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Originally Posted by vintagewebers
Here is a photo of the 58mm crossram I own with a set of sidedrafts. It's not as pretty as it could be but i'm still doing restoration work on the carbs. I don't know about you, but to me that is the ultimate sex appeal for the SBF.
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just curious, it's hard to see, but do the intake runners decrease in cross sectional area as they start from the carb base and pass to the opposite side of the intake, with most runners being sandwiched between two other runners? Or do the runners have equal cross sectional area the entire length?
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Originally Posted by What'saCobra?
Further, clearly a 58MM unit is way too much for a 289, .
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I thought that somebody said that the weber 58mm downdrafts were developed for ford 289 "indy" engines, and I believe that several magazines in the early 1960's spotlighted these carbs/indy engines. obviously, I would think Indy engines run at WOT at max rpms, most of the time, at least at the Indy 500.
Weber has a chart that recommends a certain size carb based on engine size as well as max rpms. The higher rpm you run an engine, the bigger size weber carb you need.