Seem to have a lifter tick that is getting a little louder every time when i first start it up for the day... It goes away after about 5 minutes. Time to re-adjust the valve lash? ...If that doesn't get it is it time to replace the lifters? I've heard something like mixing in a quart of ATF for a day and then changing the oil might help clean out a sticky lifter b/c of the detergent in ATF? It's a 350 with a 'vette cam hydraulic lifters, probably about 50,000 miles on the cam and lifters. Any tips?