Irocss85

iTrader: (1)

so, what gives? I see a couple hundred bucks. but thw 5.3's have stainless valves, and there larger. any other diff? seems like the 5.3's would be a better bargain. s.s. valves, double springs, ti. retainers. and the 5.3's have a smaller combustion chamber? is that cause there milled or just that way factory? would either have better ptv clearance aside from the valve size?

ZetaVeinteOcho

If you are going to add a power adder like spray, and/or if you are going to get a cam that is over 230, then go with the LS6, they have a bigger intake runner and are really more beneficial if you do H/C and the fast 90/90 set up.