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Honestly on LSx motors I have yet to see primaries that are too big. Back in the 4th gen days people thought 1 7/8" were too big for an LS1 and you would lose power. I dynoed 1 3/4" and 1 7/8" back to back on a bolt on only car (no power adders, no cam) and lost zero power down low and gained a few hp up top. The same exact thing has been proven on our LS3 motors with the 1 7/8" vs 2.0" primaries.
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