Here is my question for the day. I have located an old GMC farm truck, that has in it what I think is a Chevrolet 261. On first inspection, I noticed that the valve cover has the two grooves running the length of the valve cover. I have only seen those grooves on the 261's. Is that assumption true that the grooves are only on the 261? On my next trip I will take my camera and take a few pictures to post here. I will need to take a broom to brush off many years of dust and spider webs in order to see the area where the captain bars should be located. Pictures will come later. Maybe I have located a 261 and maybe just a 235? It is a later full pressure design engine, I do know that.
Al
Alan