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Originally Posted by Byots
Here is a picture of a high riser equipped engine in CSX3002 at Silverstone in late '64: http://www.clubcobra.com/photopost/s...0&ppuser=18204 The carb was an 850, as evident from the different shape of the airhorn relative to the 780. Period Ford documents list the 850 for the "7000 rpm" high riser.
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Well, obviously the air horn has been modified, as well as the choke plate removed. I believe a 850 holley carb has bigger throttle bores and plates compared to a 780, and I am wondering if the carb pictured is a "true" 850, with larger throttle bores/plates, or simply a modified 780 for greater airflow, being labeled as a 850, which would then not be a true 850, and probably not flow like a true 850.
I'll do alittle investigating.