If you guy's cars are above 100k miles, and you're still on the original timing chain and gears, it's highly likely that you're sucking pieces of nylon gear teeth thru the baffle in the oil pump intake screen! These pieces will gather around the intake hole and block enough oil flow to cause lifter tick!
Here's a quickie troubleshooting test you can do...after it starts ticking, shut it down for ONE minute, then re-start. If it DOESN'T tick immediately on re-start, chances are you have gear teeth in the oil intake! (The teeth will fall away from the intake passage, allowing enough oil pressure [briefly] to stop the tick!)
If it DOES tick immediately on re-start, then you more than likely have another problem, as Louie suggests! The new springs CAN take out old lifters!