how bad does my stock c9ve intake hurt my hp

[Mizery]

with my engine build how bad is the stock c9ve intake hurting me. or if some one knows how much it could be robbing over an after market intake.

here is my build

c9ve ported heads 2.19/1.75 valves
custom comp cam .588/.588 lift cam solid flat tappet
650 lift max valve springs
10 to 1 comp
h beam rods
probe pistons
stock intake c9
high volum oil pump




grind number 6259/6259

intake center line 109
duration @.50 intake 240 exhaust 240
lobe lift .3400 .3400
lobe seperation 113

[Mark Miller]

Here's some results from the Feb 1993 Super Ford magazine Dove-C heads and a 460 CI Engine cam was a .513 and .518 duration was 216 and 228 at .050.

Stock Intake=409.4 HSP at 5,000 rpm and 520 lb.tq. at 3,250 rpm
Offenhauser Portosonic=424.4 HSP at 5,000 rpm didn't give tq.
Ford Power Parts 4250=423.6 HSP at 5,000 rpm and 497.7 lb.tq. at 3,500 rpm
Weiand 8012=429.4 HSP at 5,000 rpm and 505.7 lb.tq. at 3,500 rpm
Ford Power Parts 4250B=433.4 HSP at 5,000 rpm and 508.7 lb.tq. at 3,500 rpm
Edelbrock Performer=434.6 HSP at 5,000 rpm and 518.9 lb.tq. at 3,500 rpm

Hope this helps would be interesting to see how the newer Performer RPM or Torker intake would have worked on that combo.

Later Mark.

[Mark Miller]

I would imagine the stock intake is hurting your combo quite a bit with that cam and ported heads.What size carb are you using?

Later Mark.

[nuclearcobra]

I would jump on those victor intakes from Lem if you could i have a combo close to yours and took off the stealth 8012 and put on a victor and it was as responsive as the stealth and more up top and thats with the victor way off on the port match too the stealth was port matched perfect so i cant wait to see how the victor performs when its port matched.

[Mizery]

Originally Posted by Mark Miller

I would imagine the stock intake is hurting your combo quite a bit with that cam and ported heads.What size carb are you using?

Later Mark.

i have a 750 holly carb.

[Mizery]

Originally Posted by nuclearcobra

I would jump on those victor intakes from Lem if you could i have a combo close to yours and took off the stealth 8012 and put on a victor and it was as responsive as the stealth and more up top and thats with the victor way off on the port match too the stealth was port matched perfect so i cant wait to see how the victor performs when its port matched.

yeah i saw that the ports did not match. so it is possible to port match the victor to the c9 heads? my heads are a mild port. mainly removed the giant hump in the heads and cleaned up all the casting marks and milled out a little more. i will have headers soon on it. also would the victor handle a 225 shot of nitrous? also i found the stealth intake for 195 shipped new. good deal?

[Mark Miller]

More than likely it could probably use a bigger carburetor to IMO.

Later Mark.

[Mizery]

yeah it prob could use a larger one..

[4door]

Originally Posted by Mizery

yeah it prob could use a larger one..

carb is fine for street only use

[Mizery]

anyone want to takea guess on to how much hp it could be making with stock intake and the properly tuned 750 holly carb?

[DJOHAGIN]

Is this a street engine? If so, how much time are you spending above 4000 rpm?

Dave

[Mizery]

Originally Posted by DJOHAGIN

Is this a street engine? If so, how much time are you spending above 4000 rpm?

Dave

it is a weekend street/track car. and right now itsonly seen over 4000 rpm 3-4 times. but it hasnt been to the track yet. but im sure it will see above that quite a bit on the weekends.

[rmcomprandy]

I would speculate there would be about a 50 horsepower increase going to a "Torquer II" intake manifold.