ProComp/Speedmaster aluminum heads

j par said

I was wondering if you would give your impression of their bare heads as opposed to what like I have a set of 596 heads?

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I'm trying to reply to myself here LOL but also asking another question as the only picture I have in my mind is these look like Magnum heads with the capability to put shaft rockers on top of them? Although I don't have any bare Magnum heads to compare that either LOL...