Mild 360 Magnum Build

gzig5 said

Do you know if they have any results with the standard 171 version of the ProMaxx? It's not far behind the Shocker for peak flow, about 30 cfm. I've got a set and I'm trying to decide if I send them out for the Shocker treatment or just use as-is.

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Gzig, 30 cfm from a set of these types of heads isn’t what I’d call “Not far behind.” Also a lot will be combination dependent as well as the engines CID. In the laymen’s EZ math, it could be a 60hp difference. Nevermind when your going to push it a little hard.