Well I never actually hooked it to a sled with it turning 5200. Only to tractor in the field testing it. But I couldn't leave it like that it wouldn't idle at all. Running a 3.0 charger biggest cam colt has without going to line bore, stage 8 I think it was he gave me specs but I can't remember. Right now I can leave the line at five but it will pull down to 4500 or so. Few other guys here running pretty much exact motor I have except they said they leaving line at about 5500. And falling to around 5. Listening to our trucks, that sounds about right