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Message: <blockquote data-quote="beyondEOD" data-source="post: 1459181" data-attributes="member: 23983">Ok I think there could be a few issues.  I can't tell what heads those are the pictures are not showing on my phone but we know they are aftermarket if their aluminum. My concerns or possibilites:1. Valve springs are not heavy enough for the camshaft. 2. Piston to valve clearance is way to tight.3. Stock rev limiter was raised in the tune.Things you can do depending on how you want to tackle it.1. Remove the timing cover, timing set and see if the cam is labeled.  ID the cam.  Remove a spring and have a machine shop measure the spring rate.  If the springs are not adequate replace them.  Check limiter in tune.2. Swap the cam and springs entirely. Check limiter in tune.3. Check limiter in tune. If it's set way higher than factory. Reconfigure and replace the pushrods.Hopefully a valve is not damaged all together. Sent from my SM-G960U using Tapatalk</blockquote>