I got a killer dealer on some AFR 210 heads. Sure they are a little on the big side for what I got, but I couldnt pass up the deal.

Anyways, Ive got a p600b w/ 8 rib no-slip dedicated drive setup (2 belts) making 11 psi at 5500 rpm on a 93 lt1.

Cam is a 224/236 114 LSA .589ish lift 'blower cam'.

Also, a meth/water system and 2 fuel pumps. I really didnt have any problems with detonation (or otherwise we'd be talking about an engine build).

I am getting the combustion chambers measured for both my stock ported lt1 heads and for the AFR 210cc heads. I can already tell the AFR 210cc head is a bigger chamber.

So I can then have these milled to attain the CR I want. If im lucky, they will be the desired size already.

My plan in to find out what my stock head chamber size was (they were ported pretty good so I really dont know). and mill the AFR 210cc heads to give me a final compression ratio .6 of a drop from where I am currently at.

I want to ask you all what CR you would choose if you could for this setup. I have no plans of 'upping the boost on this stock bottom end. Also, I only spin to 6100 rpm and Im done. Dont want to mess anything up.

I know in the old days, someone would say 9:1 would be ideal. However, w/ meth/water systems, it seems like Id want higher CR to keep low end performance/fuel economy.

So what CR would you target on this combo?