Just dug out the cam card and the spring requirements say closed 210lbs at 1.938 and open 650lbs at 1.278.

I checked last night at my k-motion springs are installed at 2.00 inches which is 245 on the seat and they are near 700 at 1.300.

Yes it is a single shaft system and with the 1.5s the cam lift checked 672 intake and 688 exhaust checking it cold of course with the lash.

I am going to stick the 1.6s on the intake side to try that out first.

Not gonna get to try it this weekend as my son and daughter in law are having a reveal party for our first grandbaby! And i darn sure ain't missing that over a dang ole race car!