66cutlass400

I recently purchased an original tri carb intake, and am starting to piece together the carbs/linkages/fuel lines. None of the spec sheets on the carbs list the venturi size for them, does anyone know what the correct size was in '66?
Thank you, Eric Gould

RAMBOW

Call Mike w/ http://www.pontiactripower.com

He was very helpful when i restored & rebuilt the carbs for my buddies L69. He Has done quite a few 66 olds Tri-Carbs as well as the pontiac stuff & knows the guts of the carbs & can help you pick the right parts for your application.

Run to Rund

center carb (primary) 1-3/16"
end carbs (secondaries) 1-5/16"
On the four barrel scale (1.5" vacuum) they are 249 and 299 cfm or round off to 850 total.