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I was going to use 455 lifters and pushrods. I have a set of rockers on a shaft but I dont know what they came off of. They have a casting number, but I dont know how to identify them. All of my stuff came in boxes.
If you use 455 lifters and push rods, you need to block off the passages in the block and heads. The 455 oils through the lifter pushrods. Post a picture of the rockers, pre 70 rockers are markedly different in appearance.