super sucker

805moparkid said

very true...

what i think it might make a difference with is adjusting runner length... i.e. pulse tuning... also adjusting plenum volume to a correct size...

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I agree. I use open spacers all the time to add plenum and help the air turn. The truth is, if a shaped spacer adds a bunch if power, the engine probably does not have the best intake, carb, or intake and carb for the combo.