I have a 396 with a new UD hydraulic roller with about 300 miles on it at about two hundred miles. I was driving home and heard a tick coming from the passenger side head, loud like when I broke th # 2 pushrod, after a couple seconds it went away. I heard nothing when I got home, so i took it out the next day and after a while it did it again and went away again. When I got home I thought I heard a very faint tick. So I posted here and decided to adjust the valves and did so using eoic and drove a couple days with no problem. During my lunch break the other day it came back big time and I got it back to work and shut it down. At the end of the day I started it hoping I could really listen and figure out wich of the rear 4 valves were ticking but it made no noise so I drove it home. I am pretty sure it is just going to need a new pair of roller lifters, the lifters were from the cam before it wich only had about 10,000 miles on it. I thought I better try to ask if there are any more ideas, also when adjusting with the EOIC way it felt a little slower shoud I try more than a 1/4 turn after zero lash or just stick with a 1/4

thank you

jacy ronhovde

Sounds like it's possible you have a lifter sticking in the bore. The cam lobe is slapping the roller and making the noise. That's my first thought anyway. I've seen it happen on our race motor. It made a real mess.

I would pull the intake and check the lifters to verify. If you let it go, you could break the lifter and ruin the cam as well.

I hope that's not what it is but it doesn't make sense to me that the lifter would be collapsing intermittently. Maybe someone else has other ideas.

Is you oil pressure staying at a good level? Do you have the correct springs for that CAM on your heads?

Troy.

Sounds like an exhaust leak.

Dwayne