Anyone use speed master roller rockers?

fishmens67 said

I have a set of big block Speedmaster stainless, they have bronze bushing, identical to the PRW except for the roller axle.

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There's some that look like a knockoff of the prws that have no bushing at all. I have some . Never used'em. Used the Chinese needle bearing types but not those. My main arms are comps..and MP bushed 273 advertised 7500 rpm iron rockers with shafts.