Will a early 60's dual quad intake fit my '66 389? I keep seeing listings for 60-64,wondering if there's a difference

Asked by Jun 16, 2015 at 09:48 PM about the 1966 Pontiac Bonneville

Question type: Car Customization

1 Answer

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Older Pontiac V8's are 389-421". And famous for Rodchester 3-2's "tri- power" on the GTO. I guess the 2-4's (AFB's ?) would work if you don't go overboard on CFM's.(cubic foot of air per minute) like with Holley bigger CFM carbs. Or a higher lift & duration cam would be needed. I don't know what the 389" GTO tri-power cam specs are, & research that. 2-4's are roughly 700-900 CFM's. Old tri-power's is the lower end of that scale, (600 CFM's ?) & use progressive linkage so you can ease into the throttle & don't bog down the engine with too much gas. I used 2-4's on a 440 Plymouth Cuda' with a 284 degree duration hydraulic cam. Use that for a baseline. It was a wheel stander! Lower rpm engines is all about torque, not so much high rpm hp. I know 389's were much faster than the newer 400's.

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