The funny thing is is that the noise (rattling now is worse) is more at the tranny side of the engine. Ford just installed a new tranny/ clutch/ flywheel assimbly in my vehicle about 1 month ago, the re-machined the flywheel and stuff, and I have a SPEC stage 2 clutch. Anything related to that? The motor runs STRONG. I bet I could vastly improve on my 15.4 1/4 mile to a high 14. I'm quite worried, and if it is in fact is a rod bering that I could change out the engine in time for head damage (possible piston slap) My grandpa said throw-out-bering in the clutch could be mis-allined