You can buy really nice O ring seat cutters for the fuel rail that drill the hole, and round the lip all at the same time so the o ring goes in nice...
Before those were available I used to use a drill, then a reamer, then a countersink on the edge.
You can buy "port contour" cutters from MSC to do the ends of the fuel rail so you can use O ring boss style fittings in there which work awesome compared to NPT, but the cutters are a little spendy especially if this is a one off project.
What motor is all of this for anyways?
volkswagen/audi 1.8t 20v guy here! |