This video demonstrates an advanced gunsmithing technique for machining a dual spark plug hole into a Harley-Davidson Shovelhead cylinder head using a milling machine. The process involves precise alignment, controlled milling with an end mill, drilling, chamfering, and finally, tapping the new thread. The instructor emphasizes the need for practice and careful pressure application during threading to avoid damaging the head or the tap. The modification aims to improve combustion efficiency.
You've reached the end! 1 videos loaded.
Gun Laws by State
Read firearms regulations for all 50 states + D.C.
Find Gun Dealers
Search licensed FFL dealers near you.
