No. Smaller. Would cause issues I assume. Now if u had a tweacer or something and a lot of spare time I bet u could make it work but it'd just be easier to pu some 24's out of a junk yard.
either way the programming is the same so they should be interchangable with the 19s regardless , the computer should be able to compensate any difference in just the 2lbs difference regardless if they are 19s or 21s
Pink are 19lb an blue are 24lb now thats a Ford Racing Injector?? So if stock an pink ther 19's. An you can run 24lb injectors with a cal. Massairmeter. Runs great on mine?? Run High octane gas though always
this site says 21s , but again , doesnt matter , injector slopes wont make a difference in 2lbs increments the computer has enough self adjustment to compensate , so end result DOESNT MATTER .......they will run in place of 19s all day long ....