Gentlemen,
I am seeking your advise on this problem after trying a few fixes on my own without any success.
I recently bought a nice 56 KHK that ran well but had a bit of a hiccup in the mid range, the previous owner warned me that there may be an intake vacuum leak so he was honest with me so I have no problem with him so no bitches about him. Having never owned a flat-head before or even a Harley for that matter I set up the pressure test setup seen on a few web sites and tried the test at 10-15 psi and sure enough leaks around the intake nipples and nuts. After pulling everything apart re assembling with peek bushings I still have leeks and it seems like the pipe nipple threads in the cyls are the problem. I am open to any suggestions, help.
Gary