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M and W pistons

Yesterday's Tractor Forums
goat64 said:
How much h p. will m and w pistons add to a 291 international
gas engine? Thanks Dave
Click to expand...
model 291 or a 291 in a model 666 ? Factory compression was a meager 7.1 to 1 . If the pistons use the standard bore size. A rough estimate would be 78 to 81 HP on good fuel, timing set on a dyno and mixture set on a dyno.
 
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