Diesel Freak Clip Of The Day 1997 NFMS Wayne Longnecker River Rat. Because Allisons. 1997 would be a bit of lean year for Wayne running the then (and again) max of twin turbo Allison and factory blown. In later years with the Outlaws, he would switch to Merlin power only to see it legislated against. Today, River Rat has 2 blown hemis. Just as competitive and likely cheaper, but boring.