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Originally Posted by webninja
I bought my car with cams previously installed, the owner said they were JWT 2nd generation cams - I presume he ment the s2 cams. Anyway to tell for sure? The cams are currently not in the car. Also do I need to have the jwt s2 program to run them correctly?
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Get a set of calipers and measure the highest point on one of the lobes. Multiply that by 1.55 and you'll have the valve lift. If its close to the S3 measurements, its probably an S3 cam. If not, its an older grind. FWIW it seems the "S3" grind has changed once. There is no easy way to measure duration.