Dimpled out TB on the 4.3L vortec cable driven.
Started by opening the TB inlet bore, carved more less at a 1/8 inch of material ⤵
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Smooth it out ⤵
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Started to dimple in effect on the iner bore ⤵
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Including the TB plate ⤵
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Some dimples manage to go thru in some area in TB iner wall due to thinner material. Epoxy covered in. ⤵
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Here's a screenshot out of my phone (tool scanner app.) Before mods ⤵
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Then the after mods reading ⤵
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Juan