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Fully reconditioned and flow matched GM TBI injectors 55pph 5.7L injectors GM injector part # 5235206. Fits 1987-95 GM twin injector TBI motors V6, V8, 2.8L, 4.3L, 5.0L and 5.7L. This is a significant upgrade for your 5.0L motor (305 came stock with 40pph injectors) or your 4.3L V6, is a drop-in replacement for your 5.7L V8. Big upgrade for you 2.8L guys.

Fits the following applications: 1987-95 mid and full size Chevrolet / GMC trucks w/ 5.7L. 1987-92 TBI Camaro and Firebird w/ 5.0L. Caprice, Roadmaster, Astro, Safari, S10, Blazer. Will fit other GM TBI applications, please email if you have specific fitment questions.

This has been fully reconditioned with the following operations performed:

Electrical test consisting of amperage draw test during operation. This is much more thorough than a simple ohm test and no other ebay seller offers this
Injectors ultrasonically cleaned and spray pattern checked
Back flow cleaned to remove any contaminates that can't get past the nozzle....no other ebay seller does this operation
Flow match to within 5% - stock can vary by more than 10%
Injector bodies polished.....please note....some injectors will have discolorations from ethenol use
New injector o-rings and pod gaskets included as shown
At stock pressure, this will supply enough fuel for motors up to about 240hp, or you can upgrade to our adjustable fuel pressure regulator for motors up to 325hp. Please note, the figures below are estimates and will require some PROM work if you have made major modifications to your motor.

run at stock fuel pressure 10-12psi - for 180-240hp motors
16psi - for up to 280hp
20psi - 300hp
25psi - 325hp
If you have done exhaust and/or intake work on your 5.7L - you will want the extra fuel this puts out

This is a stock photo we use for several injector types and your actual product may vary...however, function will be exactly as stated

6. Injectors. GM released 5 sizes of TBI injectors (actually more but those are the important ones) 40lb/hr for the 4.3L and 5L engines, 55lb/hr for 350 engines, 65lb/hr for cop car 350 engines and (80lb/hr and 90lb/hr) for 454 engines. Depending on how much horsepower you make you may need on of the other injectors. While your at it make the regulator adjustable. http://www.thirdgen.org/newdesign/tech/tbi-afpr.shtml Also, consider a new fuel pump FPG001 from www.apeusa.com as the stocker is only good for about 270hp and isn't worth crap. On sizing injectors, most give me all their info and I recommend injector sizing and fuel pressure settings but primarily 40lb injectors are ok up to 200hp, 55lb injectors up to 320hp, 65lb injector up to 350hp and 454 injectors from 350-450hp. Although its hard to make the 450hp with the cam restrictions for speed density fuel injection.

BSFC is the amount of fuel your engine uses to make 1 horsepower for one hour. It is usually between 0.42 and 0.58 at wide open throttle. Normally aspirated engines with efficient combustion processes are at the lower end of the BSFC scale [~0.45], supercharged engines tend to be towards the higher end [~0.55].