Motors really can't be "visually" inspected.... What may appear to be little evidence of wear can be measured in .001".... Bores can be tapered or out of round... guides can be too loose or too tight... Ditto that on bearings and clearances.
The fact that there is no visual "damage" is a good thing....
The weak links will be the cast pistons - the powered metal rods... and the overall "factory" clearances. That motor probably came with a forged crank... a good thing. I always love the guys that tell me their motor is "blue printed" - as if though that is some speed secret... when, in fact, it means nothing more than someone has bothered to measure every spec and make sure that it is actually within spec.
Now you have to ask yourself if you want to push the RPM level.... which - if any - parts need to be improved upon. Maybe none, if you don't want to spin it more than 6,000 RPM's.
I personally short shift the motor in the Mustang - and it has nothing but the best of the best internals... but I figure nobody is paying me to "win" so what difference does it make if I shift at 6,500 vs 7,000....
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