P4120701 Small Block Mech Tach drive

I am thinking it is frozen or welded. I am looking for one for my 440 they just have great characteristics.


I might have one for a 440, I had 3 a couple years ago. I put one in my buddy's 500 cu in motor and I know I sold one maybe both I have to look, That's the only dist I been running in my 340's for years. They have that bearing in the top and never get sloppy.