Agree with LonzinomakerCS, also, boil for how long, and for what purpose? If it is to reduce fat, the smoker takes care of that with a low and slow smoke. If it is to tenderize, that also is unnecessary when smoking ribs. You cook them to tenderness not to time. The closest thing I can remember is as a kid we had just a charcoal brick grill outside so we par-cooked country-style ribs and chicken in the oven so we could char them on the grill without under-cooking. Sorry, not seeing a reason to boil pork ribs, and a lot of reasons not to.