Join Date: Nov 2000
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Re: 4.0 head water jacket ?\'s
The 4.0 head overlaps the 258 block where those holesa are. I am rebiulding a block right now, and plan on putting this 4.0 head on. I layed the head on the block and used a scribe to mark the bottom of the head to see how close the holes came to the edge. Some people claim that they don't overlap very much, thus don't need to plug the holes, the head gasket just seals it to the block. Mine, it is very close, to close not to plug those pesky things. And you need to use a 4.0 gasket because the diameter of the cylinder is larger on the 4.0 and if you use a 4.2 gasket the metal ring that is supposed to seal the sylinders would be on the inside of the diameter of the 4.0 head and wouldn't seal properly.
I don't know if this makes any sense, but I tried.