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140 carb jets....What size should I use?
Posted by: Darren ()
Date: May 21, 2023 10:47AM

Still tinkering with the carbs after the move to a lower elevation. I came from 6300 ft to now 1200 ft. Looking for jet size suggestions. I can hardly make out the size on the existing jets (maybe a 50).



66' Monza Convertible
140HP 4 Speed
12' Ford F150
19' Honda Turbo Talon
06' Honda CRF450x
08' Saturn Sky
12' Acura MDX

Salmon Arm BC Canada in the Summer
Lake Havasu City AZ in the Winter

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Re: 140 carb jets....What size should I use?
Posted by: RobertC ()
Date: May 21, 2023 02:04PM

Stock on a 65 was 51 primary / 50 secondary.

Per Bob Helt's book, GM went "leaner" on 66 and up - for some reason (emissions in CA?)

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