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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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If both relief pistons were deep in their bores, they're not your issue. At this point it sounds like your oil flow is fine and stuff like airflow, timing, head studs, valve guides, and AFRs should be looked at.
Shoot me a PM if you'd like some help with this in August (am busy till then).
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Several BMWs
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