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Hi Wbrockstar,Anytime you change something from stock,it can change its sound.Removing something as simple as the factory air intake silencer,behind the airbox,can change the sound. If you had the cylinders bored .030 over for the rebuild,that can change the sound. Anything done that brings in more air or puts out more exhaust can alter its sound. I would,however,check the converters and mufflers to make sure no clogs are present and the internals of the mufflers arent collapsed.
You can run a cylinder balance test too,to make sure each cylinder is putting out equal amounts of power.
(Cylinder balance test link)
http://sbftech.com/index.php/topic,2471.0.html