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Join Date: Mar 2003
Re: ea falcon head gasket
OK I'll try again, and copy it this time :s
I am in Perth, WA, and do not have that equipment anyway. (YET hehe, I will eventually )
First, the cam.
The cam controls the length of time the valve is open, therefore the amout of fuel/air which can enter the motor. In a performance motor, the object is to have the valve fully open for as long as the piston is generating suction, in order to fit more air into the motor.
In a street car, or daily driver, the object is to maximise fuel going in and therefore power, while retaining fuel economy. Therefore there are a variety of different cams available based on owner requirements.
Second, the head.
Porting the head involves enlarging the air pathways within the head.
Polishing is where those pathways are gven a ligh polish to smooth them down, thus reducing turbulence.
The whole idea of a port+polish is to allow gases to flow smoothly and rapidly through the motor. Think of the motor as an air pump - the more air you can move, the quicker, then the better the pump is.
The piston has to suck fuel in and push exhaust out. Allowing the airflows through the head at higher volumes and speeds will facilitate this process. In addition, you will be able to fit slightly more fuel into the cylinder based on the greater volume of gas incoming.
Now, combining the two.
The extra fuel allowed in by the cam and the increased airflow from the headwork combine to become more than the sum of their parts. The motor can breathe better, and gets more fuel, therefore can generate more power and does not have to waste as much power forcing gases in and out.
Of course, porting the head will only allow as much air through as the intake and exhaust manifolds will allow.
Here's the bad news - the CFI manifold cannot supply sufficient air and fuel to achieve much of a power boost, even with your new head and cam. I am afraid you will need to convert to MPFI before these mods have much effect.....sorry about that I assumed you already had MPFI!
On the other hand.....
How much money do you want to spend on it? You could do the port/polish while it's off, save yourself the cost of a new gasket/bolts later, and put MPFI and a cam on the car at a later date...
Sorry for the length of that post! :)
BTW, I reckon these mods are well worth doing - these Falcon motors have a lot of potential. They are relatively cheap to modify and do not need much more than what I have described, plus extractors, in order to go VERY hard indeed while still being good on the fuel.
Proud TQE Operator and President of SEFAG - the Society for the Elimination of Ford Automatic Gearboxes
Pacemaker headers + 2.5" exhaust
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