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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.  lt1swap@centurytel.net

 

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. 

AC DELCO GM PARTS DIRECT.COM        
PART# PART# DESC 3000HZ gm/sec 6000HZ gm/sec 12000 HZ gm/sec
213-4221 15926193 express van 03-07 4.8/5.3/6.0 4.961 39.492 361.695
213-4160 15904068 silverado 99-07 all engine gas 8.063 55.016 453.688
" " avalanche 02-06 all engine gas " " "
" " trailblazer 5.3l  " " "
" " corvette ls1 01-04 " " "
" " corvette 6.0L 05-08 " " "
" " hummer h2 03-06 " " "
         
213-353 25179711 camaro v8 ls1 1998-02, corvette ls1 97-00 10.43 63.875 439.203
213-1150 25341604 corvette ls6 01-04, ssr 03-06 8.383 56.398 470.828

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

L59 VIN Z 5.3L FLEX FUEL INJECTOR

NON FLEX FUEL INJECTOR

 

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