im gonna guess..........price, plus they are all great motors even though they aren't ls's. The 5.3 and 6.0 will out perform the 350 even with mild builds and the 4.8 might be small but it will still contend with a sbc chevy if not beat it.ZQ8-97 said:Guys the 4.8 / 5.3 / 6.0 are all steel block engines. The only aluminum block is the LS1 making it even lighter than our stock 4.3. Why would you want to go any other way?
Yeah, I was also impressed by the 5.3, my brother just bought a 03 z71 and that thing is fast as hell. Supposedly they made some small changes on the 03's compared to the 02s, i personally dont know. But chevy is really putting out some wicked stuff right now. Cant wait to see how the 5 cylinder runs in sbanger replacements, somehow i have a feeling it wont be mild by any means. anyways, my point is, for stock trucks chevy is putting out some pretty wicked power houses.Rhansen said:The better cyl. head design of the 4.8,5.3, +LS1 will make more hp per cu. in. than the previous designs, I just think it would be more expensive to build. I've driven a couple of fullsize w/5.3 motor and is surprising how strong they run, but I wouldn't mess with it unless I had a donor truck to pull from.