okay guys I built a gsr. With supertech valvetrain aftermarket cams and cam gears. when i set timing at 0 its all good. when I try to turn the crank (motor is still on a stand) the intake cam moves and the exhast moves some but after a bit the exhaust cam stops and when I apply moe force to the crank the intake spins and the belt jumps teeth on the exhaust cam because it didn't move. I'm so confused. It's a gsr head. What can it be?





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