We have ran LS since 2014. Started using the ct525 in ump. Even made half the summer national shows that year with them.. in 2016 we did modify them with Baldwin. We can make close to 700 with 93 octane pump gas and still us a hydraulic cam. We got around 3000 laps before we had a stock valve fail. Bearings, rings still looked new. Can't do that with a sbc!