cobra heads

[bcd]

Does anyone have the flow numbers on gt40 iron heads? How much cam can they hold? A friend of mine is making 311 rwhp with gt40p's and a cobra intake. I was wondering if I could get in that range with 40s and gt40 upper and lower.

 

[CManT1914]

They don't flow quite as well, but they're pretty close.

 

[bcd]

I Appreciate it man

 

[bcd]

does anyone know the cam info

 

[Maryland Stang]

Just so you know there is an error in that table. The Powerheads intake percentage over stock should be 138.2 and not 113.2.
The exhaust percentage should be 159 and not 130.

No wonder Powerheads get a bad rap sometimes.

 

[CManT1914]

does anyone know the cam info

I'm gonna assume you mean the Cobra cam, well I don't know what cam the Cobra has in it, but I think it's similar to one of the "alphabet" cams. Here's their specs:

B303, Valve Lift Intake w/1.6 rockers-.480, Valve Lift Exhaust w/1.6 rockers-.480, Duration Intake (at .050)-224, Duration Exhaust (at .050)-224, Lobe Center-112, Emission Legal-No

E303, Valve Lift Intake w/1.6 rockers-.498, Valve Lift Exhaust w/1.6 rockers-.498, Duration Intake (at .050)-220, Duration Exhaust (at .050) w/1.6 rockers-220, Lobe Center-110, Emissions Legal-Yes

X303, Valve Lift Intake w/1.6 rockers-.542, Valve Lift Exhaust
w/1.6 rockers-.542, Duration Intake (at .050)-224, Duration Exhaust (at .050)-224, Lobe Center-112, Emissions Legal-No

But the Cobras also used 1.7 rockers.