

I have bolted many 84 85 6.2's to 1993 and 1995 trucks. Watch the oil cooler ports as the have different sizes for some years.
 
Last edited:

1999gmc

Active Member
Messages
305
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78
Location
Carmichael, CA
Not to hijack your thread, but I am wanting to basically do the same thing in a K5. Anyone know how tall the center mount turbo mounts are? What about running center mount and a cowl hood?
 

1999gmc

Active Member
Messages
305
Likes
78
Location
Carmichael, CA
A custom centermounted ATT or the like, ok. Stock gm centermount- why? It’ll probably be the weekend, but I can measure mine for ya.
Well I thought serpentine setup got in the way of using the 6.2 turbo manifold and using the 6.5 manifold makes the turbo or downpipe hit the evaporator box. So was curious if anyone has looked into doing a center mount 6.5 in a square body. Center mount are different heads though, yeah?
 
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