Our little club has about ten full time racers, sometimes more sometimes less but we are all up in the air about what engines are strong enough to handling the abuse of almost WOT oval racing. Nobody is getting long life in their engine. My LHS guy says we should be running on-road engine because they are built to sustain high rpm more than the typical off-road engine. Sure my Novarossi has lasted longer than most but there are people in Nitro-Off-Road claiming to get 10+ gallons. I bought a GRP because it suppose to be a top-end engine but am yet to finish break-in. Any recommendation???