I can't find anywhere that sells a efi gmpp single plane for ls1/ls2/ls6 heads. Does anyone know where to find one or a part number?

 

I googled "gmpp single plane" and this is the first option that came up...

Chevrolet Performance 88958675
LS2-LS1-LS6

-Single Plane
-Cathedral Ports
-4-Barrel Carburetor
-4150 Carb Flange
-Bosses for EFI injectors/custom applications
-Bolts and instructions included

 

So they do not make one for efi it has to be machined for it?