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  #1  
Old 09-29-2018, 11:48 PM
johnsonic johnsonic is offline
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What are the rods in heads?

Just knocked the plugs out of my heads and am wondering what the metal rods behind them that are somewhat freestanding that run the length of the head are and what they do.

On one head they are not attached to anything, on the other it seems like they are connected on one side.
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Last edited by johnsonic : 09-30-2018 at 12:09 AM.
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  #2  
Old 09-30-2018, 12:45 PM
johnsonic johnsonic is offline
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Here's a photo if it helps - see those two rods behind the plug hole?

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  #3  
Old 09-30-2018, 01:16 PM
wiley-moeracing wiley-moeracing is offline
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don't worry, there for casting when the head is poured. If they are loose, pull them out, if not just leave them in.
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  #4  
Old 10-01-2018, 01:22 AM
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FSJunkie FSJunkie is offline
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They held the sand casting cores together when the heads were cast. The sand was broken up and flushed out after the casting cooled but the rods remained. AMC didn't bother to remove them since they don't cause any harm.
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  #5  
Old 10-01-2018, 08:22 AM
johnsonic johnsonic is offline
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Learn something new every day - thanks guys!
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MSD 8523
Dakota Digital custom cluster
Serehill headlamp harness
NWMP aux tank

1987 GW deceased
...but the parts live on
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  #6  
Old 10-11-2018, 09:28 AM
rocklaurence rocklaurence is offline
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Quote:
Originally Posted by johnsonic
Learn something new every day - thanks guys!

Wow! me too
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  #7  
Old 10-13-2018, 06:50 AM
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blazer3664 blazer3664 is offline
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Hmm, guess I make #3. Never knew that.
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  #8  
Old 10-14-2018, 02:04 AM
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FSJunkie FSJunkie is offline
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The sixes have the rods in their heads too. I thought it was a coat hanger that someone twisted up and shoved into my cylinder head the first time I saw one. That thought evolved into thinking it was a sort of sacrificial anode installed by the factory to prevent corrosion. Then I read on the AMC forum that they are just rods used to hold the casting sand cores together. They break up the cores with a vibratory shaker so the sand breaks up and falls out but the rods remain.

I thought the idea of someone shoving a coat hanger in my cylinder head was far more entertaining.
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  #9  
Old 11-03-2018, 07:07 PM
johnsonic johnsonic is offline
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If anyone's curious what they look like:

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Serehill headlamp harness
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