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351c help!!?!?!

  1. Whats the differene between 351c aus heads and american heads

    Classic Tech
    Whats the difference between 351c 4V closed chamber heads and 351c 4V closed chamber american heads? I have a 351 cleveland with a 650 double pump carb and an aluminum 4V intake and the heads i have on the truck right now are 4V open chamber heads BUT i cant find ANY headders because they are...