C 221--C263

farmall Dann · Sep 3, 2010

Bought a block and crank for my 460 gas was suppose to be a c221. Got it home cleaned it up turned out to be a C 263 from a early 706.The bore is the same. Question can I put my c221 connecting rods and pistons in it?I was told you can not put a c221 oil pump in a C263? Did some checking -- The connecting rods are same camshaft same, head same, valves same push rods same, Piston rings are different 3/16" c221 1/4" c263 is that the only difference? is the pin location same? will the C221 piston with a C263 crank making proper compression? Will it fill the hole? Will my C221 Distrubitor work? Fly wheel? Thanks!!!!!!

mkirsch · Sep 3, 2010

If the bore is the same, and the rods are the same, the C221 pistons won't work with the C263 crank. They will hit the head because the wrist pins are too low in the piston body.

From what you say, it sounds like IH got more cubes by "stroking" the C221, similar in how they designed the 400-series diesel engines.

In order for a stroker to work with the same rods across the board, the wrist pin location in the piston has to move down for shorter strokes, and up for longer strokes.

Of course, I could be having a stroke and everything I said is totally backwards of reality... I'm working this out in my head as I go.

pete 23 · Sep 3, 2010

You will have to get different pistons, 560 or 706 due to different placement of pin hole to accomodate longer stroke. If you use 706 they are fire crater type, 560 may or may not be depending on supplier. If they are you should reduce max advance of spark to 22 to 25 degrees as 460 is 30. All other parts will work. I have seen a few guys just trade crankshafts when they are majoring a 460 as they are putting in new pistons and sleeves anyway and stayed with all the other original equip.

C 221--C263

farmall Dann

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mkirsch

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pete 23

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