Wow, that noise has me stumped since its not directly related to RPM. Sure sounds like something is loose/rattling around though. Maybe a broken rocker is rattling around?? I'd start w/ the simple stuff. Drain oil and look for bits, pull valve covers and look for bits, etc. If those turn up zilch a compression test will narrow down to the offending cylinder.
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Stephen
www.salazar-racing.com
1970 914/6 - 3.0L GT
1983 911SC - 3.32L IROC
1984 930 - 3.6L
dirt bikes (some gas, some electric), Sherco trials bike
Sold: 2001 Boxster (hers), 2003 996tt x50  , SpecE30, 1996 E36M3 GTS2 racecar, 2015 Mustang GT, 2008 S2R1000
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