After full installation of the following, the noise is still there!
1. Replaced rocker arms (I had a second set)
2. Replaced rocker shafts with new ones.
3. Replaced water pump and added a larger diameter fan (has nothing to do with the sound)
4. Fixed a broken thermostat housing
5. Reset valve lash
So far, I bought new gaskets (fixed leaks), painted parts, and new rocker shafts. The rest are extra new parts I had laying around for emergencies.
I’m starting to think that I have a lifter that is not moving through the whole range of motion. Maybe a weak valve spring?
It sounds great at an idle when I can have the hood up. I’m tempted to zip tie my phone under the hood so I can record the sound!
Info added; I’m not hearing a misfire or feel like I’m losing power like expect from a stuck lifter or bad spring.
Last edited by ndkid275; 06/22/2026 4:29 AM. Reason: Added info
