DeTomaso Mailing List: April 2000, Message #253

John wrote:

>[snip}  Just pulled the edelbrock "F351-4V" manifold off to polish 
it.  But the port size difference between the two jumped out and bit me.  Got 
out the vernier caliper and measured the two.  The heads are big 2.5" x 1.75" 
 and the manifold measured in at 2.15" x 1.38"

>>>I believe one of the Dan Joneseses determined that Edelbrock purposely 
made the intake runners undersized because they felt the 351C-4V ports were 
just TOO big for efficient combustion.  Reducing the side of the port (while 
keeping the volume of air/fuel flow the same) results in increased velocity, 
and presumably more power.  The mismatch when the air is flowing from a small 
to a big opening is a relatively trivial problem; it's when you are trying to 
force air from a big hole into a small one that you run into difficulties.

I believe...:>)

I think you're okay.

Mike