Quote:

You can use a 4.15 crank,6.57 rods with a 1.30 cr-height pistons that combo works real well in a low deck.



The 1.320 Ch piston that is available will work with 3.75 , 3.9 and 4.25 strokes with just a rod change.
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I'll actually ANSWER the OP question There isn't a shelf stock piston but as mentioned above any of the manufactures will make you one , EXCEPT KB ... You need a piston about 1.520

Diamond actually lists one for a 383 but not a 400 ??? odd ...