Maximum bore of a Farmall 450 C-281

45Farmall M · Jun 26, 2017

I have a 450 block sitting around and want to put it in my M. I was considering boring the M block but it's a 1945 so its cast thinner, in other words useless to bore out. Just wondering how big I could bore the 281 block and be able to put another IH piston in. I am on budget but just seeking advice. Thanks.

BarnyardEngineering · Jun 26, 2017

Those engines use replaceable sleeves so you wouldn't be doing any boring, unless you're trying for something exotic. If you're going for something exotic, I doubt you'll find an IH piston that will fit.

The stock bore on the sleeves is 4-1/8".

randy hall · Jun 26, 2017

puller suppliers have 4 3/8" pistons to put in a bare 450 block. call gary baker in Manchester Michigan.

BarnyardEngineering · Jun 27, 2017

Right, but that's not an "IH piston" as the OP asked for.

Maximum bore of a Farmall 450 C-281

45Farmall M

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