CONTROL FREAKS IFS A-Body 440 setup

Everything is cool Dr. When I read #3 of your post my thought was "your comparing an aluminized BB to a stock SB" not that the BB would be in the weight zone of a stock SB. One of the limitations of interpreting internet prose.

I agree that the SB stroke/bore combos are stretching the "hairy" edge. My friend has pushed his NA 408 race motor to its limits and is experiencing the pain of trying to keep it together. Major money dumped into very expensive parts every year. His engine builder, Brian at IMM, told him he really needs to go BB if he wants more power.

To the OP's question: "Since we are on suspension, what's the better size torsion bar setup? PST has 1.03 and I've seen 1.08-1.2 I think. What the most I can do?"

Depends on what your doing with the BB and how serious you want the handling. If the BB is stock you can go with a larger TB to compensate for a little more weight on the nose. If you lighten it up with aluminum components then standard A body upgrades should work. PST has 1.03, Firm Feel lists 1.06, 1.12, and 1.18 for the A body IRC. The actual physical limit of the TB pockets is 1.24. Racers used to weld in bigger C body pockets into the LCAs and trans cross member. I don't know of anyone offering 1.08 or 1.20. Firm Feel is your best bet for custom TB. In all seriousness the setup 72bluNblu posted is great package and very effective in performance gained for $ spent. I'm planing to go with 1.12 in my SB Duster but I'm leaning a little more for track performance over road compliance. Be sure your shock valving matches the TB you choose. Price wise Bilstein RCDs are a good choice for 1.0 - 1.03, Hotchkis Fox for 1.06 - 1.12, above that your going to need to really step up in price and quality.