Stock rod length or 6.200 for 393 stroker?

[Jac Mac]

Flow rates are fine, but one thing that bugs me when people start talking port volumes; Its only relevant when comparing say one BBC intake port to another BBC intake. Take an FE head for example- valve stem centerline to intake port face is considerably shorter and port volume lower than most other designs since pushrods go thru intake manifold.. Also if you look at many of the newer heads with raised inlet porting the volumes are larger than stock due mainly to increased runner length, but cross sectional area is quite often smaller. In this case it is Flow Quality, not Quantity that gets the job done.