ok so we've all heard that the biggest we should go in a 5.3 rcsb truck is like 228 or so. My question is has anybody tried anything considered big? like 230-238 in duration? i have a a rcsb 5.3 and i plan on doing heads and cam and im just trying to figure out why i shouldnt go bigger than a 228. i have a good bit of weight reduction and im guessing the truck is around 3800 or so. so come on truck gurus, lets discuss this.