I have begun to do an exhaust only clean up.

I removed the foundry mark that travels longwise down the 3 and 9 O'clock position on the ports, I also radiused the area on each side of the valve guide to try to get a bit less turbulance there. I then went and used stones on my air die-grinder and generally smothed the entire port and the entire combustion chamber.

Next step will be to finish it all off with sand-paper drums to get it as smooth as I can.

Should these ports be opened up any, or should I just stop here?

BTW, these heads are not exactly what I thought they were, by looking up the numbers I see that the heads ending in 193 are NOT high swirl intake ports, the heads ending in 191 are. Mine are 193. Yet I see other sites list these 193 heads as high swirl! So is this intake port good enough as is to feed a low RPM (4500 RPM and down) 383 or 389? (I may consider doing a .040 or .060 over rather than the 0.030 over.)

I have found these heads on this site as a 74-76 cc head, and I also have located information on remanufacturer sites that list this head as a 65 cc head. Also, it appears that some do call it a "High Swirl" design, while others say it is not a high swirl design. Does anyone here have any insight into any of these questions from what and how far to port, to what are the chamber sizes exactly so I know what piston to order to keep this thing under 9.0:1 compression. Thanks guys.

Here is a quote from one of the reman shop websites about these heads:

CASTING NUMBER 14102193
SWIRL PORT INTAKE PORT DESIGN
65.3cc COMBUSTION CHAMBER
1.94" INTAKE 1.50" EXHAUST VALVE
"THIS CYLINDER HEAD IS NOT A PERFORMANCE ORIENTED CYLINDER HEAD. IT IS CLASSIFIED AS A HIGH SWIRL HEAD THAT WAS INTENDED FOR GOOD BOTTOM END TORQUE AND FUEL ECONOMY. THE INTAKE RUNNER IS RESTRICTIVE BECCAUSE IT HAS A RAMP CAST INTO THE BOTTOM OF THE BOWL TO PROMOTE HIGH SWIRL."

Larry.