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Need some help warning up my stock U's

V

VintagePrairieIron

New User
I have a '49 UTS and a '56 U Special.

I pull with both in our local stock tractor pulls.

Tractors must be stock displacement, and mist use parts that came on the tractor from factory. That said, a bit of an overbore is ok depending on what pistons are available.

The UTS has GE30E heads with new valves that I spent way too much on before I knew better.

The U Special has 10A4210 heads and makes decent power, but not enough to always be competitive.

My questions are:

- What pistons are available for a low budget build? (both tractors have stock worn bores right now)

- Can I shave these heads to get a reasonable bump in compression?

- Can I shave the blocks to bump compression as well? Or leave the block gaskets out? (Not sure how far the pistons are down in the bores....)

I have access to a machine shop at work, I have a sonic tester etc so I'm willing to try shaving some parts if it helps.

Thanks!!
 
Both the moline parts books and old
M&W show using the 336 ( M5 ) jugs as
a big bore or power block replacement
for the U. That will put you at 336
ci. Going with the 4 3/4 over bore on
that makes 354. Put a higher
compression head on and you can
double original horsepower. Find a
336 power unit and you should have
all the parts you need. If local
rules allow any " factory specified "
over bore, you are 100% legal.
 
I thought you meant "to stop by and help you drive them until the engine temp comes up to operating value". Grin!
 
I have a used set of 1/8" overbore 283 pistons. They would be the largest you can bore your stock blocks and were an overbore piston available from M&W. M5 blocks would have a different casting number, which depending on how strict the rules are where you are pulling, may not be allowed. Bigger is always better though if you can get away with it.
 
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