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ok well i stole an aircraft borescope from work today and took it over, its one of those pencil thin cameras with a light on the end and you move it with a joystick and watch the handheld lcd, it rocks, like 6mm radius. anyways, stuck it down through the spark plug and i could see the piston definately was hit by something, no bad, but noticeably scared. the valves and everything look good from the inside and outside, we did find ball bearings in his turbo manifold, not so good, and nothing in the intake plenum. we are also using ngk 7 copper plugs. cant seem to find the culprit, we are going to drain the oil and check the plug for signs of a shot bearing. any other ideas are welcome, thanks for the input guys.
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