Originally Posted by jwikoff99
If the stock Series I pump is good to 390, how good is a new replacement? I know they are not the same exact pump.
I have no clue what the new GM pumps are. And it may not be possible to find out unless we buy a couple pumps and flow test them.
DrJay'* information on the flow of the Series1 pump comes from a reliable source. We've backed it up, too. His car was built for 350hp. With the 2.2" pulley on it at WOT, and over 100k miles on the stock Delco pump, he'* not going lean. It'* supporting him just fine, and stock injectors, as well.
Project, you really need to locate that pump and maybe even pull it before we can research fuel pump options for you.