i have some Iron eagle cast heads on a 10:1 compression 406ci with a flat tappet 520 lift cam (street cam)...victor jr (stock) and a holley 750cfm off the shelf ( still has Horn) and it made 460hp and about the same amount of Tq...we did nothing to heads but drill steam holes.
i am wanting to say they are 215's...but for some reason i was thinking they were 2.02's or possibly 2.05's...its been so long ago we put this together i can't remember...
My engine Guy said with some port work on these heads along with some intake work and a more agreesive camshaft and bumping compression up a point we could get toward 600hp mark..
i ain't gonna screw with it with the stock 400 block....its old and Tired
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "