I will be running a 2300 holley on a '78 250 head ( D7BE ) what summit transdapt adaptor do I need, the " Large " or " Small " 1bbl adaptor? I know it's 1/3/4" but there is no measurements, just says how thick it is.
If you are using a "universal" 2bbl adaptor like the one from "Stovebolt", you may need a small 2bbl (Weber) size to large 2bbl (Holley) adaptor as well. These are available for @ $20 from Summit or maybe AutoZoo.
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