383 performance questions

[bluex]

it only rattles under power at an idle it seems fine

What fuel are you running? Sounds like spark knock to me. Up your octane or drop some timing till it goes away

 

[am92]

What fuel are you running? Sounds like spark knock to me. Up your octane or drop some timing till it goes away

Good call, thats probably it unless there is some major bottom end knocking going on

 

[the black pearl]

Backed timing off till knock quit found the chip was advancing timing to much. Diff chip on the way hoping that one will fix it

 

[MOBS]

Good deal there pearl, glad ya found it.

I prolly confused the hell outta greensmith