Cylinder head identification

[Johnny]

I was given an engine a while ago said to be a later R4 Cleon 1108 cc. After removing the cylinder head, I started to check it over. I noticed that just below each pair of inlet ports, there were M4 threaded drillings. When I injected some water into one drilling, it flowed out of the water pump location. The other side was blocked. When I put a 28mm inlet manifold on the studs, the holes were just visible below it.

Can anyone tell me what these holes were for please, assuming of course, it is indeed a R4 head? I have attached a couple of photos.






Thanks

 

[mr-reno-139]

no idea I've been exclusive on old Renault for 40 years and can't think of any reason for mysterious holes
maybe they were for location dowel pins for a custom performance manifold to make sure alignment correct
I would screw in with loctite and cut flush
more pics of head from all sides and maybe Google any casting part numbers
770 *******
several renault heads look very similar across range but cast differently for water pump at different ends

 

[Johnny]

Thanks Paul. It may well be that they were for locating purposes and that the drill through to the water channel was an error....particularly since one seems blocked!