6.2 Redblock Theory

[2INSANE]

Break the edges at a 45 degree angle...1/32" wide is all that's needed.
1/32" wide on the holes....Just touch the holes with a standard countersink in an electric drill

The idea is to get rid of the SHARP corners...
You can even do the head bolt holes in the block deck....Any bolt hole that has a sharp edge.

Just break the stress riser....

Will this solve all the ills...NOPE...But it will not hurt a thing.

If you use a 1/32" ball bur in your dumore and carefully remove the sharp root in the block cut where the main caps sit "L" This L is the cut....make it so the corner is slightly round...and run the roundness off the edges.....Do not modify the actual register...The cap must be tight....

A crack in this corner is not repairable

Oh thank you! Again sooo amazing of you to share your brain! I am loving it!

I can tell you have a soft spot for the Redblock 6.2. I do too and think a lot of others do as well. :-D

I have read somewhere, in some point of time that some machinists claimed that when they bored a 6.2 Red, they could hear the mill motor bog down a lot more then other 6.2 blocks. Like it was for sure a harder block then the others. I think this is where the nickel theory first started. Did you experience the same?

Edit: Just found this post about the 6.2 Red in the diesel place.

Mad (Sean) Max
Joined Jan 25, 2009 · 9,602 Posts
#15 · Sep 5, 2013

Jdemaris used to comment that whenever he touched an angle grinder to a red block that the sparks were a different colour than later castings which led him to believe that the '82 did contain a different metallurgy, most likely higher nickel. But again, not really proof. They are sought after though.


Just goes to show how others are assuming it has higher nickel content reinforcing the Redblock Theory…

There are hundreds of posts out there with assumptions but no solid proof…