Mild clattering from top end - problem or normal?
Thread Starter
Joined: Apr 2006
Posts: 3,889
Likes: 1,137
From: Grand Rapids, Michigan
Mild clattering from top end - problem or normal? I have a TR 224 cam, uncut heads, and 7.400" pushrods. I just installed a set of Patriot Gold springs and I'm noticing a bit of clattering from the valvetrain right above idle - either if I just blip the throttle and let it fall back down to idle, or if I hold it steady around 1300-1500 RPM. This happens primarily after my oil gets some heat in it. If I raise the RPM a bit more, it goes away. I'm just curious if it's just slack in my valvetrain because the lifters haven't fully pumped up, or if I need to pull it apart and check to see if the rockers have loosened up a bit.
Thread Starter
Joined: Apr 2006
Posts: 3,889
Likes: 1,137
From: Grand Rapids, Michigan
Yeah, it's more like a sewing machine sound. They're dual springs with about 30-35 pounds more seat pressure than what I had on there. I'm guessing that the additional seat pressure is overcoming the hydraulic pressure in the lifter at low RPM.
