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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,225
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I have 'em. I like 'em. They give a good combination of low RPM torque and high RPM power. I don't have a lot of experience with different cams in 911's though. I know that with my CIS 3.2LS engine, I can floor the pedal at 1300 RPM and it pulls cleanly to the top of the rev range. Now, as a matter of good mechanical practice, I don't usually floor the pedal below 2000 RPM, but it shows that the combination of M1's plus CIS is very drivable across the rev range, which is what I like for a street driven car that isn't a high-RPM track car. It also gets close to 30MPG at 70MPH cruise.
With 3.0 small port heads and 40mm carbs, I think they would work very well.
Let's wait for Ian to weigh in, because he helped William Knight develop the cam.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
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