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  #1  
Old 07-05-2003, 08:56 PM
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19cuda67 19cuda67 is offline
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Default 383 block ,906 head question

There are water passages in the block and heads, 1/2 holes, that are between the cylinders.Question aren't these passages suppose to align, I,m having overheating problems at idle and the way things are now there is no way there could be any flow between combustion chambers in the head with the way this is set up now,1964 383 block ,?906 heads. I believe I have tried everything else.
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Old 07-05-2003, 09:19 PM
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Default 383/906

The holes in wich you speak of are not your trouble.
To the best of my knowlage these holes never were ment
to be full flowing
The older blocks did have a differant shaped hole then the later modle blocks.
However If you look at a head gasket you will see there is only a small sraight slot that the water passes though between the holes you mentioned.
This design does not require the holes to be alinged as you might think.
Look at a used head gasket in the area of these holes on both sides and you will better understand what I mean.
Hope it helps
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  #3  
Old 07-05-2003, 09:48 PM
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Dan is there suppose to be any flow through these passages at all,because there is no way there coulc be the way it is now.
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Old 07-06-2003, 06:01 AM
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Even if there is no water flow into the heads, that won't cause you to get a hot reading at the water pump (where the sending unit is). The water would simply bypass the heads and go back through the block. This could cause extreme cylinder head temperatures, but not where your reading is coming from. Keep looking at the simple things. Are the cores clear on your radiator? Do you have an adequate radiator? Is your fan clutch (if you have one) working? Do you have a fan shroud? What does the thermostat look like? Does it operate properly? Is coolant moving through the engine? Look hard, look long, and I bet you will find an alterior problem. Good luck chasing it down.
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Old 07-06-2003, 12:24 PM
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jasontlit jasontlit is offline
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Was the block fully cleaned on the engine's last rebuild/freshening?

I found a 340 in a junkyard once and before installing it I removed all the freeze plugs and hosed out the water jacket. I couldn't believe the pile of crap that came spewing out of the poor thing!

It did run right a 195 degrees in all types of weather and traffic without any overheating though.
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  #6  
Old 07-06-2003, 07:27 PM
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Another thing to remember is that even hot tanking the block wont get all of the rust, scaling and crud out of the passages. They have to be acid flushed to get all of the crud out.
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Old 07-06-2003, 10:14 PM
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There was a thread a fwe weeks back (The Cure)? that explained about this head to block situation. It was very easy to understand. Try to find it and do as it says. Good luck.............djs
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Old 07-06-2003, 11:46 PM
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Quote:
Originally posted by jasontlit
Was the block fully cleaned on the engine's last rebuild/freshening?

I found a 340 in a junkyard once and before installing it I removed all the freeze plugs and hosed out the water jacket. I couldn't believe the pile of crap that came spewing out of the poor thing!

It did run right a 195 degrees in all types of weather and traffic without any overheating though.
Good point--forgot that one.
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  #9  
Old 07-07-2003, 11:14 PM
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Saw somewhere that some head gaskets suggest that you drill 1/8 steam holes into the block at selected areas that coincide with the head and head gasket holes. That was a long time ago that I saw that, and I think it was on a 351C head gasket. It may work on other motors. Ill check the Felpro web site and see if I cant find anything
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