Lifter noise

[jabber353]

Hey guys. New to the forum. Looking for advise. I just put a very light cam in my 340 Cuda. Replaced cam, lifters, push rods & new rocker assemblies. Car runs great & sounds great until operating temp is reached. Lifters, rockers get very noisy. Car runs great but sounds like crap. Any help will be greatly appreciated. Thx.

[Rich G.]

What's your oil pressure after it gets hot?

[71-440]

 

There are a lot of knowledgeable people here who will be able to help diagnose your problem. 

[jabber353]

Oil pressure 55-60.

[Roadman]

First, welcome aboard.    Roller or flat tappet ? Hyd or solid ? Give us some more info on the motor.   

[jabber353]

30-45 at idle. Sounds like crap at stop light but runs great. ????

[jabber353]

Flat & hydraulic.

[jabber353]

Pretty much a stock 340 except for very light cam. I removed a heavier cam & wasn't making this noise. I'm gonna check the old pushrods & see if they are longer than the new ones.

[cudabob496]

look under valve cover to see if anything hitting

[Roadman]

@Chryco Psycho   Your thoughts   

[Jim AAR]

If your Oil pressure is lower than 45 Lbs at idle, that could be the cause, Oil Pressure should be between 45 & 65 Lbs at 1000 R.P.M.

Does the noise go away when you rev it to 1500 rpm and your oil pressure climbs?

I attached the Service Manual instructions for 340's about Tappet Noise. See attached PDF's

[HP_Cuda]

Could be a spring issue or possibly PTV issue.

[Lloyd Lind]

Well with a " big cam" you get valve springs to match. Could be your problem with the new smaller lift the springs are wrong. Check your cam card for the specs and then try and get them for Your old cam Or a problem with your push rod length as you said.

[Chryco Psycho]

Tough to diagnose from here !
First welcome to the site .
Pushrod length is my first thought , the cup in the lifter could be slightly lower so the lifter cannot adjust , do you know what brand of lifter was used , the Only good one left is Johnson , another though is are the rocker shafts on properly with the oil holes pointed down ?

[Cuda Cody]

Pushrod length was my first thought too.  Have you double checked to see if they are adjusted right?

What oil are you using?