Estimated HP?

I just bought a 408 stroker motor and was wondering if any one might have an estimate on how much horse power it might be making?
What might be a good carb for this motor; I have an old 850 holley that came off of a 383 but isn't a double pumper.
What kind of limitations does cast piston and crank have?
Whats a good spark plug to run in this?

360 bored .030 over
4" Eagle cast crank
Cat H-beam rods
KB pistons 9.6 compression ratio
Edelebrock Performer Heads
Edelbrock Cam Flat tappet Hydraulic
Lift at valve
 Intake .488
 Exhaust .510
Duration at .050 lift
 Intake 234 degrees
 Exhaust 244 degrees
Edelbrock performer plus timing chain
Mopar single plain intake
Crane gold anodized aluminum roller rockers 1.5 ratio
Also has windage tray  

The same plug you would run in a high comp. 340 or pre 1970.
HP? around 450.
Why not more? Not enough cam.
I would go with a solid with at least .550 lift 284/242@ .050 duration.
I am not a fan of the vac. carbs especially in a performance application such as yours.
A 750 HP double pumper is more likely to out run and give better throttle response than your 850.
Doc  

with a 1.75" header around 450 flywheel. try the carb u have , what is the rear gear? a naturally aspirated mopar do not worry about a cast crank or pistons. with aluminum heads and only 9.6 a 10.5 1970 n9y plug may be a little cool. a hotter plug is a n10y or n11y champion. use a thin (.025") moparperf. p4120094 orange head gasket for more comp. ratio than the average .045" gasket.  

Hey thanks for the information I'm planning on putting the motor in my Demon the rear end ratio is 4.30 and I am planning on running a 28" tall tire hopefully. What would be a good RPM to shift the motor at, down the 1/4 mile.

Thanks  

whatever rpm makes the quickest time. start at around shifting at 5500 rpm, then 5700 rpm then 5900 rpm then 6100 , etc. rule of thumb is shift at a slightly higher than peak HP rpm. she sounds like mid to low 12's.  

The cam is a little small. I would go for a double pumper right off the start, but that is just me. The cast crank will take alot of power before it breaks. I agree a 750 would probably work quite well on this set up the way it is.

Personally I would shave the heads some, and get that compression up! If not, you are going to net your best hp numbers with regular 87 octane from what I have seen on our dyno.

If you went up with compression and cam, I would go to a 850 or 950 carb. I have seen many combos that had not enough carb, hardly ever see an engine that has too much!


My 434ci small block made the best power numbers and curve with a 1050 dominator, most would say that is too much carb, but I have the results that prove it! Dyno numbers and track numbers.  
434ci. "318" N/A Small Block. Street Driven Pump Gas Racin'

Go with at least 250* @.050 on the cam duration for that 408, but not too much, gotta keep some cylinder pressure!


Ask me how I know.  
age is no lock on brillance

use the cam u have. use the carb u have etc. make changes later.  

.250 duration with 9.6 comp? If you do this your motor will be lazy below 4500 rpm.
Doc