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Super H 1954.

I don't think they are aluminum. 16 miles per hour isn't fast enough? I don't know how many more rpm's you can safely get out of it.
 
Standard piston for a SH gas was aluminum. Be very rare if the same ones are there now. Standard replacements would be aluminum also.
IH turned utility tractors with the same engine family up to around 2200 RPM.
If you really want more road speed put a SW4 ring and pinion in.
Far as safely doing any of the above there's always some danger so its up to you on what you want to chance.
 

Why would you want to run them fast? As old as they are anything can break at any time. Then we will reading another tractor accident report.
 
I get my H in road gear and I gotta tell you , its fast. I would run the rpms up as a way to get more road speed long before swapping gears.
 
I just happen to be reading my old 1939 "H" owners manual, how it talks about how these tractors are designed to sit high for cultivating, and turning cannot be done at high road speeds without danger of overturning. How wheel weights lower the center of gravity for safety. How braking a high "H" can be dangerous at high speeds. There"s a big "CAUTION" about never turning sharply in exzcess of 5 mph.
 
Our "53 now has aluminum pistons...been about 3 years so I honestly don"t recall what the originals were, we have it set at Factory rec. RPMs as we pull Div 1 and get tested. It runs about 22 mph wide open on 12.4x38s; only tractor we have that is faster is the 2N Ford with Overdrive
 
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