231 heads on a 225

I saw a blurp here some where that you can put 231 heads on a 225 with some modification could anyone give me a llink or pick on what is involved. found out that it is going to cost a freind of mine 200 to 300 bucks to have the 225 heads machines for new valve guides and 231 heads are plentiful in the local wrecking yards.

Thakyou to all that can help

 

Bolt up is not an issue. However, water passages/ports changed so many times over the years even Buick engineers lost track Take a 225 head gasket and lay it on a high-port 1979+ head to see how it will match up.

 

Sparky ...
I read that link that is why I am asking hoping someone had done that I dont quite understand what part of tha water jackets thay are refering to and if you have to have the heads replained ect ect.Basically if it is more work and money than just having the heads done I have.
Jon ...
thanks if worse comes to worse I will just get a set and run with it.

 

It's a big pain in the butt and runs into machine work. Much better off just rebuilding what he has instead of trying to fit something of unknown condition to that engine. Will probably cost much more in the long run to put the 231 used heads on the 225. Nickmil.

 

Hey thanks Guys for all the responses I think I am going to keep searching for cheaper machine shop to do the work and just have the heads we have refurbished.