I was told that the green paint marking on the intake valve as seen in my picture, means they are the hollow, filled intake valves. I have no way of actually knowing. I can tell you they are great heads at a great price. If I cant sell them, they will end up on my LQ4 suburban along with the bnib LS6 cam that I have for it.
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2011 CORVETTE 4LT, loaded with EVERY option, chrome wheels, carbon fiber interior, HUD, etc. Intake, exhaust, and tune. More to come.