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Originally Posted by My427stang
Farmall, none that I know off.
However, the 390, 427, 428 and 406 used the same rod length, so to build a real 406 you just need 406 pistons.
I am pretty sure Diamond sells the proper piston
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Thanks for the reply, Stang. From what I've been able to determine, Diamond carries 0.020 and 0.030" over pistons for the 406, but they're kind of pricey compared to some good deals I've seen on 428 pistons. It is my understanding that the pin is positioned differently in the 428 vs. the 406 due to the former's longer stroke of 3.98" compared to the 406's 3.78" stroke. Seems like rods would be cheaper and easier to have made than would custom pistons. Just a thought on the inexpensive side.