Originally Posted by codyace

Solid advice for sure. I've never bothered with a new chain though...I mean if you're dealing with some abused car based upon other parts of the motor it may not be a bad issue, but it takes quite a bit to wear the chains out. That tensioner has a TON of 'slack' take up ability



There are many factors involving 'safe' limits of cams, not so much the hard numbers. Ramp rate, lobe design, etc etc all go into it. For example: With JWT cams (like the S3) it has a 0.442" lift (11.2ish mm)...and they are plenty safe on stock valvetrains to 7850 (where they set their limit at).

S4's have a 0.464" lift (11.7mm) and they too are safe to 7850 on stock stuff. Crazy huh?

But The C1 cams at .476" lift (12mm) require springs.

Just some food for though. The crappy thing about any cam in any motor is that is a HUGE discrepancy between measurements, lobe design, and general R and D. Sure a cam may make power, but being safe, and harmonically sound are very different. I mean, there is just TONS of engineering involved with cams it's rediculous.