Curtis,
I’m running PAC titanium retainers, w/ 10 degree locks and knock-on-wood; those retainers have held-up really well. My closed seat pressure is 240 and open is 625. Also, I’ve run my PAC-1243 endurance springs two to three seasons (two sets now) and the pressures (closed/open) are still spot-on. However, I’m installing new 1243s again this year just to be on the safe side. Additionally, I have Boyd’s do the valve job, then I do the assembly (I have my installed height gauge, shims and valve spring compressor).
Warren