[quote=lewtot184]what does it take or cost to get 320cfm from a standard port head? is a trick flow a true 320OOTB? what are you trying to do? [/quote

Came across them and thought they would fit the bill for my project - a 493 SixPack.

They are a few passes away from being new and come with roller rockers and a M-1.

Going to put them on the bench as a reality check. Just wondering what to expect.