check what I wrote on noisy lifters
http://www.challengertalk.com/forums/f37/hemi-tick-378226/
see below cut paste from the Dealer Service Manual / mine can be super noisy when I drive like an a hole around the city and the oil is super hot etc...though constant abuse at the track makes it better
if you have a catch can i would inspect your oil caught;
i would not worry about it unless at 2000/3000 or above the tick persists and becomes a clap clap clap noise then you have something wrong
my tick goes away the second I reach 1k rpm and pressure reaches in the high 30's 40's and above
if you dont drive the car often I would not be surprised the lifters are not filling with oil thus their noisy operations
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09 - Engine, 6.4L / Engine Block / LIFTER(S), Hydraulic, Roller / Diagnosis and Testing
DIAGNOSIS AND TESTING - HYDRAULIC ROLLER LIFTERS
Before disassembling any part of the engine to correct lifter noise, check the oil pressure. If the vehicle has no oil pressure gauge, install a reliable gauge at the pressure sending-unit. The pressure should be between 207-552 kPa (30-70 psi) at 3,000 rpm.
Check the oil level after the engine reaches normal operating temperature. Allow 5 minutes to stabilize oil level, check dipstick. The oil level in the pan should never be above the FULL mark or below the ADD OIL mark on the dipstick. Either of these two conditions could be responsible for noisy lifters.
OIL LEVEL
HIGH
If oil level is above the FULL mark, it is possible for the connecting rods to dip into the oil. With the engine running, this condition could create foam in the oil pan. Foam in oil pan would be fed to the hydraulic lifters by the oil pump causing them to lose length and allow valves to seat noisily.
LOW
Low oil level may allow oil pump to take in air. When air is fed to the lifters, they lose length, which allows valves to seat noisily. Any leaks on intake side of oil pump through which air can be drawn will create the same lifter action. Check the lubrication system from the intake strainer to the pump cover, including the relief valve retainer cap. When lifter noise is due to aeration, it may be intermittent or constant, and usually more than one lifter will be noisy. When oil level and leaks have been corrected, operate the engine at fast idle. Run engine for a sufficient time to allow all of the air inside the lifters to be bled out.
LIFTER NOISE DIAGNOSIS
1.To determine source of lifter noise, crank the engine with cylinder head covers removed.
2.Feel each valve spring or rocker arm to detect noisy lifter. The noisy lifter will cause the affected spring and/or rocker arm to vibrate or feel rough in operation.
NOTE:
Worn valve guides or ****ed springs are sometimes mistaken for noisy lifters. If such is the case, noise may be dampened by applying side thrust on the valve spring. If noise is not noticeably reduced, it can be assumed the noise is in the lifter. Inspect the rocker arm push rod sockets and push rod ends for wear.
3.Valve lifter noise ranges from light noise to a heavy click. A light noise is usually caused by excessive leak-down around the unit plunger or by the plunger partially sticking in the lifter body cylinder. The lifter should be replaced. A heavy click is caused by a lifter check valve not seating or by foreign particles wedged between the plunger and the lifter body. This will cause the plunger to stick in the down position. This heavy click will be accompanied by excessive clearance between the valve stem and rocker arm as the valve closes. In either case, lifter assembly should be removed for inspection and cleaning.
4.The valve train generates a noise very much like a light lifter noise during normal operation. Care must be taken to ensure that lifters are making the noise. If more than one lifter seems to be noisy, it's probably not the lifters.