Nick - your cam specs are not that radical. It's a good cam for sure but not a 10 second car type radical. I built a 302 a while back with .488" lift and 288 duration. I think it was a crane cam, not sure now. Behind it was a close ratio top loader 4 speed and 3.25:1 geared 9 inch rear end. It pushed an otherwise stock 67 Cougar to low 14/high 13 second quarter miles - all carbureted. So not a monster but still pretty fast for street. Also - with the grind you have, it should be pulling about 6,500 R's. If your not getting that and suffering from power loss, you are probably way too lean.

Now the science of controling the A/F ratio is made real easy with Mass Air. I assume you are using an EEC-IV. A little less options than an EEC-V but either PCM can be chipped to handle this cam. I would think you need bigger injectors - 28 pounds/hr maybe? That's a guess but more than a stock 19 pound. You will need a dyno and wide band O2 read and a guy with a programmer who knows what he's doing.

Crane is wrong that a cam is too big for a computer. That's one of the most rediculous things I've ever heard. How do you think top fuel drag cars run their EFI - with computers! Speed density, like Ken mentioned, has some limitations but all that goes away with mass air.

 

Crane is wrong that a cam is too big for a computer. That's one of the most rediculous things I've ever heard. How do you think top fuel drag cars run their EFI - with computers!

They are referring to [I]stock computers. At that level, you even find (some) cars running SD, which when properly tuned has been proven to have quicker response than MA. Pretty cool stuff.

 

Sure that's what they would imply, right? When you change air flow through a motor, you have to adress the A/F mixture. It simple physics. So why would a high performance cam manufacturer not know how to make its products work? I think the original poster just got a hold of a numbnut on the phone that didn't know what he was talking about.

 

So Nickcletus, have you decided or tried anything yet?

 

i ended up bending some valves cause the cam was wrong it held the valves open too long and they were hitting the pistons. so i yanked it and put in a new rebuilt motor.

 

The cam had to be intalled wrong to do that if the specs you gave us were right.