Quote:
Originally posted by A380Driver
Whats the diff between the S cams and C cams...and the diff between S3 and S4 cams?...
Does it matter between a high port or low port? 
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The S series cams can be used with the stock valve springs. The C series cams have much more aggressive lobe ramping and require replacement of the valve springs and retainers with parts from JWT.
They have had special valve springs made that raise the harmonics of the springs to keep them from floating - even with the aggressive C series cams. They are not much higher rate than stock (the common way of fighting valve float is to install high rate valve springs - sometimes not the best idea), but the key is the raised harmonics. Mike Kojima and Rob Cadle have gone into this in great detail on the SE-R Mailing List. The retainers are made of titanium since lower mass also helps to raise the harmonics of the valve train.
The valve springs and retainers are so effect that they alone will add about 2 hp on and otherwise stock engine.
The C series cams will make more hp than the S series.