Roush Engine longevity/power with 10# pulley?

[Acheron315]

I am thinking about making the switch to the bigger pulley, a fuel pump, and a custom tune. How much horsepower does this usually put out to the wheels? Also, how many of you guys have made the switch, and how much extra wear will it put on my engine if the tune is conservative?

Let me hear your horror/success stories. I am debating between the pulley or cams.

 

[#191 02' Saleen]

If you still have a warranty, then it will be negated by the pulley. And yes, there is a way for them to tell if take the stock pulley off.

 

[Acheron315]

Nah....warranty has gone pretty much out the window
Thanks for your concern though

 

[2001s281]

the most you can get with the series II on a stock engine (i have seen) is 330-350 rwhp, 350 is with a very lean tune. i had a series II, made 330 rwhp, with the chicane pulley, and cracked the seal of one of my pistons. my recomendations is get the kb, or a paxton nove to make big power. if thats what you are looking for.