Question on plugs for dart 320 heads
I have a set of dart 320 heads and plan to put them on a 509 dart block. The dome on the Ross pistons I have could hit the plugs. I was told to run an Autolite 23 plug. This plug has a short projected tip. What plug would work better and offer more clearance? Someone sugjested Bosch +4 but I don't have a number for the plug.
Thanks Steve