First throttle body. I have heard we can use different throttle bodys for our cars. Which ones and where can i get them? and are they worth it?

Next i have stage 2 on my car with the 42.5 injectors. if i have it like that, do i have to buy the harness to step up to the 60's? (sounds dumb to ask but really dont know) Thanks

 

You can use the LS4 TB, its bigger. Factory equipment on 4.2L I-6s in the trailblazer, also the 3.5/3.7L I5 in the Colorado/Canyon/H3 chassis. Search LS4 TB on here, there is a lot of info both good and bad.

GM stage injectors use the factory harness, so you will need to buy a harness with aftermarket injectors.

 

^^on the ball.....good advise.

 

Agreed. Thanks alot man>

 

No problem

Glad to help. Feel free to ask if you have any other questions.

 

its also standard on LS4 cars.

 

True, just listing some of the other options that I had looked at way back when I first tried it. Doesn't have to be just an LS4 motor, any of the inline truck motors have it.

Actually, the I-4 Colorado motor has it as well, but its slightly smaller I believe. Not sure if its still bigger than the LSJ or the same, but it might make a nice middle ground if it is a middle size.

 

you dont have to replace the entire harness to use 60# injectors. you can use the pigtail connector clips that splice in the stock harness in place of the factory injector clip.

coincidently i have some for sale