5.3l cam decision
I wouldn't do the GM springs on a project vehicle, but I would consider on something I am going to put a lot of miles on potentially hauling people, etc. The GM factory springs leave a lot to be desired but we've all seen them go 150K-300K depending on the engine.
Is there data like that out there on the popular single and (especially)dual setups? I haven't put but 10K miles at most on any of my duals personally and planned to check them real closely if I ever got to 25-30K+. Then again, my work schedule, 30K will take a very long time at my current rate.
Tsp does offer them as an option with cam kits and on heads if that gives you any indication.
But no long term tests ive seen.

