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Old 12-08-2011, 07:42 PM
jarhed1964 jarhed1964 is offline
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Location: Charlotte, NC
Join Date: Apr 2010
Posts: 714
Mein Auto: '99 528i Sport, '05 530i
Originally Posted by bobdmac View Post
Also, 540Alex and I learned that lapping the valves doesn't give as good a seal as using a poly crystal diamond cutting resurfacer that a top-notch machine shop would use. As it was explained to us, this cutter leaves the chamber so airtight that if you used a felt-tip marker on the valve seat, it would make the seal less effective.

I'm going to ask my machine shop if they have that. I'd imagine I'd have to take the head back with the valves, right?
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