is a 5.3 out of a truck the same wiring harness as a ls1? if not what is the same as an ls1???

 

i know that the injector plugs are different but those can be changed over to suit.

I beleve there are other differences as well, so, is it the same? No. Can it be made to work? I beleive so.

 

do u know how i could find out what all is different b4 i buy?

 

The PCM location is differant, which is a major differance. The truck harness has the PCM located on the drivers side front. They way the O2 sensors are routed is differant. The harness is made to go across the top of the intake. The alternator ans A/C compressor are in differant locations on the truck motor, so those plugs will be located differantly. The map sensor is located differantly. The MAF on the trucks is a 5 wire one with a built in IAT sensor, I think the F-body uses a seperate IAT sensor, so the MAF plug would be 3 wire. I guess just about everything is differant, but you can make it work

 

would it be work building a 5.3 or is a ls1 a better build?

 

Depends on what car its going into, your budget, goals etc. Sometimes the truck motors are better, but depending on space the LS1 may be better.

 

well i have room...n i want to boost it one day but thats far in the uture. and is going in a 02 wrx which a lot of people on here think isnt real but it is very real

 

Personally if I was going with boost, I'd use an iron truck motor.

 

You most likely will one a Iron block if your going to boost or juice it..

As far as the Wiring, it will be some work, but if you have all of the pinout diag.. and the time, you can pull apart the harness and re-route what you need, add and delete any item as required on your swap. You might just continue to research on the wiring and PCM question. John at Speartech or Jesse at Wait4meperformance and many of the other sponsers can help. Might post some PCM question in that forum.

Good luck.....

 

see i was wondering bc the wiring for the ls1 is already spliced into the Subaru. i can drop a ls1 in it and start it. but i was wondering if i can do the same with the 5.3 with little work