Aluminum Chinese imports that have had some port work done. Pro Comp PC3003 (210cc, 64cc)
I had a long conversation with a machine shop (who is old friends with a buddy of mine and they have a great reputation) this afternoon about my engine and having them install an internal balanced rotating assembly. He thought it was interesting that the vibration is hardly noticeable when the engine is revved in neutral, at a standstill. He said anything is possible, but the out of balance engines he's dealt with in the past were noticeable both loaded and unloaded.
He suggested to revisit my driveshaft before pulling the engine. I've had the shaft balanced/checked twice by a reputable local shop and it's "within spec". But, he said has experienced "good" driveshafts on the bench, that present with strange harmonics/vibration on the car.
I'm going to see if I can borrow someone's (known good) Camaro driveshaft to try in my car.
Trying to exhaust all possibilities before pulling the engine...
Daniel
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