how much can i spray in my stock 03 silverado 4.8?

 

i would not go any more than 150. thats just me. on the safe side
seth

 

I have seen a cammed LS1 fry a piston with a 150 shot. He needed bigger injectors to accomidate a mild cam. He blew a hole in #8. On his last car he also had a 300 shot on a stock rotating assymbly on a WS6. It still had good compression when he sold it. If you are stock then i would say go with a 150 shot but use it sparingly. If you are gonna cam it go with a 100shot. JMO. good luck, have fun, kick @$$!!

 

I would say 100-150 shot and you will be just fine and with a wet shot you don't need bigger injectors. Get yourself some TR6 plugs and if you are planning on the 150 I would upgrade your fuel pump, but that is just my opinion, nothing wrong with making sure that you have enough fuel.

 

Deckhand sprayed a 125 shot (rich jetting) on stock fuel pump/injectors on his 4.8 - ran very low 13's on street tires. 150 needs new fuel pump and/or injectors IMO. Have fun.

 

To keep it running and reliabnle I would go with a 100 shot I sprayed that on my 165,000 miles 5.3 and didnt have any problems till I pulled the heads and I think I left some trash in tehre or something.

 

Wet or dry?