motor noise -1979 -350 small block

[krh]

I have a 350 small block, we just put summitt heads, guilde plates, slightly overstock cam, new lifters,1.6 rockers, after it was finished the motor runs and starts great - no problems, but at crusing speed I get a chiming sound coming for the motor. At idle no noise. I can reve the motor and it makes the same chining sound. One mechanic told me it was air in the lifters? Another said it may be coil bind? What and I hearing? Any comments and repair tips. I do not want to drive
it if it may cause any damage to the motor, but it does not seem to affect preforamce, just the noise? The mechanic is on vacaation for a week. Please help

krh

 

[zachh]

Exhaust leak? Not enough air at idle to make the sound. I think air in the lifters would make a clicking sound.
Thats my guess
zachh

 

[waterboy1976]

Did you check for coil bind when you installed the springs? What springs? cam? lift? lift with 1:6 rockers?

 

[Curtis]

Rocker arms hitting the valve covers?

 

[waterboy1976]

Good call Curtis!!!! I forgot about that one....I had to use thicker gaskets on my covers cause the rockers (1:6 Rollers) were tapping the cover.....

 

[Bill75]

Rocker arms hitting the valve covers?

I had the same problem, used a Dremel tool to grind a little relief where they were hitting.

 

[zachh]

What about the timing chain and gears? Too tight? thats metal hittin metal, that could make a chime. Are you sure its coming from the lifter/ head area?
zachh

 

[krh]

Zachh, thanks for the reply, I do not think that the noise is coming from the timing chain or gears. It sounds like it is coming from the fire wall down?
Could it be the alt,. I did the old trick listening through a stick and I rules out lifters and values. The noise is simular to a belt, but is coming from further back It is a 350 trans and the noise is sitting still in park and running. Everything has been rebuilt but the trans.
Thanks in advance
krh.

 

[wishuwerehere82]

Maybe the starter bendix gear isn't completely disengaging the flywheel?
Or the inspection plate might be loose?
Could be the torque converter input shaft seal squeeling?
Maybe the front pump on the TH350?
Maybe a vaccuum leak somewhere around the brake booster?