I raced the MEL engines from 1958 to about 1962 and used many blocks. I ran unblown, blown, gasoline, nitro and some stuff i won't mention. The 58 to 60 blocks have the older all the same size cam bearings. The 61 to last year used the varied sized cam bearing. The outiside specs of the cam bearings were larger as well as the inside spec. To my knowledge there was never a set of cam bearings made that would put the older cam in the newer block and you certainly cannot do the reverse due to size. However, we solved cam walk the easy old fashion racer way. We used a spring and a button to hold it in. This pushed against the cover. It only takes a little pressure to hold the cam in. If you are using a flat tappet cam (solid or haydraulic) there is no need for this. Normally the cam will not walk much.
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