I have a couple of OE marine or industrial designs as well. One to a 2bbl 2GC pattern and a 2nd to a 4150 4bbl pattern. The 2 bbl has an open center, the 4bbl is divided with ridges machined into it and long oval ports. Both were setup for 2" bore marine and industrial TBIs. Even the 4.3L had a 2" bore TBI in marine and industrial applications.
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