Not Ranked
I know of a couple cars in my area that have a ROUSH 402 and 1 car has the Perf. Engineering 418. I also have a buddy in Ohio that owns a SPF with a Comp. Motorsports (now Perf. Engineering) 408. BOTH companies are top notch. I've talked with Eric @ Perf. Eng quite a few times and have been to his shop in Ross, and he builds great engines. The Roush guys do as well, but you'll pay a little more. They also do some kind of registry with their engines (from what I've heard) that match their engine to the car you put it in. They also have a 2yr / 24K mile warranty. Both companies dyno test their engines.
Performance wise, they are almost identical and use a lot of the same parts. Perf. Eng. 418 / 535HP vs. Roush 402 / 525HP. Eric's 418 has a little more Tq. (530lbs vs 500lbs) and he also offers different cam options (from mild to wild).
Bottom line is, you can't go wrong with either. .......I guess I wasn't much help.
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