I under stand that the rocker arm ratio was changed in the early 70's from 1.6:1 (1968/69) to 1.54:1. I need a set of rockers for my 68 350 cid, and want to get the same as is on it...

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gi42

I under stand that the rocker arm ratio was changed in the early 70's from 1.6:1 (1968/69) to 1.54:1. I need a set of rockers for my 68 350 cid, and want to get the same as is on it now. Is this true? If so what year range can I buy to get the right ratio?
Thanks
Bernie Newton

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