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11-21-2004 07:16 AM #1
For my 383ci, Heads 14102193, port or not?
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.
Ditto on the model kits! My best were lost when the Hobby Shop burned under suspicious circumstances....
How did you get hooked on cars?