De-stroking a GX390 clone questions

Brian B.

New member
I have a Duromax 440 i am building, i want to de-stroke the engine to allow it to rev much much easier& for longevity.

I know the 390’s crank will fit the newer 10 bolt Duromax’s, but i want to really create an over square motor and install the GX270 crank.

Does the 270’s crank bolt right into the GX390 clone family’s block?

I realize i have other work to do after from the conn rod up/ that’s not my question, will the 270 crank drop right in?



(The high rev de-stroker would end up around 386cc)
 
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