Quote Originally Posted by scottvancil View Post
... Do I need to install bigger injectors and if so what injectors, brand and part number, should I use?... .
U might wanna create a new post, you'll get more answers.
Depends on how much HP your engine is making.
If it's all stock, with light bolt-ons, the stock ones will be fine.
IF your setup has a cam and headers, maybe a set of 8.1L 30lb inj and a walbro pump will be good enough.
Heads/cam, etc, you'll need 42's.

Quote Originally Posted by sloCaddy View Post
what years, or how would I tell if I have the bigger flex fuel injectors?(probaly dont) There is a sticker on the inside of my fuel filler door with an icon that shows E85/unleaded, doese that mean anything? I thought that flex fuel motors were later 2000''s ? mines an 03 5.3.
I need to post up pics of various injectors and descriptions, but if they are the typical truck style connector that almost all 99-00 trucks are equipped with, they are probably 24lb'ers.
The flex fuel inj have that little square connector.