Block discs are designed to permanently lock your Limited slip differential (LSD) to 100%.
If you prefer the feeling of a welded differential over LSD, or you would like to try it, you install block disc set and you have it. Perhaps some drift layouts requires welded differential, so with this set, you can configure your diff to 100% lock all the time. Block discs are widely used on Dragster cars as well.
What are the advantages of Block discs over Welding the diff?
They are much morereliable. Unlike welded diff, they won't ever fail. You have aLifetime Warranty.
You canswitch backto LSD anytime. Just take the discs out.
Maintenance free. They don't require any special oil or service.
They give you the ability to have one and the same differential for street and drift days. You don't want to wear out your Limited slip differential on drift days, you can installBlock discs and take them out after the race day to switch back toLSDagain.