Re: V4/V6 family opinions & questions

[Don]

Do you mean put the XL gearcase on the 20" stack? Or, do you mean putting the good powerhead on the XL stack? Well, the good powerhead will go right on the XL stack, no problem, provided both are actually 1988 models.
"I think" the bigger XL gearcase will fit on the 20" stack, the problem is you will have to change out the driveshaft/shift rod, which means disassembling the gearcase.
Like Dan says, these engines really only have two carburetor assemblies, maybe the way to think of it is the engine has two 2BBL carbs….