I removed the 235 head from the 1953 hydraulic engine --head number was xxx5913 -- engine may have been rebuilt in its life or maybe a valve job, dunno, but not lately. Very carboned up. I will cleanup the pistons and the head surface. I will use the 261 head which had been refreshed. I have 6 stubborn lifters to remove yet including both of the collapsed lifers #4 and #11 from front. Some lifters had been replaced. I willl replace all as I have a new gimme set of hydraulics for a 235. Lifter wear seems negligible on old and new --maybe a stove bolt thing.
? Will a 216 intake and exhaust manifold interchange with a 235? Gaskets seem to match.
Also I will run a hotter plug when I figure out what one is.