I have a 1970 350 small block which has loud tappet noise between cylinder 1 and 3. My chioces right now are, option 1, to replace the lifters and attempt to break in the new lifters with the old cam. The engine has approxmately 300 miles on the rebuild but has been sitting for some time. I was told by a mechanic that you should replace both cam and lifter as a unit because they both need to be broken in together. Is it really necessary to replace both cam and lifter together? When pull the old lifters out what should I be looking for? What are my changes that a new lifter replacement will do the trick?

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