Dr Jamie Meyer
August 1, 2005

Horse Sense:
This is not a modification for the faint of heart. Once you start taking a Four-Valve, four-cam modular small-block apart, you'll think that the parts will never go back together. Unless you want to get involved in a serious weekend project, we suggest that you leave this one to the pros.

So, you got yourself an '03-'04 SVT Cobra-the baddest Mustang ever produced-and you've done the simple things like a cold-air intake, performance exhaust, and pullied the supercharger to make more boost. Maybe you have even had Apten Performance (run by MD Motorsports) port your stock blower for a stealthy extra 30-40 rwhp. Top that off with a set of drag radials and a nice reflash of the computer, and you've got yourself a mid-11-second car that will drive anywhere in the country with complete reliability and comfort. What do you do now?

Well, you could add an aftermarket supercharger and get right into the 600-plus-horsepower range at the wheels, but as soon as you lift your hood everyone in the game is going to know exactly what you've got. Perhaps a better way to get that extra edge on the competition is to look underneath those massive cam covers to see if you can extract some power with aftermarket camshafts. For quite some time, we've been told that camshafts for these cars were coming that could make a big difference in the performance of the already overachieving blown Four-Valve. But, it wasn't until we started talking with Dennis Miles of Comp Cams that we realized just how serious this cam manufacturer was about getting more power from the most powerful Ford engine ever assembled.

"There's always a lot Comp Cams can do over the factory valvetrain," Dennis explains. "These cams are designed for a blower or nitrous car-not a turbo car though, because they can over-scavenge the combustion chamber. The goals of these cars is to get the exhaust out as quickly as possible. These Ford modular heads flow extremely big numbers-they are efficient cylinder heads-so we wanted to design camshafts that would get all of the exhaust out of the head. With this lobe separation, these cams can easily help on cars that make up to 30 pounds of boost."

Of course, the cams (PN 106360; $1,431.24) come in a set of four with the intake and exhaust profiles on separate cams. They spec out with intake numbers of 0.475-lift, advertised duration of 265 degrees, and actual duration of 230 at 0.050. On the exhaust side, they measure 0.450-inch lift, advertised duration of 267 degrees, and actual duration of 323 at 0.050. The Comp Cams cams are set up for a 116-degree lobe separation for low overlap and decreased chop for a smooth idle. For comparison, the stock cams are 0.394-inch lift for both the intake and exhaust with 184 degrees of duration at 0.050 on the intake and 194 degrees on the exhaust.