Maybe a really stupid head gasket question

[Robliepse]

Changing the head gaskets on my 400 engine casting number 4006530-400-4 with heads 4006452 and the gasket that says it's for the 400 doesn't have all the cooling holes. What am I missing

 

[1778ppr]

You should be OK

I have the same heads. I just put steel head gaskets on my 400 and thought the same thing. They do not over heat and match the gaskets I removed. You should be OK.
Here's mine:

 

[Meep-Meep]

What you are seeing is typical. Put it together.

 

[gdrill]

I'm glad you guys posted these replies. Because when I got to my 440 and found these miniature passages in the gaskets, I probably would have gone back to the store and tried to find something with a larger opening myself.

 

[mopar 3 B]

Got a friend who opened the holes to match the 400 block. Would not stay cool after thermostat opened. Decide the restriction need to be there to hold coolant in radiator long enough to cool down.

 

[Seax440Dodge]

The restriction need to be there to hold coolant in radiator long enough to cool down.

this is what I was coming to say

 

[bm02tj]

that is like that so the water flows front to back in block and back to front in the heads so you do not get hot spots from no flow

 

[HT413]

that is like that so the water flows front to back in block and back to front in the heads so you do not get hot spots from no flow

This.

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Got a friend who opened the holes to match the 400 block. Would not stay cool after thermostat opened. Decide the restriction need to be there to hold coolant in radiator long enough to cool down.

This is not really how a heat exchange cycle works. It's a cycle so any time increase in the radiator is offset by time increase in the block, so heat exchange stays about the same.

 

[Robliepse]

thanks Guys!!! I'll continue wit the mission.

 

[miller]

Good to know. It would have stumped me, too.

 

[bm02tj]

This.

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This is not really how a heat exchange cycle works. It's a cycle so any time increase in the radiator is offset by time increase in the block, so heat exchange stays about the same.

It is the thermostat that controls flow in rad the water pump impeller controls flow in block and heads which has some diverted to rad when it gets to temperature

 

[nm9stheham]

Keep in mind that the large holes in blocks and heads have to be a certain minimum size to get out the casting sand from the sand cores. The gaksets have to be used to manage and direct the coolant flow.

Look at about minute 4 here for the casting sand coming out of the large block surface holes from the cast cooling passages:
https://www.youtube.com/watch?v=yXVLbzI3xTE

 

[HawkRod]

Keep in mind that the large holes in blocks and heads have to be a certain minimum size to get out the casting sand from the sand cores. The gaksets have to be used to manage and direct the coolant flow.

Look at about minute 4 here for the casting sand coming out of the large block surface holes from the cast cooling passages:

Very cool video - thanks for posting!