Do I need larger injectors?
 

I have a 5.7 ls1 with 243 heads and a custom cam. Cam is low duration, specd for truck use. Im using my stock 2003 4.8 truck intake/exhaust/tb/maf/injectors.

I think my stock injectors are 26#. With the stock intake and exhaust, I expect to make around 330-350whp through the auto. Stock converter and limiter.

Will these 26# injectors support my fueling needs?

They should be... I think my '00 5.3 has only 19# stock and with my current setup they are running at 93-95% IDC peak. So you should be good, but only one way to really know for sure!

If your 19s are maxed at 300whp, my 26s will probably be maxed at 330-350whp. Duty cycle shouldnt be over 85% right?

Ideally yea no more than 90% but I have no issues. Im also right around 330hp now with a good tune, LTs and ory.

And I could be wrong about what size my stock injectors are. If mine are the 24-26# injectors then you might want to look into some in the 30something range.

Thats good news. I should be good then. Thanks