For my 383ci, Heads 14102193, port or not?

[larry0071]

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.

[larry0071]

Well, I got the first one completely ported and moved to the second one. I started with the exhaust ports and did the usual bowl blend, opened the port to full width where it knecks down in the middle of the port run, removed all the foundry flashing marks, made a wedge shaped entry and exit around the valve guide and lowered the valve guide a bit, smoothed and radiused the entire port and finished up all 4 ports before moving to the chambers. After I was just about finished polishing the chambers I noticed thru my dirty safety glasses that there may be a crack coming from under the valve seat and wrapping up and into the chamber going acrossed the face of the chamber. I stopped and got the MAGNAFLUX penatrant cleaner, penatrant, and developer. I cleaned all 4 chambers and applied the red penatrant dye, waited 10 min and did my cleaning, then applied my developer.....brighter than the sunlight on a hot summer day was a ugly...nasty...bright red crack just where I suspected. So now I am looking for a replacement head. Im mad!

[larry0071]

Here is the crack, I found 2 cracks with the PT exam, both on the center 2 ex seats and both start at the Ex gas port cut into the bowl and travel up and thru the seat into the chamber. The other head is fine.

[larry0071]

I CC'ed them and had the shop CC them. I used oil, they used alcohol or something. I got 76cc's and they got 74cc's. So it appears that the 193 castings are 74-ish cc's. Im still torn on getting the parts from the machine shop and going with the 400 rods or going with Brian Adams from ADperformance.com and using the 5.7" rod. Brian emailed me a total price of 1050 for Scat crank, eagle SIR rods, Ross Pistons, Pioneer ballancer and flexplate, all bearings and rings for the Ross pistons, the rotating assembly will be ballanced. This will cost a bit more but still be similar to the cost of using the machine shops Eagle crank and stock 400 rods. I'm sort of thinking the new rods and Scat crank are worth the little bit of clearancing that will be needed, but the guy at the shop is really trying to talk me out of it.

[res ipsa]

See this thread for flow data & discussion on the 193 casting (suffix number) heads.