Thanks for the response, HCB. My dilemma is not being able to get a correct spring to fit with a 2.050 max installed height, yet still allow .850 net lift. The 947 springs I have now are supposed to be in at 2.000 which only allows .810 max net lift if everything is perfect. My head porter set me up with +.050 locks and +.100 retainers(?) to get me as much room as he could.
There are guys running faster than me with 440-1 heads, and I feel the need to catch up, maybe pass em
After reading a bit of the YB thread, I think I will go out to the shop and do a little measuring.!!