Posted by MikeJM on February 27, 2020 at 04:54:41 from (174.201.6.189):
In Reply to: Porting Cast Iron head posted by Jwilhelm770 on February 26, 2020 at 10:17:00:
Without a flow bench, anyone would be shooting in the dark.
Generally on old tractor engines the port is already too big.
The biggest area to improve on is the valve seat area, seat angles and the area on either side of the valve.
The trouble with certain heads, especially gas engines with chambered heads is the chamber severely shrouds the valve, to the point a very large valve might flow worse.
What model Oliver? Waukesha installed larger valves and made the ports larger as hp increased through the years. It s not uncommon to install valves from a 880 into a 77 head.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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