Hi everyone, I am in the process of building a forged 355, lt4 hot cam, Superram Speed density setup. I'm running a t56 6spd with a 3.42 10 bolt. I have the whole setup, less heads. I have been looking at the Pro Topline heads, they are in my price range and flow great out of the box. Since the motor is a 355, I was leaning towards the 180cc heads. Should I get the 180cc iron heads or the 200cc iron heads? I was also going to buy the bare heads. I have a set of lt4 springs, retainers and locks. Would those springs fit on the heads without any machine work? The only other parts I'd need would be the valves. Any advice on 2.02/1.60 valves that will work with the lt4 springs? I assume I'd need lighter valves. Thanks for any help.

 

Eh, this post is a few days old but certainly not stale yet. I'm also looking into the 180cc heads, I glanced at the 200cc heads, but the flow #'s put me off cause I'm using TPI. I'm pretty sure I don't need a 200cc intake runner for my planned setup.

Parts I have...
LPE 74211 cam, 211/219 duration @ .050 with .530/.560 lift.

Parts I'm thinking about....
Iron Lightning heads, 180cc. 64cc.
SLP 1 3/4's headers, y-pipe
Aftermarket base (no brainer here)