This video I got to ask what with the Chevy Vortec Cylinder Head that are listed as having a Maximum Valve Lift (in): 0.475 that if your lucky to that much, but yet they install a Edelbrock Rollin' Thunder Hydraulic Roller Cam Valve Lift with Factory Rocker Arm Ratio and it life is 0.539 int./0.548 exh.
Are you all sure that this is the right cam that used as every where I have read that even stock Chevy head are only good for Maximum Valve Lift (in): 0.450 unless you have them modify and even the modify version of the Vortec Cylinder Head are only good for up to 0.525 lift like the Big valve Scoggin Dickey SDPC SD8060A2 or Small valve Summit Racing SUM-151124.
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