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[TobyB]

I'd lap the intakes lightly just to confirm the seating pattern- they look fine.

Either the exhausts are completely carboned up, or have great horkin' divots in them-
Digger's right,...

[TobyB]

+1 for an oversized eccentric-
I have had at least 2 budget rebuild heads with cleaned up
worn- but- serviceable parts and reground cams that have needed one or 2 oversized eccentrics....

[TobyB]

I was going to say that you are braver than I am,
but then realized you measured in inches, not mm.
1.0 mm seems about the minimum I can stomach, too.

I WOULD suggest using a...

[TobyB]

BMW... go figure. I never would have guessed....

t...

[TobyB]

Do tell more. I've only dealt with the M10 1980 direction change- didn't have a clue that the M20 also changed...

t...

[TobyB]

That's totally fine if it pressure tests ok.

I've used M10 heads with far more corrosion than that, and they sealed ok.
Even with Reinz gaskets...

t...

[TobyB]

Ideally, both the high and low reference sources would come from the logger, so that if one 'moves' the logger
moves with it.
If you can measure the resistance across the vref and ground...

[TobyB]

The E39 follows the standard M52/m52tu/m54 progression.
So the early cars will have a single vanos M52,
mid- range cars get the M52tu with the odd throttle
body and 3/2 return valve...

[TobyB]

As long as it's not an eta and you change things such as sensors, oil pan and the thermostat housing, it ought to work just fine...
www.realoem.com has part numbers broken out, if you want to go...

[TobyB]

Y'know, I think I got the male connector from them, back in the day.

One of the rabbit holes I fell down was figuring out which connections I might
want to interrupt for testing and...

[TobyB]

Yeah, looks like the holes don't go far enough in to pull the cover down.

That looks like the 'clutch masters' flywheel, with some extra milling...

The rule of thumb is that...

[TobyB]

I too endorse this plan. I found that a hard diff bushing was telling me more than I wanted to hear about what was going on in the rear gears...

The E36 diff cover conversion always made...

[TobyB]

The numbers here matter- quite a bit. Nose and seat pressures vary tremendously on 'stiffer' springs,
and I learned (also the hard way) that you really have to do your own measurements and maths....

[TobyB]

Your 5v reference should come from your logger, as should the 5v ground for the TPS.

If the switches are in common with the DME, then logger ground should be bonded to DME
logic ground....

[TobyB]

Welcome!

I'll be the first to say that it's exceedingly unlikely to be the throttle body itself.

Air leaks are the 2nd thing to look for, after you check your plugs and wires....