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Ian,

Timing dots (drill points) filled with paint was a Lotus thing, and the Jensen-Healey didn't use it. They used a line/groove cut radially across the pulley rim for a timing mark, and engraved the MOP number on the pulley center-web, near the timing mark. No paint color. Asking them what COLOR MOP the pulley is will just get you a blank stare in return.

Jensen-Healey's all used C-cams. The MOPs were:
115 MOP Up through engine number 4030.
110 MOP from engine number 4030 onward.

In North America only, from engine number 10480 onward.
100 MOP on the Intake
110 MOP on the Exhaust.

By this time (1976), the J-H and Lotus 49-State versions of the 907 were the same, and the late Lotus Federal 907 also used this same 100 IN / 110 EX cam timing. It doesn't matter where you get the parts... you do not want this timing! It guts/ neuters the 907, and this config (along with the lean fuel mixture and lame ignition timing) is the source of the unkind "Gutless Wonder" saying. Not all 907s were gutless... only this last, Federal emissions 100/110 version.

Early 100 Blue dot pulleys were a true 100 MOP, but it didn't last long.

.The later 100 Blue dot/ 110 Red dot "DUAL MOP" pulleys 'cheated' the Blue dot to 97 MOP in order for it to fit on the same pulley with the 110 Red dot.

The 115 (no color),
110 Red, and
100 Blue/110 Red dual MOP pulleys
all contain 110 MOP on the pulley. If it's not marked (as on the 115) You just need to know where to find it... but it's there. IF you find one of them from a Jensen-Healey vendor, I can show you where the 110 MOP red dot is... or should be.

But when you speak with a J-H vendor, inquire about an MOP... not a dot color.

Layered on top of all of that is the question of MOP accuracy. Is the MOP pulley you find really the MOP that is marked on it. If you have the means to accurately measure the keyway location in the bore, some pulleys are clearly not the MOP that is marked on them. Oh fun...

Regards,
Tim Engel


07/25/2022, 7:19AM, webdudeca <webdudeca@...> wrote: