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I am just learning about carbs, I kind of understand the theory, but why do the FCR, HSR, etc. give a reported 10 hp over stock? I know they have a bigger bore and are more adjustable to fine tune the fuel delivery, and that they are not vacuum operated like the CVs. Would they be a logical power progression after an airbox removal and good exhaust, before cracking open the motor? Oh, another question... I assume that without the proper pistons, oversized valves can not be fitted. Is that true? Thanks.
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