Modifying 12 valve head gasket for 24 valve

[rockjeep73]

What modifications need to be done to a 12 valve head gasket to use it on a 24 valve. I know there are companies that sell the modified gaskets but I see no reason to pay someone for something that I can do myself. Plus I have a couple of new 12 valve gaskets here.

 

[Bponci]

There are some water ports to modify. Align the 12 to the 24 and you will see the difference.

 

[Jetpilot]

The best way to do this is to take both gaskets to a good metal shop that has the proper tools and have them punch the 12v gasket out to fit the 24v. Some I have known have just drilled out the holes but this has lead to some issues later on.

The initial piece is going to cost the most. Basically when I had the program setup I would have been selling them at a loss. By doing 25 at a time the cost could be brought down though. So to do 1 piece will probably cost you more than just buying a finished product.

Doug

 

[rockjeep73]

Some I have known have just drilled out the holes but this has lead to some issues later on.

Sealing issues, of water and oil?

I guess I need to try and find my old 24 valve gasket and compare it to the 12 valver, it will probably make more sense to me if I see it.

 

[Mwyant 00]

When I did mine i just laid the 12v on top of the 24v and drilled it. When ur done make sure that there aren't any lose pieces of silicone. I had a little piece of silicone fall down in the motor and clog a oil squirt, piston got hot scored cylinder wall, then had to rebuild the motor.

 

[RonA]

I have a hand punch set that may work for that. It would be better than drilling.

Ron