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I'd be nervous boring that out. You will be reducing the thickness of the rocker arm by 1mm right around the bushing, which may or may not be sufficient for infinite fatigue life. Just eyecrometering, it would appear the later bushed arms kept the same thickness of material as your arm has, which suggests Porsche had similar worries.
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'88 Coupe Lagoon Green
"D'ouh!" "Marge - it takes two to lie. One to lie, and one to listen"
"We must not allow a Mineshaft Gap!"
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