"My question is what is the proper rocker set to use with this 1958 block with the 1/16" orifice, mine had the later versions with the oil groove offset but they were also worn out so perhaps that's why? My thinking would be to use pre 58 rockers but I would appreciate it if someone with more experience and wisdom could give me a yay or nay."
1954-58. The top half of the picture. Some parts made between 1950 and 1958 can be used but I'm not going to expand on that. One way to differentiate is by looking at the oil collector. Unfortunately this is not 100%. I have seen rocker arms mixed. Some old style oil collectors crimped on top.
A common history is that, over many years, sludge builds up in the tubes and passages and eventually blocks oil from making it to the rocker assembly. Back in the mid 60's I remember a old farmer was fussing because his engine was making a racket. Ed, the mechanic, pulled the valve cover off. He shouted well no wonder, it's bone dry. Ed cleaned up the oil returns and poured oil over the rockers. It was not as noisy as before but still no oil was making it up to the rocker assembly. Ed told him how much it would cost to fix the problem. The farmer laughed and said, nah. I'll drive it like it is. You can bet the farmer kept a can of oil in his truck after that. These old trucks were mistreated in the worst way but they kept on running.
Last edited by buoymaker; 03/28/202211:57 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
