06-27-2025, 09:01 PM
|
#7
|
Senior Member
Join Date: May 2015
Posts: 10,143
|
Re: 21A rods set up on a 4" Merc crank
Quote:
Originally Posted by Bored&Stroked
Also, if you can have the rods "shot peened" . . . that is a good process to stress-relieve and add some strength. You'll need to balance BOTH ends of the rods and make sure that you do NOT grind the strengthening rib off of the rod-cap.
You need to make a fixture for your lathe to cut the side-area of the rod caps to set the big-end weight. Ford NEVER ground the rib on the bottom and these rods do not have balance pads like modern rods.
Couple pics on my setup:
]
Here is what most shops will do . . . they grind the bottom cap rib! They don't know any better and weaken the cap:
]
Video on bearing sizing:
https://www.youtube.com/watch?v=CyVLsPdbhS8
|
...
|
|
|