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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> 67 327 intake heat shield. Can it be removed?
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cdnpont


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67 327 intake heat shield. Can it be removed?
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Cleaning my 327 cast iron intake. I'd like to take the heat shield on the bottom off. I think to clean it properly it needs to come off.

Can it be removed...then put back on? How is it even fastened? I haven't tried prying at it yet for fear of damaging it.

39653828513_a8d4f154ba.jpg



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GLHS60


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Its fastened with 4 removable rivets.

I use a chisel and hammer to remove them, not chop them off but gently pry them up.

The rivet shafts have little ernts on them so when reinstalled in a different position they hold tight.

Thanks
Randy



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cdnpont


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Thanks Randy. I'll get to it.



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 
norontcan


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Believe it is held in place by a special rivet type, the name of which escapes me.
The head you can see. The shaft is most probably about 1/2" to 3/4" long and looks like it has chisel marks punched into it. Giving it an appearance somewhat like an ardox nail. When tapped into the softer metal of the intake the chisel marks grab and hold.
Once you remove the existing ones by grabbing them with vice grips you should be able to find new ones at a good specialty faster store such as Rastall.
Hope this helps

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GLHS60


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Take your time and you will be surprised how easy they come out.

Let us know how much crap is under the shield, there is normally a significant amount.

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Randy

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CDN2PLS2


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I also put a dab of loctite and hammer home.

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cdnpont


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I guess it wouldn't be good to have the rivets come free! 

What exactly is the purpose of the shield?



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Bill shuba


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I thought with a lot of fooling around with brushes and solvent I got mine pretty clean..found out that it can and should be removed and was shocked by the stuff I had missed..glad I did it..really easy to do

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GLHS60


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cdnpont wrote:

I guess it wouldn't be good to have the rivets come free! 

What exactly is the purpose of the shield?

It's to help keep oil splash off the bottom of the intake manifold heat crossover passage.

Oil that gets excessively heated turns into a nasty coke like substance that Bill mentioned above.

 

Thanks

Randy



-- Edited by GLHS60 on Saturday 5th of January 2019 04:57:56 PM

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cdnpont


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Sweet Jesus!...

45706186675_0637c58942_z.jpg31679407037_dc1e871d9b_z.jpg

I can imagine how much good that coke would do dropping down into the lifter galley.



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CdnGMfan


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I believe the correct term for the shield is "Valley Cover".



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cdnpont wrote:

45706186675_0637c58942_z.jpg31679407037_dc1e871d9b_z.jpg

I can imagine how much good that coke would do dropping down into the lifter galley.




I guess I better pull the cover off my big block intake before I install it. I've never taken one off before.

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cdnpont


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Good idea Carl.

I guess that exhaust passage in the intake gets a little hot, like exhaust manifold hot? 

Is that coke pile a reflection of old oil technology in that it burns at a lower temperature?



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4SPEED427


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I'm wondering if it has more to do with the fact that it's dirty contaminated oil so there's material in the oil that burns dirty like that.

I wonder, if it was strictly clean oil in the engine all the time, would it look like that under the cover? I bet it wouldn't.

Those rivets come out fairly easy Mark?

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GLHS60


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Carl Stevenson wrote:
cdnpont wrote:

 

 

45706186675_0637c58942_z.jpg31679407037_dc1e871d9b_z.jpg

I can imagine how much good that coke would do dropping down into the lifter galley.


 



I guess I better pull the cover off my big block intake before I install it. I've never taken one off before.

MK IV's don't have a removable heat shield!!

Thanks

Randy

 

 



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4SPEED427


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I just checked my intake and you are absolutely right Randy, I'd have a heck of a time removing a non existent part!



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4SPEED427


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Yet another reason to do big blocks rather than small blocks!

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GLHS60


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GM used to sell one part # 3931093 and the aftermarket probably does as well.

Thanks
Randy


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66 327 sd


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I had the same mess to deal with when I found a replacement manifold for my quadrajet a few years back.

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Pontiacanada


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I did mine. Found about the same amount of crud. I drilled mine out (prying didn't work). I also have a bunch of new replacement rivets if you need them.

While I was at it, I also cleaned out the runners/bore, and knocked back any outside/inside cast metal flashing.

IMG_1269.JPG

IMG_1270.JPG

IMG_1420.JPG

 



-- Edited by Pontiacanada on Sunday 6th of January 2019 07:23:00 AM

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cdnpont


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That thing is a work of art Darryl. Nice.

Thanks for the rivet offer. I'm thinking I might just drill and tap the rivet holes for a small machine screw. Put them in with red locktite.



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seventy2plus2


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GLHS60 wrote:
Carl Stevenson wrote:
cdnpont wrote:

 

I can imagine how much good that coke would do dropping down into the lifter galley.


 

I guess I better pull the cover off my big block intake before I install it. I've never taken one off before.

MK IV's don't have a removable heat shield!!

Thanks

Randy

 

 

 My 1970 cast iron big block intake has a removable heat shield.  



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GLHS60


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I should have been more specific, the factory high rise didn't have the removable heat shield where ihe low rise did.

I've removed the shields on many intakes for cleaning and never broke a rivet, what's up with you rivet busters!!

Thanks
Randy



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