Mopar M1 Manifold Injector Bosses, Not Drilled Out
Its just an EFI step bit and a drill press. you can do it. Its not needed to be CNC accurate as the injectors float on O-rings and can tolerate some slop. The O-ring ID is 14mm and a 17/32 (13.49mm) drill bit can be uses to drill the through hole, then drill that out to 14mm to make a step for the injector to seat into. Dont 14mm drill all the way, just deep enough to make a nice step seat. I did it to some 3/4 OD AL thick wall tubing and made a bunch of injector bungs for my slant head. Someone over on Slantsix was loaning out that bit, but if you had a machine shop buddy, I bet he could chuck a 14mm in a lathe and use a carbide cutter to step down the tip to form a MSD 2160 pocket cutter for less than the $130 they want.
Its just an EFI step bit and a drill press. you can do it. Its not needed to be CNC accurate as the injectors float on O-rings and can tolerate some slop. The O-ring ID is 14mm and a 17/32 (13.49mm) drill bit can be uses to drill the through hole, then drill that out to 14mm to make a step for the injector to seat into. Dont 14mm drill all the way, just deep enough to make a nice step seat. I did it to some 3/4 OD AL thick wall tubing and made a bunch of injector bungs for my slant head. Someone over on Slantsix was loaning out that bit, but if you had a machine shop buddy, I bet he could chuck a 14mm in a lathe and use a carbide cutter to step down the tip to form a MSD 2160 pocket cutter for less than the $130 they want.