Milling radius grooves

Do you have a pic of the head. Showing where the top radius cut goes ?
 
I mean the part that will mate with the radius. It’s easy to find the center of the bore .
But how do you find the center of the mating part . So both top and bottom mate.
 
Jimsehr said:
With a bore head it will be hard to set dia of radius. I would take a 5 inch disk of stock about 1/2 inch thick and center it on mill. Then drill and bore a 3/4 bore on center then move off center half of radius dia and then drill and bore or ream dia of needed radius. Then use a 3/4 piece of stock inserted into disk as a shank to hold in collet in mill. Then insert a round piece of carbide into disk. You would have to grind
Needed radius on end of carbide.

View attachment 300892
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Thanks jimsehr, I agree, that would be more desirable than a boring head. I'll give it a shot

My comp engine has a fire ringed head and block, but the black has been decked since and lost about .006 of groove depth. As far as locating the grooves, I have the block and head in front of me to pick up the dimensions from. I also have the junk head I spoke about, which I have no problem using as a test mule. I would like to purchase, or build my own tooling to use to cut these receiver grooves deeper on the existing head, and possibly a back up head.

This is more of a project I want to figure out how to do, rather than a project I must do, as I could use a thicker headgasket, and my existing head grooves would fall into spec. It's a project I'm interested in performing as I'm an average Joe with a very expensive hobby and would like to learn how to do as much of my own work as possible.
 
Oops, the head has been decked since. Not the block. Grooves on the head are lacking about .006 for STD thickness HG
 
If you post a pic of both mating parts I think I could come up with a simple way to line up both the top and bottom radi.
Might not be as good or fast as a production one. But one that would work for a home shop.
Pic should be as big as you can get.
Jimsehr
 
Don’t need whole head , just around where the radius goes.
 
Jasteven said:
Having trouble posting pics... File too large
Click to expand...
The easiest way i found to solve this issue if you dont have a resizing app on a smartphone is to simply open the picture on your phone and take a "Screen Shot" of the picture in question and then post the screen shot duplicate. The default setting on my screen shot is small enough to post here without a problem without messing with my camera's settings.
 
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