what cubes? i may of missed it-if so sorry....also good heads are a prerequisite for good nitrous results...especially good exhaust side,typically a cam that is nitrous friendly will have a lil more exhaust duration and or lift than a n.a. exhaust...
never had an avenger, i dont know of anyone that has one personally....double pumper is a hard one to beat especially if u wanna do some 1320 laps
carb size is dependent on size of motor and operating rpms. you said max around 5300 so if it is around a 355 that is warmed up, id say 650-700 should be good, if it was same but a 406 or bigger, then id start at a 750 and go as much as a 950
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