Have lathe. Need specs for making injector bosses. A cad file would be even sweeter as I could plug it into my intake manifold drawing.

 

anybody?

 

We usually make these out of 1 inch bar stock. We like to seal the vacuum side of the injector with a 5/8 ID- 3/4 OD O-ring slid over the nose of the injector body. This will work on any standard injector. You can pull off the stock O-ring and pintle cap. Bore the bar stock to .640-.650, straight through. This allows a slight air gap between the boss and injector to reduce heat transfer and fuel boiling. A .740 counterbore, .040 deep is machined at the end for O-ring retention and sealing. We usually cut off the bosses at 45 degrees so that they are about 1.35 to 1.5 inches long. This is a good entry angle for many injectors into the runner and is an easy angle to saw at.