This is an Edelbrock Victor 351 intake I modified for fuel injection. I used a center-cutting end mill to cut straight down through the runners, then installed prefab Kinsler injector bungs. The wood and bolts hold the bungs in alignment for welding; they were about .740 OD and the closest end mill diameter was .750. I just did the bungs and farmed out the TIG work. The owner ground the insides of the runners where the bungs projected and fabricated the fuel rails. The manifold came out quite nice, and wound up wearing a Force Fuel Injection four barrel throttle body atop a 430 Windsor stroker.



The Kinsler bungs were about $7 each. They worked fine, but after playing with the injectors for a while I realized straight pieces of tubing would work just as well. Many OEM intakes have simple drilled holes, much less elaborate than the multiple diameters, tapers, and chamfers in some of the aftermarked bungs!



You can see where the "injector bosses" were on the intake. They're not even approximately large enough, nor are they in the right places. Note the injectors are standing straight up, ie 45 degrees from the runners. They can't be leaned or "aimed" at the port any better without running into the throttle body. Many Ford and Chevy applications spray directly on the opposite wall of the port anyway, with no attempt at all to direct the spray down the port. I adjusted the left/right spacing to try to aim the injectors as close to the centerline of each port as I could, the spacing at the fuel rail wasn't even. No problem with a custom rail, of course.

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