Need help/advice with 5.7 swap
Cevidicus claimed 500-520 achievable with a Modman..... Just sayin....
And are 6.1 heads any worse at making power than Eagles? Not sure about that either.....
1970450767]So I have a factory crate 6.1 with dyno tuned dual quads on a modman and a SRTMAX Plus cam installed as per the card.
Gotta ask...Why ain't I making 520-550 HP?[/QUOTE]
I think you may not be making those kind of numbers because of your cam. It's designed for efi and is not really all that radical. But it's probably all you can get away with on a stock 6.1 due to piston to valve contact. As you have noted it is p to v clearance is close on your engine. Plus I don't think the mod man lends it self all that well to making maximum power and torque. My preference for the OP's engine is the drag pack style intake because I believe it's a better option for a single 4 bbl carb.
If you had some custom drop in pistons with proper valve reliefs and a more aggressive custom grind cam, I believe you could be making that 520-550 number with the stock 6.1 heads and 2-4 set up on your mod man.
Plus to reach the 550 number requires ported heads on either engine.
The MM VVT cams are like .600 lift and have pretty nasty duration too. Quite a bit nastier than an SRTMax cam.
Exactly. You can run a lot more cam on an eagle engine due to more piston to valve clearance and the rocker geometry is better due to longer valves.
My logic for those numbers is this: I have seen a stock bottom end 08 Hemi with ported 08 heads, an unported 6.1 intake with stock throttle body , tti headers, crane .590 lift 236/243 duration cam make 520 hp @ 6500 rpm and 445 tq @ 5700 rpm. So, it stands to reason in my mind and in my experiences that if you add a little bit more cam, 0.90 more compression, and 30 more cfm of head flow on ported eagles and the shorter runners of the drag pack intake that one could reasonably end up with 550 hp at 68-6900 rpm on a well thought out and build stock bottom end 09+ Eagle engine. Maybe my hypothetical numbers are a little liberal. Idk. I think I'm in the ballpark if not really close.