Just saw this... Mine were all 427 gr. on the nose (bare).
I couldn't get them far enough out of the deck to get quench without making it a race-fuel-only motor (without dishing them like you plan to).
Right now they are at .016-.011 out of the hole, and with 56cc combustion chambers I'm at 10.5:1...
planning on 15:1 compression
The other problem with going for quench is the head combustion chambers are all over the place, depth wise. I have a few that are within .050 of the deck surface at the edge and some that are like .080 (with a .020 cut on the head).
I think you would have to set up the head on a milling machine and end-mill the flat area in each combustion chamber to the same depth, keeping track of where the centerline of the bores are (I guess you could use a scribe line from the bored block). Then mill the head to get the quench where you want it based on how far your pistons pop up. I don't think you would need .110 of pop-up. I bet you could get quench with .050, a decent dish and some complicated (and $$$) combustion chamber work.
for that motor the head would go to my guys in CA that have a 7 axis CNC machine, the head will be truley flat and i can have them true each chamber depth as well. as far as pop up i'll have to measure the depth on the chambers on a un cut head, see which one is the deepest, but i recall they are deep to the step. as far as the centerlines, you install the head on a bare bored block and correct (with offset pins) then open the chambers to the right diameter.
Also the reground crank I have varies .005 in deck from throw to throw, so if you want to start pushing the limits of the quench idea you will have to do some adjusting of the piston tops depending on your crank.
if your crank is .005 after a grind and index you have a shitty shop doing your stuff... but yes im going to be getting really close on the quench, see if i can leave the part number on the pistons in the head...
