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the diagram is nice, but you can start your number 1 anywhere. you don't have to have it at a certain place. that was just where the factory put it. it will start firing #1 and so forth whereever you wanna start it...
Holley made two model carbs that used the top plate like a Carter or an Edelbrock. It was a newer design that Holley came up with (years ago) to help alliviate the leaking problem (which Holley's are notorious for). The two models were the 4010 and the 4011. If I remember right, the 4010 ranged from 600 to 750cfm(somewhere in and around there) and the 4011 ranged from 650 to 800cfm. The quickest way to determine which one you have is to look at the butterfly valves. The 4010 had all four butterfly valves the same size. The 4011 had two small primary valves and two large secondaries, much like a Quadrajet. The second way of telling is the 4010 pretty much had a straight side on the top plate whereas the 4011 was irregular because the secondaries were so huge. The secondaries buldged out more on the side than the primaries did. The third way of telling is the choke-horn. On the 4010, it was a wide-mouth opening and the opening faced the rear of the carb. The 4011 had a smaller choke-horn and faced the front of the carb. Hope this helps.
Nope not a Street Avenger. What is stamped on the air horn?
The secondary are bigger then the others though