09-07-2011, 08:24 PM
|
 |
Senior Club Cobra Member
|
|
|
Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
|
|
Not Ranked
Hi Chris, I use 1.5 times the thread diameter as a general rule. That would be 1-1/8" in this case. I assume your talking rear upper outer? They have most of the load radially on them and it's compressive so not a big concern.
|