I need to drop my axle to do suspension work anyway and I plan on putting in a bigger motor soon than my 350. I have the intake and injector for 650hp on the next motor, so to future proof the car I was thinking about the aeromotive stealth 340LPH, but I don't want to deal with upsizing the metal lines. Can I get away with 340LPH in the stock lines for a while on a motor that only makes 350-400hp or do I have to use the Walbro 255 for the time being until I bother to put new lines in?

 

the stock 3/8 lines can feed 1100 hp

youll be fine

 

In theory yes but isn't the stock return only 5/16"? I imagine I would have a problem trying to flow that much fuel back to the tank with the pump being wildly oversized.

 

I have aem 340’s in my tank, basically directly replaced the walbro 255’s i had.

 

On stock fuel lines at EFI fuel pressures? Sounds like I have nothing to worry about as long as I have a good pressure regulator!

 

I have the aeromotive stealth 340L/hr. It's been great. It will feed up to 750hp if your na. I'd recommend having a return line that matches your feed. The smaller return can cause you pump to run hot.

 

a 340 on stock lines should do what you want on gas.