This top motor mount has mount for stock EFI ignition coil (Note: this is designed for stock fuel injected coil)

All of these issues cause air to leak past the slide

coped steel bungs are 3/4" diameter and are drilled and tapped with 5/16"-18 thread

When fabricating a custom exhaust for your next Born Free Shovelhead Chopper you will definitely need a set of these

It includes all the o-rings

#2675-20 Footboard Mounting Kit 1936-1954 Harley-Davidson Davidson Big Twin - Parkerized Bung Type_Full Radius This top motor mount hasParkerized studs, washers and nuts used to mount footboards on 1936 1954 Harley Davidson Big Twins. Made in Ohio, USA.