Port size rpm performer manifold question
I don't own a Ed rpm, but I betcha it's 3/8 NPT. On my Speedmaster intake, the hole in that location is 3/8 NPT. Hole on PS next to thermostat housing is 1/4 NPT (on SM intake )which is what I used for my 1/2 heater hose. Hole next to it is 1/8 NPT, which I used for temp gauge. See pic :
I don't own a Ed rpm, but I betcha it's 3/8 NPT. On my Speedmaster intake, the hole in that location is 3/8 NPT. Hole on PS next to thermostat housing is 1/4 NPT (on SM intake )which is what I used for my 1/2 heater hose. Hole next to it is 1/8 NPT, which I used for temp gauge. See pic :