The s14 cam gears are the same as the s38 cam gears (since it is 2/3 of an s38) which were fitted to the 84 M635csi and started production in 1983.
The m42 cam gears are completely different and were designed like 5/6 years later for the m42 which came out in 89 in europe. You can see the difference with the s38/s14 cam gears looking like a dinosaur based on the m88 cam gear vs the m42 one
The m42 cam gears are completely different and were designed like 5/6 years later for the m42 which came out in 89 in europe. You can see the difference with the s38/s14 cam gears looking like a dinosaur based on the m88 cam gear vs the m42 one
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