Big Twins 1954-65

These threaded steel bungs are 3/4"diameter and are drilled and tapped all the way through with 5/16"-18 thread

putting it in just the right spot to run the spark plug wires clean and easy

and offer an accurate oil pressure reading on your Harley-Davidson or other motorcycle

This black aluminum gas cap is a dome top

Linkert Intake Leak Tester - 4 Bolt Inside Diameter_1" Big Twins 1954-65This tool from Unity Manufacturing makes testing your intake tract a breeze. Simply bolt this to your intake manifold, make sure your intake valves are closed, and use a bicycle tire pump or air compressor regulated down to 10 psi. Spray the intake gasket area with soapy water and look for the bubbles. Readjust your clamps and repeat until you dont have any leaks, then bolt your carb on and go! Made in USA.