Very loud tapping coming from top end. URGENT please help!!

[SKNOT9]

Ok i have done a search and cant find anything like my ticking being talked about. On the weekend i replaced the inlet manifold gaskets and dropped the oil and new oil filter. a have been driving about 100km since i worked on it and i go out to start it up tonight and it is making a chronic ticking/tapping noise sounding like it is coming from the plenum chamber. And this isnt just some little old engine ticking, it sounds so unhealthy that i dont feel comfortable driving my car until it is fixed, and im taking my GF to the show saturday so i need my car!!, it gets louder and increases frequency as RPM in increased. Is i would have instantly thought it was from the work i did on the weekend but it drove fine for a couple days. Does anyone have any idea what this is. PLEASE HELP!!! ps my car is also reving at about 500rpm on idle now since the ticking started, used to be about 800rpm

[Peanuts Inc.]

sounds liekone of your lifters is blocked from carbon or gasket deposits or has had coolant in it from taking the manifold off, it happens alot when the manifold gaskets are changed
run some engine oil flush thru it and see if the problems goes away, if it doesnt then track down the suspect lifter and replace the pair of them for that cylinder

[SKNOT9]

but how come it didnt happen straight away?

[Peanuts Inc.]

a piece of carbon could of dislodged from the manifold after you put i back on and blocked a lifter or pushrod gallery.... could of been floating around for a while and eventually jammed itself somewhere

[SKNOT9]

so to check i need to take off the rocker covers and take a peek?

[Peanuts Inc.]

run the oil flush thru it first.... if it doesnt go away then check your liifters

[SKNOT9]

u just mean adding the additive? or re filling the oil? sorry for the dumb questions lol i appreciate the help

[Classifi3d Calais]

drop the oil again and start fresh,
is the noise from the driver or passenger side bank?

[SKNOT9]

neither, or both. middle? lol sorry but yeh like i said it sounds like its coming from the plenum chamber, opened it up, had a look, cant see anything

[caseyhelen]

hows your oil psi i had the same problem on a vn abit of gasket made it to the sump
than the oil pick up , started as soon as i put it back together makes it sound like a lifter

[DavoVP]

I have the same ticking on my VP, except mine comes and goes as it pleases, rear right. Narrowed it down to the lifters. Gota replace em eventuly.

[SKNOT9]

had a closer listen realised it is in the passenger side rocker cover. when i was pulling the rockers off i noticed that one of them can rock even though the bolt is done up tight. its like the rod is too short and not pushing the rocker up enough

[greenacc]

could be a dud lifter , but funny it just started after you worked on it. I reckon its a piece of crap stuck in there as above. Hydraulic lidters need oil pressure to work so if one gets blocked it don't lift properly..