I have finally found the money and time to finish up my car, It now basically has ported ls6 heads, hot cam, ls6 intake, etc. It has been 3 years since I drove the car and now I have put about 500 miles on it. It runs awesome, but it sounds like there is a lot of valvetrain noise. Is that normal, is lifters, or springs? Does anyone else hear more than just their exhaust or may I have a problem?