Here is something to think about . Now I don’t want to burst your bubble and it could very well be that your timing has just been advance to far . But ,Do you have slap or don’t you ?. How long has this been happening ?
Retarding the timing can cosmetically cover up the problem .
if you have a wrist pin or rod bearing that’s worn , reducing the timing can make it sound better.
The reason for this is the closer you get to firing at TDC the more the bearings and rods become loaded and thus reducing the nock but it will still be there .
On older engine folks used to also go to a heavier viscosity oil as a fix as well . But in today’s engines with tighter tolerances ,this can cause the bearings to spin
Try this . Pull your dip stick and start the engine . Set the timing to factory specs
Now take the handle end of the dipstick and place it up against your ear..
Start with the cylinder the engine is timed to .
Place the pointed end at the top of the block just under the head by about 3 inches . You want to be about where the bottom of the piston would be at its furthest travel . To close to the head and your going to start hearing the valves working .
Listen for a thud . Thud , thud .sound . If its there you will here it through the dipstick . Check each cylinder that way.
Now start over but place the tip down below along where the crank sets in the block and again listen to each cylinder . Any damage to either the connecting rod bearing or wrist pin on any cylinder will be heard .
If the engine is timed correctly then every cylinder should have no noticeable change in the sound you hear.. If one has a louder noise then the others you know which cylinder you starting to have a problem on . You can actualy pin point the location of the problem using this method .
What im getting at is , this will help you decide if you fixed the problem or simply hid it for a while .
It will also help you diagnose the problem as to if its on the lower end or upper end .
As a side note , we used to fine tune out rocker settings this way on the old F heads . Even with the valve cover on you could hear specifically which valve had even the smallest clatter issues
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