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flathead pistons and 8n ford tractor pistons


Guest knightman

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Guest knightman

does anyone know if the pistons for the 239 flathead v8 are the same ones used in the 8n ford i know both have the same bore and stroke thanks

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Guest DeSoto Frank

The tractor pistons may have a different "pin to crown height" for lower compression ratio; tractors were designed to run on low-grade fuels ( cheap!).... IIRC, CR on an N-model Ford tractor is around 4.5:1. Probably lower than the automotive version.

Which engine are you trying to source pistons for ?

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Guest knightman

i was just wondering if they were the same as i have 6 good standard pistons for the 239 i recently redone some 8n and i remembered they had the same bore ,stroke and pin sizes thanks for your help i will measure the height of the pistons also i noticed the pistons from the v8 fit the sleeves for the 8n so i wll go from here thanks for the reply knightman

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Guest DeSoto Frank

Don't know about the compatability; measure carefully before trying them out.

If there's no clearance issues with the head, they will probably work; if they give a higher compression ratio, then your 8-N will have a little more power than stock.

Shouldn't be an operating issue unless you're running distillate or kerosene in your tractors !

The N tractor engine was also available in the '40-'42 Ford truck, and is indeed basically one-half of a flathead V-8.

I've also been told by old-timers that they used to use flathead Plymouth pistons in the Gravely model L walk-behinds...

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Guest knightman

thanks for the reply it makes sense that they would be inter changable as os many other things on the flatheads were thanks again and merry christmas knightman

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