tickin or tapping sound not a lifter or rocker PLZ HELP

[lestat2220]

i have a vt v6 and started geting a quiet taping so befor the problem got worse i ordered some 1.98:1 ULTRA HIGH RATIO ROCKERS and some crow cam lifters from mace engineering i figured why not upgrade while im replacing so i riped the top end down installed it all acordingly now the tick/tap is worse not by much but never the less still worrying when i accelerate so does the sound any help would be great thanks

[MACE]

Give is a call when you get a chance as it could be a number of things.

Cheers,
Steve

[graham7773]

Mace/Steve, I have a similar noise, not fixed by new lifters. Changed #4 rocker and pushrod on suspicion, no good.No mechanic I have spoken to and had listen to noise has a fix to suggest. About 5 so far. If you have any suggestions, I would be glad to see them. I am hoping it is not gudgeon/wrist pin

Holden gives this list of things to look/listen for and I have included it for the benefit of other members with the same problem

A light tapping at one half engine speed, or any varying frequency, can
indicate a valve train problem. These tapping noises increase with engine
speed.
Before attempting to judge valve train noises, thoroughly warm up engine.
By doing this you will bring all engine components to a normal state of
expansion. Also run the engine at various speeds and listen for engine
noise with the hood closed while sitting in the drivers seat.
If the valve mechanism is abnormally noisy, remove rocker arm covers and
use a stethoscope to determine which valves or valve train parts are
causing the noise.

Valve train noises may be caused by one or more of the following:

1. Broken or weak valve springs.
2. Sticking or warped valves.
3. Bent push rods.
4. Dirty, stuck or worn valve lifters.
5. Damaged or improperly machined camshaft lobes.
6. Insufficient or poor oil supply to valve train (low oil pressure).
7. Excessive valve stem to guide clearance.
8. Worn valve guides.
9. Worn push rods.
10. Worn rocker arms.
11. Broken rocker arm stud.
12. Loose or worn rocker arm attachments.
13. Missing or mis-positioned lifter guides.