My 6.1 retrofit thread
Pic 5 - shows the new seal in place with the shim and locater - no need for shonky make do cages with these springs....
Pic 6 - #1 intake valve spring all done (at top of pic) ...15 to go!!
Then do the exhaust - in this case less the shims
Rotate the crank 45 degrees to find TDC for the next cylinder as per firing order....1,8,4,3,6,5,7,2 and repeat process.