I will have to change the Cam as the one in the Magnum is pitted on several lobes. I guess I'll go back with a stock cam unless someone gives me better ideas. FYI, I don't know what "FI" means.
As noted FI means 'fuel injection'.... Acronyms R US LOL
You can go up a step or so in cams. If you go to the cam mfr catalogs, you can find some that are suitable and won't upset the stock FI system excessively. For example, Lunati says their smallest VooDoo cams are suitable for factory FI; PN 10120700 is a tad larger than what Garrett's friend ended up with.
So you might want to look at cam catalogs and maybe call around to some mfr's and custom cam grinders with your engine configuration and see what you can get for a slightly bigger. For the stock FI, the duration cannot be too big and the LSA ought to be 112 degrees minimum. The objective is to keep the exhaust-intake valve overlap time low, so as to keep the idle and low RPM manifold vacuum up. Manifold vacuum is what the FI computer uses to determine engine load, and if you get a big cam in there with a low vacuum level at idle, then the computer gets confused.... "I see 10" of manifold vacuum. Am I at the off-idle transition or am I at 70% throttle?"
