I had the same problem and after 4 sets of lifters and 4 different length pushrods, its finally fixed. I finally ended up with 7.300" length pushrods in mine. I was having to much preload on the lifters. Comp Cams said I needed .001"-.002" preload. Now its just right. The longer pushrods were putting to much preload on the lifters. Its holding the pluger down to far for it to fill up with oil, and it was letting it run dry and that is what the tapping noise is.

 

what other 4sets of pushrods did you test?? I guess I need to call comp cam and ask..??

 

I started with 7.35" then With a new set of lifters I put 7.4". Got a little worse, so then I called Comp up and the guy told me to try 7.425", and that was really bad. So then I told myself, go the oppostie way that the guy told me and it worked, 7.300".

 

do you think the TR224 cam will have this problem using the 7.426" pushrods? This is what Comp Cam told me to use....

 

Its hard to say to you see how much preload you have. Just start with the stock length and go from there. See how much preload you have to figure out whether you need shorter or longer p/rods.

 

How do you check pre-load?

 

Find the base circle of your performance cam, measure the base circle of the stock cam you took out. Subtract the new cam measurement from the stock cam, divide this by half and that's how much longer your pushrods should be.

That's not perfect, but should put you close. Ideally you have to check the wear pattern on the valve tip. I usually paint mine with a sharpie, set my rocker adjustment nut, rotate the engine once or twice, then disassemble and check the pattern. it should wear evenly across the valve tip. if it's worn unevenly towards the intake then you need longer and vice versa.

Correct valvetrain geometry is critical to longevity and operation!

Everyone else is right...check the pushrods if they are open or not. Lifters might be shot.

Just some more fuel for the fire

 

UPDATE:

Cody and I retorqued the rockers and put some red tite or whatever its called on the bolts, turned on the truck and seems like the noise went away!!!
for now?? I'll give some feed back in the next couple of days....

 

Good for you bro.

I will be taking mine to the shop hpefully tomorrow. I am so frustrated!!!

 

should we use red loctite or blue loctite, i thought red was more permanent but it temp sensitive??? i dunno help me out