[jessrayo]

It varies with the dyno. My 2016 could only make about 560 whp on the dyno with a stock fuel system. I picked up about 100whp just upgrading the low side pump. I expect you will do the same.

If you change the piston to one with lower compression you will be able to give it more air and fuel. With the stock 11.5 to 1 pistons I really couldn't use the extra fuel the LT4 pump and injectors could give me without running race gas because we were starting to get knock on pump gas.

If I was doing it all again I would stay with the LT1 pump and injectors, add the cam and low side pump, and then add the port.

The only question I have based on your comments is regarding the max flow of the ZL1 pump. I don't know how much total power that pump can support. It may not have enough volume to do the port system when you get to that so if you may need more fuel pump. It would be better to start with a low side pump that can handle your overall horsepower goals.

I think I'm on the 3rd fuel pump upgrade in my 13 ZL1 and right now it could make more power if I had a bigger fuel pump.