The inlines all came with 1.75 ratio rockers with small holes in small fulcrum balls. The big blocks use a 1.70 ratio, larger diameter studs and larger balls. Unfortunately, there are no interchangeable parts from one type to the other. If you put in the big block studs, and want to use a stock rocker, you will have to use the entire assembly from the big block also. And there isn't much room between the rockers anymore when you do that.
Most times on these engines, the builders use roller rockers when going with the larger diameter screw-in studs.
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David
newbie #4153
