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ford 312 stumbles at 1/4 throttle

Posted By tommyd 12 Years Ago
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ford 312 stumbles at 1/4 throttle

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tommyd
Posted 12 Years Ago
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i have a 312 3x2 setup it stumbles at about 1/4 throttle if held there. ported vacuum also
Ted
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Welcome to the site.

 

Which distributor are you running?  The pre '57 Load-O-Matic distributors are problematic when trying to use them with three deuces.  What carbs?  The Holley 94's incorporate both venturi and ported vacuum at the distributor port and need to be modified to use a later model distributor if using the vacuum advance chamber.  What is the jetting in all three carbs?  Do the end carbs have power valves?  If not then larger jetting is required where the power valves have been removed.

Lorena, Texas (South of Waco)




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