05-03-2003, 02:03 AM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Don't overdo the carb, a very common mistake. 650 should be enough CFM for even 300 horse or more. I think the typical "up-grade" cam is a Ford E303, or something like that. You may want to start by looking at the numbers for a "hot" Ford cam like that and go from there.
Porting the heads? I would consider going with Alum after market heads, Edelbrock or whatever. "Breathing" is where you make horse power. Carb (not TO big), intake, camshaft (not terribly "wild"), GOOD heads and HEADERS will be required to make 300 horse.
Consider the CC's of the combustion chamber if your going to do new heads. The smaller it is, the higher the compression will be. Higher compression equals more horse power, but there is NO FREE LUNCH. Everything is a balancing act of selecting the right "parts" to compliment each other.
If you get a nice cam, but have a "smallish" intake, the cam will not work properly. Same for the heads. FLOWS have to match capacity in all the parts. The weakest link will determine where the limit of horse power is. So you got good flow now but still running that restrictive exhaust system? The headers or muffler will now be the "weakest link".
I'm going with Alum heads, small CC chambers, NON emmission drilled, a nice matching cam, after market intake, 75 mm throttle body, 24 lb injectors and some custom made headers. I thought about a carb, but decided I could make more horse power with injection in the long run.
Oh what the heck, leave the heads, intake and cam "stock". I'll add 30 lb injectors, 75 mm throttle body and a Super Charger running at about 7 lbs. That should get me close to 300 horse! All it takes is "money".
Ernie
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