After looking in my 1961 Chevrolet master parts catalog I found the cap cujo needs.Catalog says the cap fits 1956 to 1962 235 and 261 engines.When i first read his first post,he said it had a tapped hole in it.Reading that i assumed he had a 1954 or first series 1955 engine.There is no reason for that hole to be there after 1955 and up passenger car engines and second series 1955 and up truck engines.I also informed him about needing to line bore the engine and suggested he install studs in the block,instead of bolts for the main caps.I also located the correct cap with the part number he requested.Maybe someone could help him find a set of studs to mount his main caps.Somebody must be making and selling them for old Chevy sixes.The newer main caps that are drilled still has me puzzled.Maybe military stuff?
EvilDr235

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Two types of people drive old cars.Rich people because they want to and poor people because they have to.
Remember EvilDr235 has a cure for Your sixness.