Mystery M20 Bolt/Coolant?
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It looks like it is the fitting for the throttle body coolant return line that threads into the block, at the #6 cylinder, under the intake manifold.
Number 28 in the diagram.
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that screws into the block near cyl 6 on the cold side of the engine
number 28
http://www.realoem.com/bmw/showparts...17&hg=11&fg=10
edit: beaten to it...89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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