blue2003ls

iTrader: (11)

I think I want more boost. What can my stock 5.3 handle with pump gas? 91octane is about all that can be found around here. I currently have a 160 deg t-stat to install and two smaller pulleys, a 3.0 and 3.1. A new tune is a given but is there anything I should consider when swapping pulleys?

brobradh77

iTrader: (3)

91 Octane..ouch that sucks IMO. Your running a 3.4 now so ya a tune is all i would worry about at the moment. I dont see that your running a cam or anything that would maybe suggest upgrading injectors.

blue2003ls

iTrader: (11)

44lb injectors may not feed it? What would be next in line, 50lb injectors or is that pretty marginal as far as improvement?

Last Call

iTrader: (4)

I ran a 3.1 with my old 5.3 and it was fine. It was about 9-9.5psi. I would start with a 3.25 or the 3.1 you have now and go from there.

Last Call

iTrader: (4)

I think you will be okay with the 44# injectors with the 3.1 pulley. Your IDC may get up into the 90's though. I would buy a methanol kit before larger injectors. The meth will keep your intake charge cooler and add octane so you can run a smaller pulley without detonation. IMO

blue2003ls

iTrader: (11)

I know I should have bought the Snow Methanol kit with it.

trever1t

iTrader: (14)

I see you have the pulleys ready. I would also go down to the 3.1" and see how it is.

BlownChevy

iTrader: (20)

3.1 will be about 10.6 psi

trever1t

iTrader: (14)

You're such an optimist BC.

With excellent tuning these engines seem almost indestructable...knock on wood

blue2003ls

iTrader: (11)

So would good tuning and meth solve this or do I need more?

Now you jinxed me.