Piston Question

super H · Aug 7, 2009

I have a set of pistons with the # 374265 R1 on the top. What motor do they go into? What would be the bore size.

Bob · Aug 7, 2009

According to "GOOGLE": (I'm not claiming the info is correct, though!)

M International Parts
Part Number: 374265R1
Part Name: Piston
Description: 4.00" overbore step head piston pin & retainers included.

Jeff Z. · Aug 7, 2009

I don't know what they are out of but if you measure the piston with a micrometer at the wrist pin and add around 0.002-0.003 to it that should be the bore size.

D Slater · Aug 7, 2009

If my memory hasn't failed, thats a fire crater piston for a M or C-248 engine. 4 inch bore standard altitude. Can't remember if that one uses a small or large piston pin. If the pin is roughfly 1 inch its the small pin and needs a adapter bushing in a stock M rod to use.

Piston Question

super H

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Bob

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Jeff Z.

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D Slater

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