If the head is off, remove the valve keeper and springs so you can move the valve stem in and out of the guide and observe for interference. You can also spin the valve stem and look at the runout. You may be lucky to see the gap between the valve seats and the valves visually without removing the springs. __________________
1996 Ti 280k miles and still going....
1993 964 - holding on to this one
2001 Burban, 240k miles
2018 Suburban Z71
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Bent Valve? 
Linear Mode
