Hello and greetings from the Great Northwest!: I have a 235 in my 1953 GMC that came out of a 1954 Belair (per the seller). Runs great! But I am getting a high pitch squeeling type noise, on and off (but mostly on). Thought it was front end stuff (belt, water pump, alternator) because it seemed to come from the front of the engine. But today I removed the belt so nothing was turning and the noise was still there. I took off the valve cover to check the oiling. Seems like reasonable oil drippage from rocker arms and shaft. I oiled the whole rocker shaft with a hand oiler very thoroughly and the noise did not go away. I seem to have about 40 psi oil pressure (but I have had that remote gauge for many years and it could be inaccurate). So I don't know. I am hoping some of you more experienced 6 cyl folks might have an idea or have seen this before. Thank you very much! Dave (Snohomish Washington)
