I know a lot of the old ones didnt have a muffler tap from the factory and the more modern ones come with a pressure tap on the exhaust adapter. I dont know why you would NOT want to use a pressure tap even with good fuel draw. Both of my .65's have pressure taps. I only run one of them right now and I use the pressure line. I'm hoping I'll be able to get one to run with the tank under the engine.




About 15 years or so ago I drilled and tapped the muffler extension of my 65 sportster for a pressure tap nipple. LaterI had to sendit back to K&B for some minor issue and when I got the engine back the technician included a note which emphatically stated not to use a pressure tap. I thought the engine engine ran well with it.