10-30-2017, 10:03 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
A 351C 4V intake port can be improved. We can pick them up 40 cfm with just some short side work and it will pick the power up on a 351.
The exhaust side stinks in comparison and work needs to be done there.
I specialize in Clevelands and have spent years trying different cams. A stock 4V head needs a cam with 8-10 degree split and a tight LSA. Too much split is a waste of overlap.
On this particular build, I had a custom cam grinder offer to grind me a camshaft for it and if it didn't make more horsepower than the cam I had chosen, I could send it back to him. I gave him every spec of the engine including flow numbers, rod lengths, you name it, INCLUDING the cam specs that I had chosen.
His cam made 587 hp. Mine made 615.
His cam had 17 degrees split between intake and exhaust. Mine has 8.
His selling point was that the exhaust side is so poor that it needs a ton of extra duration and that he was confident that his cam would make 30 hp more than mine.
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