Perhaps:
0. Valve is hitting the Piston?
1. ValveRetainer is hitting the Valve Guide?
2. Outer Spring Coil Bind?
3. Inner Spring coil bind?
4. Exhaust Guides too tight?
5. Loose-Lash causing pushrod to hit off-spot in the Rocker cup?
5. Tight lash + lifter pump-up causing bind (see 1&2&3)?
5. genuine replacement rockers made from recycled BBQ grills?
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