Hello, checked for play in valves guides and plug threads are good.

Measured both bores as best I could with my internal callipers and transferred that to my verniers to measure somewhere in-between 64mm and 64.1mm. Service limit is 64.165mm.

Both bores look good and I doesn't seem to be much wear.
Here are some images of where they are at (older engine is on the left).
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Found gravel in the sump of the older engine, 15 odd pieces up to 5mm long, cant be good. I found a few scars in the teeth of the cam shaft and oil flicker. Other than that haven't seen any other damage as yet.

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Older

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Newer.

Had trouble getting the base plates off and the cam shafts dropped out before I could scribe a timing mark on the crankshaft gear. So will have to find another way of timing them when I reassemble.
Cheers


Happy is he who penetrates the mystery of things.