Well I am putting the xr 274 hr in my daily driver 350 build and my other motor is going to get the 288 xr xtreme energy cam. If it makes a little noise I don't really care the main thing I care about is it lasts and runs good with my setup and gives good response etc. I would go with it if I was you my daily driver is 224/230 @50 duration 502/ 510 lift and my weekend warrior will get the 288xr wich specs at 236/242 @ 50 with 520/540 lift. Its replacing the big mutha thumpr roller I currently have in my weekend warrior build. Try to read more in a goole search on the XE cams and see what others think. It takes more then a few peoples opinion to convince me.