[RICK LAKE]

bobcowan Bob good luck. Even GM doesn't know the flow rates and size. Best bet is this, they are universals because of the 2 ways to mount them on a manifold. You can screw them into a bung or press them in. There are a couple of injector cleaning companies and they can clean them, flow rate them, and rebuild. If you want to stay with them and the car is running good, stay with them. The other issues are if you switch to another brand of injector, make 100% sure you stay with the same OHM readings to match your system. Injectors have all different drivers in ECM , PCM, ICU, or just brain for them and you must match systems to work. INjectors can run as low as 2 ohms or as high as 40 ohms. Look for cleaning shop first. If you google and nothing shows, e-mail back, I can call a parts tech at GM Rick L.