6-71 vs. 8-71

GTXperience said

Map63, if interested, I may be selling my new Dyers SB blower intake (still in the box).

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Ok, a Dyer's 6-71 manifold, how much ? Not a 6V-71,(about 2" shorter on length)? I ask because Bill uses both styles. "Short" one moves about 10% less air. Thanks, ateam.8)