I help with a few trucks... 224/224 is basic camshaft if you ask me... I have an 2004 ex cab ls6 with 234/240 with a yank3600 and it was pretty good all motor... pushed full body ex cab LT almost in the 12s on motor... But i drove it last night 40-50 miles.. Truck acts ALOT different going from 28" slicks to a 30" street tire... 598 598 228/232 114 dont foget good springs and pushrods