How do I find out what has been done internally?
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It is a different car than listed in my profile. It looks like at one time it had a bottle on it, but does not now. Car pulls hard, but doesn't 'sound' like it is cammed. It is quite a bit faster than my 6-speed on motor.
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couldn't you just pop the oil filler elbow off and look in the valve cover and take a look for aftermarket springs? Or like said above the dyno won't lie. Or if u have a lsx shop nearby see if u could just give them a couple bucks to take a look at your tune(not change anything just look to see if it's not stock).