Car Craft Mag 2003 400hp from a stock

[Steve69]

HO 5.0 shortblock with AFR heads. My question is what type of intake
manifold and what size carburetor would have to run for 400hp?

Thanks

 

[jbuening]

I'm leaning more towards a Vic Jr. and a 670-750cfm carb for that kind of power. Is this 400 at the flywheel or at the wheels?

 

[12sec67]

i thought they used Kaase SB-Ford heads?

 

[DukeGnarley]

they used a 625 cfm demon carb and a Stealth intake

http://www.carcraft.com/techarticles/116_0307_ford/

 

[SoCalCruising]

If you plan on a hydraulic roller cam, you will be better off with the Stealth than the Victor Jr, which needs higher revs to make power. A 575 cfm Speed Demon is enough carb. The magazines use more carb so that they can make max top end power, but too much carb makes a motor lazy at low RPMs and that's less fun. You want a snappy motor and you should not care if you give up 2-3 hp at the top to get it.

 

[Steve69]

Thanks for the info

 

[SoCalCruising]

To answer an earlier question: that was flywheel power. Most "magazine" power is done with an electric water pump, no alternator or other accessories, so it's not what we see on a fully accessorized motor. A realistic power number for a streetable motor using aftermarket heads/cam/intake would be 300-325 at the wheels. If you do better than 325RWHP on a well-mannered 302-306, you have accomplished something, IMHO.

 

[Steve69]

Good point

 

[iskwezm]

my buddies dads 289 was rated at 414HP on the engine dyno with 10.5"1,AFR 165's and single plane 650 carb