24UGTOinFL

I've used a couple of DCR calculators to look at potential combinations. The LS1 is listed as 10.1:1 SCR, LS2 as 10.8:1, and LS6 as 10.5:1. Using a 3.9" x 0.055" gasket, I had to plug in 1.65cc piston dish to get the advertised SCR. Changing only the bore, combustion chamber size, and gasket bore for the LS2 numbers, I get the right number (10.8:1). So, it appears that the 1.65cc number is correct. However, substituting the 243 chamber on an LS1 (to get LS6 SCR), I only get 10.37:1. Did the LS6 have a thinner head gasket? If not, what am I doing wrong? I need to figure out if I have the right SCR setup in the calculator. That is, there are many ways to get to a particular SCR # and I can't have any confidence in DCR if I got to the SCR the wrong way.

Also, how can I find out the duration at 0.006" for the stock cams ('04 LS1, LS2, and '02-'04 LS6)? I've searched a medium amount and haven't seen these listed. Anyone have a source?

Thanks for any help.