Mark IV is essentially the same set-up as Gen 6 when a step-nose cam is involved.
I could not be bothered to put a needle-roller bearing on the cam gear. The thrust plate is hardened steel, the chances of it wearing out are less than the chances of a bunch of needle rollers coming apart and falling into the oil pan.
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The water pump drive tang is a marine item, for a cam-driven neoprene-vane water pump.
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