Ive got a Nelson tune, 2600k tbtc, stock 3.73 gears, transgo shift kit, built tranny, e-fans, tb spacer (please keep comments to your self on it), aem brute force, asp pulley set, magnaflow big body muffler (biggest case to quite the truck 3'' in and 3'' out) magnaflow highflow cats...

Now with the mods above, and I just got a cam (Vinci truck cam 216/224 551/551 115lsa cam) LT's will be going at the same time...

Would I need 42lb injectors or am I fine with my current 5.3's... Some people have told me I will need the 8.1 marine injectors, and others have said I need the 42's.

 

I would get bigger injectors, stock injectors max out quick.

 

i'd get them. mine are at 97% IDC with similar mods.

 

You would also be fine with the regular 8.1L injectors which can generally be found for half the price of the Marine injectors. They flow ~30lbs compared to the stock 26lbs. If you don't have an kind of FI planned these will be fine.

 

so pretty much itll be safer togo with 8.1 Marine injectors? whats the part number for them? will they go right in besides needing to get retuned?

 

yes to all.

 

someone got some part numbers? i really dont mind going through the dealer since ive got the hook up over there...

 

8.1's would be fine but if you plan on more mods then get 8.1 marines IMO
Nelson has them at a decent price

 

so it looks like im sold on the marine injectors lol...

 

Also check Magnuson. Sometimes they have good deals on sets of those injectors.