i have a friend with a 1978 eliminator with a 460 ford
it has good heads a comp cam edelbrock intake 800cfm holley bassett headers.the question is he is doing his jet it has a "b" impeller in itand he is turning 4800 rpm he is thinking about going to a "a" impeller what rpm should he expect also will he lose speed
he ran 72 mph on gps any help would be much appreciated.
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