Valve Seats 59AB block

D

dschwartz

Senior Member
59AB block I want to use stainless steel valves 1.50 for the exhaust and 1.60 for the intake do I need to change the seats, if so where do I get the seats.
Thank you
Dan Schwartz
 
I don't recomend SS valves unless the stems are chrome plated. Cutting the stock intake for use with the 1.6 valve weakens the seat and it might come loose. Unless you plan on running over 4000 rpm the extra size won;t matter. A good port job would be better, but few people know how to do this.
 
You can use bronze liners also but all this work won't give a noticeable hp inc on the street. Many other mods would gain better results.A balance job is also a fine touch.
My 2¢

Ronnie
 
Stay with the original 1.5" valves... What you gain on one end you lose on the other. Would only benifit top rpm anyway... Listening to others, lots of people cam and valve for high rpm, and need low and medium rpm...
All garnered by listening to the people I deem to be wise...
Karl
 
"A good port job would be better, but few people know how to do this."

Ok, Ol' Ron, HOW do you do a "good port job"???
 
For those of you that have my book can seethe bottleneck between the port and the valve pocket. For street I remove aprox. 1/4" of metal on the bottom of the port at the entrance to the valve pocket. I remove the hump and blend in this area. Takes about 10 minutes with a carbide bur on a die grinder.
Next I remove metal from the top of the port to straighten it into the valve pocket. A micrometer can be used to measure the stock removal through the water jacket. I keep this at aprox .125". This can be don with the same carbid bur, bur should be finished with a 1/4 round coarse file. another 10-15 minutes. last but not least the pocket can be cleaned up and blended into the port. Make sure the pocket has a nice radius going into the port.

Now come the valves. The Chevy valves are designed for OHV engines and have a different flow angle on the bottom of the valve. This can be improved by cutting this at a 20 deg angle, for street I keep the 45deg seat angle. However I run a .060" intake seat and a .075" exhaust seat. The undercut valve should remove any excess material. I use STOCK FORD VALVES.
My flow bench said this improved flow aprox. 10%. With the proper tools this can be done in a few hrs. Unfortunately it has very little affect on power below 4000 rpm.
 
Hello
Thank you, you make ford barn fun, the information that you have given me for my flathead is very much appricated.
Dan Schwartz
 
Capn John said:
Thanks Ol' Ron, I tried search but no could find, can you give me a lead in to YOUR book?
Click to expand...

I have read Ol' Ron's book 100 times and it is one of my favorite and most straight to-it flathead books. I recently purchased a fresh copy from someone whom is selling them here on the barn.
 
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