[Mr. Wyndham]

Originally Posted by radz282003

I'm in the same boat, brother Everything you posted makes sense to me. I'm all about simpler is better. I still wonder how efficient a ZR1/LSA set-up really is though. Considering the LS9/LSA have better heads, and I know the LS9 has a bigger cam (.562"/.558" 211/230 (@.050 in) cam, the LSA has a .480"/.480" 198/216 (@.050 in) cam, and an LS3 has a .551"/.525" 204/211 (@.050 lift) cam), how does an LS3 SS put down more power at lower boost than either the LS9 and the LSA? I wonder how much of that comes from any efficiency differences there are with the manifold/intercooler arrangement between the three designs. I can totally see where there'd be a bit of power loss in the jack-shaft and the LS9 and LSA both get by this but I just wonder how the LS3 does so well.

I would have to guess that the single biggest factor is compression ratio. The LS3's is 10.7:1, and the LS9/LSA are in the 9.1:1 range.