I have a 235 for parts .. it had a weak cylinder.

Wesley, if you want to get far more oil to both rocker shafts in general, here is an old trick. That oil connector pipe that comes up from the block, that then goes into the center of where both front and rear rocker shafts meet, that then goes back into the block to drain. This pipe crimp it to not allow it to return back into the block. Obviously you have to crimp the side of the pipe that is returning oil, not feeding it oil. What this in turn does is allow all the oil to be fed to the rocker shafts and not just partially. Then the oil returns into the cylinder head drain holes. I have done this to every 235/261 inline six that i have ever owned and swear by it. Obviously GM not doing this in the first place is what caused premature wear of the rocker shafts, as well as the rocker arms. These photos show what it should look like crimped and this is on a 261 in liner in my 57 Pontiac.Try it you will like it. Cheers. George

Wes, the valve train parts are the same between the 235 and 261. As you might already know it is the 216 that you would stay clear of. It looks like Rocker arms unlimited has the complete assembly rebuilt but they need your core. This is good to know for future reference. Good luck. George

Wes, in case you have not done this already. Also makes sure the hollow rocker shafts are perfectly cleaned out with a pipe brush and solvent. Also clean out with a smaller pipe brush, all the oil feed holes in the rocker arms. I have always used 20w50 or 20w40 in my old inline sixes. These motors had loose bearing specs compared to what motors became later. Obviously these oils would hurt the motors if you ran them in colder temps. I run my in liner from May until storage in October, so this heavy oil is not an issue. Continued good luck with your 62 261 in liner. George

drae_man wrote:

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I have a line on a 235 from a 65 chev Biscayne, is that valve train ok to use being 1965??? I hope!

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 Wes, a 1965 Chev would not have a 235. The 235 was last used in 1962 in the Chevrolet line. As of 1963 the Chevrolet in line six was of the new generation of motor, which had a V-8 type of valve train with individual rockers. You can use valve train parts from a 235 or 261 from 1955 to 1962. Cheers. George