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Well at least the one from a dealership will be the correct one and as I said it shouldn't be too exe ;)

the rest of that quote however is "and Donkey's seldom Differ" :)

Maybe but it might have been as simple as a cable from a junkyard with the different gear.

Hey I'm old and a bit ADD ...... ohhhh shiny things <wanders off>

There's only .1" difference in diameter between stock and your tires so that pretty well rules that out.

Care to explain how this will work with a mechanical Speedo?

Checked the big ass hose from the head to the block under the alternator?

The gear itself is available so if your speedo isn't stuttering it should only be a few $ to replace the gear. I don't have one here to check how many teeth are on it sorry, I'm sure someone should jump in though. 10Mph is a BIG error and this is why I think it's the wrong gear, remember...

Only thing I can think of is the incorrect driven gear on the end of the cable.

I use Permatex #4 aviation sealer on paper gaskets, I don't build leaky engines.

Jack it up turn the Driveshaft and count the rotations of the wheels then divide one by the other. Being an NA it "should" have a 4.30:1 gear set in it.

Used a ratio box for years until I ditched the mechanical speedo drive.

Has it had the Diff ratio swapped?

What's in the "fragile" box? an 7m head gasket? :D

Can you do a set of cliffnotes of what it's doing and what you've tried so far? I have a lot on my plate at the moment so am finding it hard to give your problem the attention it needs due to the rambling nature of the thread.

Would be better with coolant or even straight water and get it to operating temp before the test.

If it's Valves you can hear it in either the exhaust or the intake if it's rings you can hear it in the crankcase when you remove the dipstick or oil cap. The other thing you might find/see from the leakdown is if it pressurises the crankcase the leak may become evident. Needs to be done...

Ok my mistake I thought we were still chasing the Oil spray.

Your SM membership....

It would give us an idea of how much blowby gas your engine is producing as it may just be as simple as your current PCV system is being overwhelmed by the volume of gas.