The 216 valve covers have 2 acorn-like nuts sticking through the top on studs. The 235 cover has 4 machine screws at the bottem flange in threaded holes in the edges of the head. 216"s are no good if you expect high rpm and high speed on an old engine. 216"s were in deuce & a half ton trucks during WWII. With a little knock or a drop in oil pressure the babbit bearings could be, " taken up ", by removing shims and would compensate for bearing wear, keeping the engine in-spec and running for a long time to come. I"ve had both and still run a 216 in a "46 half ton. 235"s became more popular, I believe, because of the ease in changing bearing inserts. Both engines had the oil filter canister...as an option. The biggest draw-back to an older 216 or 235 was the relatively long piston stroke which lead to greater cylinder wear than a shorter stroke engine, which lead to greater oil consumption and shorter engine life between rebuilds.
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