I Need to know what size the inj's are on a
2011 Silverado 6.2 L9H flex fuel eng. so i can fix my tune.
9.5 mpg sucks.
also do you think i should swap to a LS3 90mm T/B since i installed a bigger cam ? It has a 87mm now.

The truck has DT long headers,CAI and a 2500 stall, 3:73 gears, dual e-fans

 

You can find a 2011 6.2 V8 tune on the HP tuners repository and get you injector information straight from there. That would be the easiest way because everything you need will be there.

My personal opinion would be if you can't outflow the stock size TB yet, don't upgrade but that's just what I think.

 

I don't have HP Tuners, I can't get in. I am trying to get the info for my tuner.
to make things go faster. we think they are 38.5 lbs

 

If I am reading right and doing the conversion right they are 43lb/hr at 3 BAR and 50lb/hr at 4 BAR.

Stock 5.3 flex fuel injectors are 33lb/hr at 3 BAR and 37-38lb/hr at 4 BAR.