93 4.3 TBI in a 90

[martimagico]

Hello all,

I have a problem that I can't find an answer for.....

I own a 90 single cab SB chevy with 4.3L 5 speed stock. I am keeping the 5 speed tranny.
The motor has completely ****.
I bough a 93 gmc single cab LB with 4.3L auto OD stock.

although they look identical, there are a few things I noticed....
1. the spark gap is different the 93 has .045 and the 90 is .035
2. the replacements for computers and long blocks are different part #'s on O'reillys

these are both 4.3 TBI Z code vin without balance shaft.

My questions are:

1. do/can I use the 93 computer with the 93 block in the 90 truck?
2. can I move the 93 motor straight across to the manual truck from the automatic?

Thanks in advance!!

 

[Gramps]

Use the computer that’s in your truck now (the 90)
Use the 1990 throttle body.
Only thing you need to do to the 93 motor is install a pilot bushing/bearing in the crankshaft.
Use either gap as long as you use the same on all 6 plugs.

 

[martimagico]

Thanks!!!

The pilot bearing is for the tranny right?

 

[Gramps]

Correct, for then input shaft of the trans to sit in.

 

[martimagico]

Thanks Gramps!!!

 

[martimagico]

More questions to follow