Is there any interest in doing a PAC Valve spring GP?
PAC is the original manufacturer for the Comp 918s until CC decided to go to another manufacturer (and we have seen problems since). These are beehive springs and drop right into the LS1 heads. If you want new locks/retainers I can work out a deal on those as well.
I normally do the 1218s (CC918 equiv) for $165 shipped. This spring is good to .600 lift.
And the 1518s are nitrided and good to .650 lift and those are $235 shipped.
If interested please post and we will see if there is enough to move forward.