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Old 10-03-2008, 01:06 PM
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plugging coolant holes in my block

I noticed that my AFR heads don't have a lot of coolant holes that my block has. I am going to be running copper head gaskets and I was thinking of tapping those coolant holes that don't go anywhere with a plug in the block. This way there will be a lot less places where there is a chance of coolant leaking. anybody ever heard of this?

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Old 10-03-2008, 01:12 PM
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I have not seen, or heard of it being done this way. I would think it would add some side 'pressure' to the surrounding port areas, possibly causing block surface distortions. JMO
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Old 10-03-2008, 02:13 PM
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I've plugged the large block coolant flow holes with pipe plugs & drilled the holes to the actual sizes in the heads for stiffening/strengthening of block. But this must be done before the block is decked and bored/honed.
As Carsavvycook said, You don't want to distort the block deck or cylinders.
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Old 10-03-2008, 09:14 PM
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You did not say what block. IF it is a sbc400, you have steam holes which need to be drilled in the heads.
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Old 10-04-2008, 09:26 AM
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Quote:
Originally Posted by 406 bug
You did not say what block. IF it is a sbc400, you have steam holes which need to be drilled in the heads.
This was my thought as well.

If you do have a 400 block, do NOT plug those holes in the block and do have the holes drilled in the heads. The holes that need to be drilled in the heads are at an angle. If you are not familiar with performing this; take them to a good auto machine shop.
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Old 10-04-2008, 09:48 AM
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its a 350 block and i was primarily concerned about the coolant holes that the block has that are eliminated in the cylinder heads. I feel that the less coolant holes the head gasket has helps it not leak as much coolant
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Old 10-04-2008, 09:52 AM
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400 Steam holes>
http://www.chevytech.com/2c42o2.html
Siamesed Cylinders on 400
http://www.chevytech.com/2c42o1.html
Drilling Steam Holes
http://www.gregsengine.com/350to400.htm
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Old 10-04-2008, 09:55 AM
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Darkostoj could you post some Pics of the Block & Head holes to see what holes are not in the heads?
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Old 10-04-2008, 10:02 AM
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Quote:
Originally Posted by darkostoj
its a 350 block and i was primarily concerned about the coolant holes that the block has that are eliminated in the cylinder heads. I feel that the less coolant holes the head gasket has helps it not leak as much coolant
I ran AFR heads on my Chevy 350 in the truck in my avatar. I don't recall any "extra" holes in the block that did not also show up in the heads.

As SSedan64 has asked, a photo or two might help.
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Old 10-04-2008, 10:10 AM
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these are the coolant holes in my block that the head doesn't have



here is a picture of my heads



and if I tap the block and have the plug below the surface of the block, why would I have to redeck the surface?
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Old 10-04-2008, 10:17 AM
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here is another pair of stockish heads that dont have the holes either



I'm curious why those coolant holes are even there if a lot of heads don't even have those passages? It seems like those passages are for cooling the spark plugs or something?
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Old 10-04-2008, 10:17 AM
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I see now. Those aren't there because the ARF has angled plugs that are also relocated closer to the exhaust valve or Combustion chamber center. Some would interfere with plug location. They shouldn't be a leak problem tho'.
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Old 10-04-2008, 10:18 AM
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Quote:
Originally Posted by SSedan64
I see now. Those aren't there because the ARF has angled plugs that are also relocated closer to the exhaust valve or Combustion chamber center. Some would interfere with plug location. They shouldn't be a leak problem tho'.
well it seems like copper head gaskets already have a bad problem with sealing coolant, and these 4 holes go to a hole in the gasket that doesnt even go anywhere so it seems like there would be some pressure buildup which would make it harder to seal the coolant. All i'm really thinking of is tapping those 4 holes with an NPT plug below the deck surface so coolant doesnt go to the head gasket surface anymore. I have never heard of anyone doing it and wanted to even see if anyone has ever heard of it before. I only have a few years into building motors as a hobby and I don't want to start "experimenting" on my own yet
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Old 10-04-2008, 10:20 AM
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Quote:
Originally Posted by SSedan64
I see now. Those aren't there because the ARF has angled plugs that are also relocated closer to the exhaust valve or Combustion chamber center. Some would interfere with plug location. They shouldn't be a leak problem tho'.
also my AFR's have straight plugs
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Old 10-04-2008, 10:24 AM
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Dark, why are you using copper gaskets? You could use some of the Cometic MLS gaskets. They'll custom make what ever you want.>
http://www.cometic.com/custom.aspx
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