diff. between TSP 5.3's and LS6 heads?
 

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?

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.