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Here is some information I have compiled about injector flow rates and mass airflow sensors and PCM's from various LS1 and Vortec vehicles. Use this information at your own risk. If you can verify this, let me know. firstname.lastname@example.org
MASS AIR FLOW SENSORS - GM used various sensors across its vehicle platforms. The 99+ Vortec trucks used a 5 wire sensor with a built in Air Temp Sensor. The LS1 Camaro/Trans am had a 3 wire sensor, with an external separate air temp sensor. Also note that the Vortec 5.3/6.0 engines from Express Vans had a much smaller mass airflow sensor.
In the above table, I have just used reference points to note the differences in the sensors at a set frequency. It is possible to use ANY mass airflow sensor on any engine, however the PCM needs programmed with the correct MAF calibration data.
FUEL INJECTOR FLOW RATES - GM used various different sized fuel injectors across engine sizes and vehicle platforms. I have compiled this data from looking at many different calibrations. GM also changed the style of fuel rail from a type with vacuum referenced regulator, supply and return lines, to a return-less system without a regulator in 2004 for all Pickups, SUV's and so on. The ONLY exception, is Flex Fuel 5.3L (L59 Vin Z) kept the return style rail for model year 2004, and in 2005 went return-less.
25317669, 25320287 - 1999, 4.8L and 5.3L - flows 2.742 gm/sec or 21.8 lb/hr @ 58 psi
25317670, 25320288, 25323974 - 1999-2000 6.0L, 2000 4.8L and 5.3L - flows 3.125 gm/sec or 24.8lb/hr @ 58 psi
25317628 2001-2007 - 4.8L, 5.3L, 6.0L - flows 3.180 gm/sec or 25.2lb/hr @ 58 psi
25326903 - 5.3L L59 Vin Z, flex fuel 5.3L - flows 4.164 gm/sec or 33lb/hr @ 50 psi
12554271 - 1997-1998 5.7L LS1 - flows 3.727 gm/sec or 29.6lb/hr @ 58 psi
12555894 - 1999-2000 5.7L LS1 - flows 3.438 gm/sec or 27.3lb/hr @ 58 psi
12561462 - 2001-2004 5.7L LS1, LS6 - flows 3.781 gm/sec or 30lb/hr @ 58 psi
PCM SERVICE NO. USAGE - This will list the service number printed on the PCM that I have come across. This should pretty well complete any PCM you'll see 1999 to 2007 for Pickup trucks. Some PCM's will work with cable thorttle, these will have a ( ** ) next to the 8 digit number. These PCM's that work with cable thorttle were for sure in Express Vans 2003 to 2007, V6 4.3L Pickups, and in 2004, GTO's with the 5.7L LS1.
09354896 - Used 1999-2000 in Vortec Trucks, Blue & Red Connectors, F-Body, Y-Body
12200411 - Used 2001-2002 in Vortec Trucks, Blue & Red Connectors, F-Body, (to 2004 in Y-Body - so I've read)
All 2003-2007 PCMs have Blue & Green Connectors. (** WILL WORK WITH CABLE THORTTLE)
12576106**, 12581565**, 12582605 - 2003 Vortec Truck
12586242, 12586243** - 2004 Vortec Truck
12589462**, 12589463 - 2005 Vortec Truck
12602801, 12602802** - 2006-2007 Classic Vortec Truck