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Originally Posted by FastNX
From Mike K's dyno testing, JWT springs are worth 2hp on S4 cams. AFAIK nobody has tested them on stock cams, they should be worth something, althogh probably not the best HP/dollar
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The purpose of the valve springs is to prevent valve float, which is explained in detail here:
http://www.automotiveforums.com/t152566.html
The purpose of cam makers recommending using their valve springs along with their aftermarket cams is to minimize the risk of valve float, which increases with higher lift cams. The only thing that the JWT springs will do is simply close the stock valves a few milliseconds sooner.
Being that as the case, it won't make any realworld or noticeable difference.
