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Below evaluation done by Korman. Cams fit all M30 motors with distributors!! Email with any questions. Thanks, Todd
Cam #1
Marked
M112C
M197 A-E
Dual Pattern
base circle 25.07mm
lobe height 32.40
(7.33)
Then you get to the fun part. You must multiply this by the rocker arm ratio, which changes when you regrind the cam or change the valve installed height. Some will say that this ratio is as high as 1.5, but the more commonly accepted ratio is 1.3. (Schrick uses 1.25 or 1.26). Using 1.3 yields 9.53mm of lift. Old 2800's and 3.0's had 9.1mm of lift stock, later 5 and 6 series had 8.8mm stock. I don't have a way to accurately measure the duration, but do have quite a few lobes to compare these to. They both appear to be in excess of 300 degrees. You can regrind and get as much as 330 degrees. These are somewhere in between. The result is a horsepower cam (vs. a torque cam) that will have a lopey idle and not much power until you get to higher rpm's. We would expect a cam with this much duration to have lift in the range of 10.5-11+mm, having less these may be a bit peaky.
Cam #2
Marked M197 A-E
25.42
33.0
7.58(1.3) = 9.85mm/lift
Same lobe profile, a bit more lift
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