I measured a few end car venturis, both the 997 and 683 casting numbers. They are 1.310” or 1 5/16”. Attached pictures show detail.
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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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