Originally Posted by automotive breath
Again using the trick flow head I highlighted the places I remove material.
On the left the port turns around the push rod. I open up this spot to slow
the air speed as it makes the turn. You must be careful here or you will break
through. Measure the width of each port at the turn to get them all the
On the right in at the beginning of the short turn I widen the turn on both
sides. I only put the arrow on one side but I do both sides. Again this is to
slow the air speed at high RPM.
On this head I worked the guides, on the RPM heads it's just the bronze
sticking up so there is nothing to do there.
The rest is just blending every thing in. Notice I don't try to get the surface
smooth, just eliminate rough casting and imperfections. In all I only remove
about 5 cc of material.
Why would you want to slow the air speed down at high RPM?