I have a Weber TC head in my possession that has intake "throats" (as measured at the end of the runner where it mates to the carb) with a diameter of 45mm. It is my understanding that 1) this dimension on a standard Weber head is 40mm and 2) on a Weber 40DCOE the throat diameter is 40mm. The question is, if 40DCOEs are put on this head, will the abrupt change in diameter cause turbulence or a pressure drop and adversely affect performance? If so, what is the best course of action to correct this situation? Buying 45's? or making custom spacers to go between the carbs and the head that provides a smooth "aerodynamic" transition?
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Steps up and down have some strange effects in both exhaust and inlets and can be negative or positive depending on how done due to the pulsating waves in the inlet and exhaust
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