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Old 12-08-2011, 08:20 PM
bobdmac bobdmac is offline
Older than old school
Location: Oaksterdam, Yay Area
Join Date: Feb 2011
Posts: 4,414
Mein Auto: 2001 540i/6, '90 k75s
Originally Posted by jarhed1964 View Post
Thats good stuff! ... What was the reasoning behind the shims? To give more compression to the valve springs?
It does in fact increase the spring tension by effectively increasing the pre-load on the spring, but I don't remember the exact reason. I remember hearing the guy talking with Alex about it when he picked up the heads, but I don't remember the rationale.

As for the machine shop, Alex took the heads, with the cams and valves stripped out, and with every part carefully identified by its cylinder number, to the shop. He re-installed everything. You might look through the thread, which has a lot of info and photos.

In looking for a shop, I think your best bet would be to find a place that does a lot of race and performance car preparation.
BMW--giving new meaning to the phrase "disposable income."
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