226 cylinder head
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=79038
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Topic: 226 cylinder head
Posted By: The Other Orange
Subject: 226 cylinder head
Date Posted: 22 Oct 2013 at 4:18pm
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looking for some ideas on how to run water through the head only. I can only imagine id have to drill a new hole in the head and run a line back to the rad? Need some options maybe a pic or two would help.
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Replies:
Posted By: wi50
Date Posted: 22 Oct 2013 at 5:41pm
I've done it 2 ways.
1. Drilled 2 holes in the back and in the front ends half way up on the head and threaded them for 1/2" pipe. Plumbed the water in the back of the head and out the front back to radiator.
2. Fed water in the back and the front and out through 4 holes drilled directly above the exhaust runners.
These were on highly modified and partially filled cylinder heads. You most likely don't have that so simply feeding in each end and returning water to the radiator through a stock water manifold or plates on the water ports with nippels would be fine.
I plug the holes in the bottom of the head, the small holes get drilled for smaller pipe plugs and the large 2 get touched with an endmill and frost plugs. You can get hex driven pipe plugs with the countersunk hex in them so you can tap the threads in far enough and get the plugs recessed in the head deck.
I never ran any pressure and just a free flowing cooling system with a small alumnium radiator. I had tried the cheap 12 volt pumps but they never worked for long, when the impeller went bad the water just boiled out my filler neck in my top radiator line.
I took an electric small block Chevy water pump and drilled and tapped pipe threads in the ports on it where it would mate to the chevy block. This worked great and didn't cost me much for a pump on ebay or raceingjunk.com
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"see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet"
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Posted By: The Other Orange
Date Posted: 23 Oct 2013 at 1:36pm
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Thanks for the tips I have an idea now. What is considered a large bore 4.625?
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Posted By: XT in pa
Date Posted: 23 Oct 2013 at 5:12pm
That's what I'm goin with on my 17. I don't think it's the biggest you can go. But it's pretty big.
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190XT,D17and 7045
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