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post #1 of (permalink) Old 04-16-2002, 06:34 PM Thread Starter
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4.0 head water jacket ?\'s

Ok here is a question that I haven't heard anyone ask before about the 4.0 head to 4.2 block swap. After I fill my 12 water jackets on my 4.0 head shut, how does the water circulate through the head? Does the head get hot, or does enough water go in that it doesn't need to circulate? Or does it circulate out of the other remaining water jackets? Would it be adventagous to drill a small hole in the center of the filled jackets to allow it to go down into the block?
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post #2 of (permalink) Old 04-16-2002, 09:12 PM
 
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Re: 4.0 head water jacket ?\'s

There are no corresponding holes in the 4.0 or 4.2 blocks or their head gaskets for the twelve triangular holes you block.
No problem.
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post #3 of (permalink) Old 04-17-2002, 05:29 PM
 
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Re: 4.0 head water jacket ?\'s

If there are no holes to line up on the blocks or head gaskets then why are the holes filled? I'm not being a wise a** it's just that I have this to do this weekend and didn't want to go to the trouble if not necessary. BTW, which head gasket do I use, the 4.0 or the 4.2
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post #4 of (permalink) Old 04-17-2002, 05:55 PM Thread Starter
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Re: 4.0 head water jacket ?\'s

I believe that it is due to the overlap of the 4.0 head on the 4.2 block. The block is skinnier than the head. You also want to use the 4.0 gasket.
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post #5 of (permalink) Old 04-17-2002, 06:39 PM
 
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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.
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post #6 of (permalink) Old 04-17-2002, 06:54 PM
 
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Re: 4.0 head water jacket ?\'s

Thanks for the info guys, that's what I needed to know.
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