Determining Injector size... (1 Viewer)

[Tigerstripe40]

OK, so I picked up a Throttle body from a TBI chevy motor a few days ago, and I have rebuilt the unit.

I have NO idea what it came off of. There was a large pile of TBI units sitting in a pile at the wrecking lot. I just grabbed the one that looked the best (and honestly, it wasn't a very good unit).

I have no idea if it came from a 4.3, a 5.3 or a 5.7 liter enigne. I am pretty sure it came from one of those (and is not a big block TBI). When I pullled the Injectors out, the filter on teh bottom was a rust color. The electrical leads are red.

How do I determine what size injector I have?

Thanks!

 

[Niner]

I could be wrong but I believe that the 4.3, 5.0. and 5.7 all share the same injectors. Only the big block is differant.

Howell

It won't link directly but go to parts and accessories/tbi parts and they show them all at 500 cfm.

 

[Rock Taxi]

GM TBI Injectors are color coded. What the coding convention is, I cannot remember, but they are different for each displacement motor.

I can look tonight but you might find the info via a google search.

Ed

 

[theo]

Only been reading some on TBI, no real experience. Take a look here:
GM TBI tuning tips
Looks like several possibilities.

 

[cruiserrg]

These injectors are rated at the pressure used by the factory, about 13 PSI Application Throttle bore size Injector color code Flow rate Part #
2.8l v6 1-3/8" Black/White ??? GM 5235430
4.3L 1-13/16" Yellow/Blue ??? GM 5235203
5.0L 1-13/16" Green/White 40 lb/hr GM 5235279
5.7L pickup 1-13/16" Orange/Black 55 lb/hr GM 5235206
5.7L Cop Car 1-13/16" Yellow/Brown 65 lb/hr 17084327-ACR
Late big block pickup 2" Blue/Black 80 lb/hr GM 1708430 big block pickup 2" Dark Red/Dark Blue 90 lb/hr GM 5235231

From here: http://groups.msn.com/AutoTechsOnline/knownfixesforgm.msnw