Quote Originally Posted by Fast355 View Post
Block is a stock deck, 2005ish GM 1-ton Vortec 350 crate engine. Hecho en Mexico. Where are you calculating your quench from? The top of the piston recess? My pistons are 0.025" down. The GM ZZ4 and 330 HP 350 HO ran 0.051" compressed head gaskets when they were built. The ZZ4 had flat tops and L98 aluminum heads and the 330 hp 12cc dished with Vortecs. I feel the slight compression difference advertised between the factory Vortec engine and the 330 HP crate is due to the head gasket.
I'm using the rudimentary method for calculating quench. Volume of cylinder from top of piston to deck height (.025) + compressed gasket thickness (.026) = .051"

My SCR I used the calculator at CSG's site (http://www.csgnetwork.com/compcalc.html) and DCR with the calculator at Wallace Racing's site (http://www.wallaceracing.com/dynamic-cr.php). I'm calculating at 340' altitude for mine, just above the sandhills region of NC. I asked about intake valve closing after BDC to get a ballpark of how much DCR you'd be running. You have more than I thought you might. A lot of folks I've heard say above 7.8-8.0 you'll want to run gas with an octane rating higher than 87 vs. detonation. Being that almost all 87 octane fuels have 10% ethanol it actually pads that ever so slightly. How much would be pure speculation. But I'm accounting for the difference in stoich for ethanol blended fuels in my EBL/TunerPro stuff.