I've been wondering for awhile about how high certain or all straight 6s can rev to if built to withstand it. Like in one magazine theres a car with a Pontiac OHC straight 6 and for one of the pros it says "shifts at 7200rpm" but then when reading in the racing here it says one member is going back from a 292 to a 250 becuase he liked the high revs. I know it should be safer to do this in a later block becuase of the 7 main bearing. But really what I want to know is what engines can rev easily to 7000rpm?
