The stock “575” ‘66 center car has 1 3/16” Venturi’s. End carbs have 1 5/16” Venturi’s. The larger Rochester 2GC carbs with 1 1/4” Venturi’s are common.
I have enlarged a few of these carbs to 1.420”, a little larger than the end carbs, which are 1.410”. There is adequate material to at least 1.4375, or 1 7/16”.
Similarly, the end carbs can be enlarged, as I’ve described on previous posts.
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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