[johnta1]

Try a texture like shark skin on the tube.

[dci]

Originally Posted by johnta1

Try a texture like shark skin on the tube.

LOL, I already do that !!!!

John I used your calculator for port csa for a set of my RA5 heads I'm porting for a guy and after doing the port it looks really big. It's a 541, 4.375" bore, 4.5" stroke, 8500 rpm deal. I came up with a 4.5" csa at the push rod tube tapering down to the bowl 3.31" 92 percent of the valve. The opening at the tube is 2.50" x .980" on both sides of the tube minus the radius in the corners. I haven't flowed the head yet, but I'm a little concerned. I guess I'm just used to looking at E-heads and this looks big. I suppose because it is basically 2 E- head ports in one RA5 intake port LOL. I have to admit though I thought my RA5 intake port opening in the plenum was to big (2.650"), but that's definitely not the case. At least not on my 455 I built. That thing rips through the r's. What's your thoughts?