First time lapping valves and was surprisingly straight forward.
The suction cup was fine on the larger intake valve, but would never successfully stick to the smaller exhaust valve. But just by keeping downward pressure on the valve while spinning, was able to get the lapping done.
Thought this was going to be the magic fix, but after getting the head back together, the psi hadn't budged at all and was still down at just 35.
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