Hood insulation heat shield
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
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From: Maywood NJ
Hood insulation heat shield
Hello. I had just noticed that my 68 427 hood did not have a black hood heat shield like my 69 350 had. Is this something that is a necessity in reducing the heat on the top of the hood for paint and to keep it cooler ? I have seen other 68s and 69s with this black heat shield and i seem to be the only one that does not have one. Any information will be very much appreciated . Btw i have seen a few in some corvette parts magazines but they are just flat and does not have the underside louvers for the 427 hood. And u can also see my hood opened in my photo gallery. Thanks again for your help .
Racer
Joined: Nov 2014
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Likes: 129
Mike
Are you talking about the fiber insulation that was applied to some cars or something else?
If it is the fiber insulation, no 1968 Corvettes received it from the factory. It was used sporadically in 1969. Some cars got it, some didn't, doesn't seem to be much rhyme or reason why.
For 69 I'm not even sure the reason they used it was for heat insulation purposes. To me it looks as if they could have been trying to find better ways to force more air through the radiator to help with overheating problems or reduce fan noise.
Whatever the reason you don't have to have it, and for 68 shouldn't if your going for the factory look.
John
Are you talking about the fiber insulation that was applied to some cars or something else?
If it is the fiber insulation, no 1968 Corvettes received it from the factory. It was used sporadically in 1969. Some cars got it, some didn't, doesn't seem to be much rhyme or reason why.
For 69 I'm not even sure the reason they used it was for heat insulation purposes. To me it looks as if they could have been trying to find better ways to force more air through the radiator to help with overheating problems or reduce fan noise.
Whatever the reason you don't have to have it, and for 68 shouldn't if your going for the factory look.
John
Last edited by JC68; Mar 19, 2017 at 01:11 AM.
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
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From: Maywood NJ
Mike
Are you talking about the fiber insulation that was applied to some cars or something else?
If it is the fiber insulation, no 1968 Corvettes received it from the factory. It was used sporadically in 1969. Some cars got it, some didn't, doesn't seem to be much rhyme or reason why.
For 69 I'm not even sure the reason they used it was for heat insulation purposes. To me it looks as if they could have been trying to find better ways to force more air through the radiator to help with overheating problems or reduce fan noise.
Whatever the reason you don't have to have it, and for 68 shouldn't if your going for the factory look.
John
Are you talking about the fiber insulation that was applied to some cars or something else?
If it is the fiber insulation, no 1968 Corvettes received it from the factory. It was used sporadically in 1969. Some cars got it, some didn't, doesn't seem to be much rhyme or reason why.
For 69 I'm not even sure the reason they used it was for heat insulation purposes. To me it looks as if they could have been trying to find better ways to force more air through the radiator to help with overheating problems or reduce fan noise.
Whatever the reason you don't have to have it, and for 68 shouldn't if your going for the factory look.
John
Last edited by MikesRed68; Mar 19, 2017 at 02:54 AM.
Racer
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Mike
Looking at the Eckler website their picture does seem to show what looks like a closed cell foam in black. Tough to tell from one small picture. Not what I have observed used on 69s.
http://www.ecklerscorvette.com/corve...1969early.html
The factory insulation if used, was a fiber glass mat. Typically a tan/gray color. The Wilcox Corvette website has a picture of it.
https://willcoxcorvette.com/corvette...n-69-big-block
I think they over state the potential fire hazard to increase sales. I live in AZ and have driven my 68 in 100+ degree temperatures many times. It hasn't caught fire yet.
John
Looking at the Eckler website their picture does seem to show what looks like a closed cell foam in black. Tough to tell from one small picture. Not what I have observed used on 69s.
http://www.ecklerscorvette.com/corve...1969early.html
The factory insulation if used, was a fiber glass mat. Typically a tan/gray color. The Wilcox Corvette website has a picture of it.
https://willcoxcorvette.com/corvette...n-69-big-block
I think they over state the potential fire hazard to increase sales. I live in AZ and have driven my 68 in 100+ degree temperatures many times. It hasn't caught fire yet.
John
Team Owner
Joined: Sep 2006
Posts: 31,280
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From: Westminster Maryland
Hi,
I believe during 69, the insulation (when it was used) was held in place with 3 pins and 'push-on' retainers.
So I guess looking for remaining signs of those pins would be an indication of whether a particular car had the insulation or not.
Regards,
Alan
I believe during 69, the insulation (when it was used) was held in place with 3 pins and 'push-on' retainers.
So I guess looking for remaining signs of those pins would be an indication of whether a particular car had the insulation or not.
Regards,
Alan
Last edited by Alan 71; Mar 19, 2017 at 07:44 AM.
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
Likes: 12
From: Maywood NJ
Mike
Looking at the Eckler website their picture does seem to show what looks like a closed cell foam in black. Tough to tell from one small picture. Not what I have observed used on 69s.
http://www.ecklerscorvette.com/corve...1969early.html
The factory insulation if used, was a fiber glass mat. Typically a tan/gray color. The Wilcox Corvette website has a picture of it.
https://willcoxcorvette.com/corvette...n-69-big-block
I think they over state the potential fire hazard to increase sales. I live in AZ and have driven my 68 in 100+ degree temperatures many times. It hasn't caught fire yet.
John
Looking at the Eckler website their picture does seem to show what looks like a closed cell foam in black. Tough to tell from one small picture. Not what I have observed used on 69s.
http://www.ecklerscorvette.com/corve...1969early.html
The factory insulation if used, was a fiber glass mat. Typically a tan/gray color. The Wilcox Corvette website has a picture of it.
https://willcoxcorvette.com/corvette...n-69-big-block
I think they over state the potential fire hazard to increase sales. I live in AZ and have driven my 68 in 100+ degree temperatures many times. It hasn't caught fire yet.
John
... Also if u do look at 68s and 69s with the hood open u see what i am really talking about. I am not to worried anymore from what u wrote in your last post about living in AZ and driving in 100 degrees. But this is really driving me nuts as to what was on the underside of the hood.Would u happen to have a pic of your 68? Not just the hood but id love to see your 68 anyway as those were my all time fav c3s. Also John would u mind if we became friends on here. I really do appeciate u taking your time and looking into this for me . Mike 
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
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From: Maywood NJ
Hi Alan yes i do believe u are right about the pins and push on retainers. But it was not a like fiber soft insulation that i am referring to. This was a hard black something plastic thick that covered the whole underside of the hood.
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
Likes: 12
From: Maywood NJ
Hi John .The one from Willcox is definetly not the one that was on the 69. There is one that closely resembles the one that was on the 69 and it is for sale on the Corvette America catalog page 136. This is just driving me nuts... Also if u do look at 68s and 69s with the hood open u see what i am really talking about. I am not to worried anymore from what u wrote in your last post about living in AZ and driving in 100 degrees. But this is really driving me nuts as to what was on the underside of the hood.Would u happen to have a pic of your 68? Not just the hood but id love to see your 68 anyway as those were my all time fav c3s. Also John would u mind if we became friends on here. I really do appeciate u taking your time and looking into this for me . Mike
... Also if u do look at 68s and 69s with the hood open u see what i am really talking about. I am not to worried anymore from what u wrote in your last post about living in AZ and driving in 100 degrees. But this is really driving me nuts as to what was on the underside of the hood.Would u happen to have a pic of your 68? Not just the hood but id love to see your 68 anyway as those were my all time fav c3s. Also John would u mind if we became friends on here. I really do appeciate u taking your time and looking into this for me . Mike Corvette Stories
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Hello Mike,
My June of '68 BB did not have any insulation on the underside of the hood as John stated.
The underside should be blacked out similar to the engine compartment surround.
There is a rubber strip that accts as an insulator on my BB that is attached with staples to the top of the radiator support or shroud that's supposedly sealed this area between the hood and radiator.
The hood should be clear of any underside attachments.
They were making the 69's shortly thereafter in July/Aug. of 68 so I'd say no 68's had it as mine is a later build.
Hope this helps to support what John already said.
Marshal
My June of '68 BB did not have any insulation on the underside of the hood as John stated.
The underside should be blacked out similar to the engine compartment surround.
There is a rubber strip that accts as an insulator on my BB that is attached with staples to the top of the radiator support or shroud that's supposedly sealed this area between the hood and radiator.
The hood should be clear of any underside attachments.
They were making the 69's shortly thereafter in July/Aug. of 68 so I'd say no 68's had it as mine is a later build.
Hope this helps to support what John already said.
Marshal
Burning Brakes
Joined: Oct 2013
Posts: 1,114
Likes: 520
From: McClellandtown, Pa.
Hi Mike,
Checking the 68-69 Judging Manual it states that in 69 , there was a piece of dark gray/ black insulation padding fixed to the front underside of the hood. It was used sporadically, with no particular rhyme or reason. But most appeared on 427 cars. There was three aluminum split shaft pins (attached to the underside of the hood, as Alan mentions.) Round black flat metal push on retainers held it place.
Now, as far as on the 68, there was a small piece of insulation glued to the hood in the same location BUT, it was only used on L88 and ZL1 cars.
Here are a couple photos from the "Dobbins 68-72 Fact Book".
Hope this helps,
Tooch
Checking the 68-69 Judging Manual it states that in 69 , there was a piece of dark gray/ black insulation padding fixed to the front underside of the hood. It was used sporadically, with no particular rhyme or reason. But most appeared on 427 cars. There was three aluminum split shaft pins (attached to the underside of the hood, as Alan mentions.) Round black flat metal push on retainers held it place.
Now, as far as on the 68, there was a small piece of insulation glued to the hood in the same location BUT, it was only used on L88 and ZL1 cars.
Here are a couple photos from the "Dobbins 68-72 Fact Book".
Hope this helps,
Tooch
Last edited by Tooch1; Mar 19, 2017 at 08:24 AM.
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
Likes: 12
From: Maywood NJ
Hello Mike,
My June of '68 BB did not have any insulation on the underside of the hood as John stated.
The underside should be blacked out similar to the engine compartment surround.
There is a rubber strip that accts as an insulator on my BB that is attached with staples to the top of the radiator support or shroud that's supposedly sealed this area between the hood and radiator.
The hood should be clear of any underside attachments.
They were making the 69's shortly thereafter in July/Aug. of 68 so I'd say no 68's had it as mine is a later build.
Hope this helps to support what John already said.
Marshal
My June of '68 BB did not have any insulation on the underside of the hood as John stated.
The underside should be blacked out similar to the engine compartment surround.
There is a rubber strip that accts as an insulator on my BB that is attached with staples to the top of the radiator support or shroud that's supposedly sealed this area between the hood and radiator.
The hood should be clear of any underside attachments.
They were making the 69's shortly thereafter in July/Aug. of 68 so I'd say no 68's had it as mine is a later build.
Hope this helps to support what John already said.
Marshal
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
Likes: 12
From: Maywood NJ
Hi Mike,
Checking the 68-69 Judging Manual it states that in 69 , there was a piece of dark gray/ black insulation padding fixed to the front underside of the hood. It was used sporadically, with no particular rhyme or reason. But most appeared on 427 cars. There was three aluminum split shaft pins (attached to the underside of the hood, as Alan mentions.) Round black flat metal push on retainers held it place.
Now, as far as on the 68, there was a small piece of insulation glued to the hood in the same location BUT, it was only used on L88 and ZL1 cars.
Here are a couple photos from the "Dobbins 68-72 Fact Book".
Hope this helps,
Tooch
Checking the 68-69 Judging Manual it states that in 69 , there was a piece of dark gray/ black insulation padding fixed to the front underside of the hood. It was used sporadically, with no particular rhyme or reason. But most appeared on 427 cars. There was three aluminum split shaft pins (attached to the underside of the hood, as Alan mentions.) Round black flat metal push on retainers held it place.
Now, as far as on the 68, there was a small piece of insulation glued to the hood in the same location BUT, it was only used on L88 and ZL1 cars.
Here are a couple photos from the "Dobbins 68-72 Fact Book".
Hope this helps,
Tooch
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Hello Mike,
It's my understanding the hoods underside was blacked out same as other underside components.
If your car was repainted its very common to remove the hood during a respray. It is possible the painter shot both sides. I do not remember seeing any 68's at any of the shows I've attended having a paint to match underside on the hood.
A Krylon rattle can of 1614 black can correct that.
Marshal
It's my understanding the hoods underside was blacked out same as other underside components.
If your car was repainted its very common to remove the hood during a respray. It is possible the painter shot both sides. I do not remember seeing any 68's at any of the shows I've attended having a paint to match underside on the hood.
A Krylon rattle can of 1614 black can correct that.
Marshal
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
Likes: 12
From: Maywood NJ
Hello Mike,
It's my understanding the hoods underside was blacked out same as other underside components.
If your car was repainted its very common to remove the hood during a respray. It is possible the painter shot both sides. I do not remember seeing any 68's at any of the shows I've attended having a paint to match underside on the hood.
A Krylon rattle can of 1614 black can correct that.
Marshal
It's my understanding the hoods underside was blacked out same as other underside components.
If your car was repainted its very common to remove the hood during a respray. It is possible the painter shot both sides. I do not remember seeing any 68's at any of the shows I've attended having a paint to match underside on the hood.
A Krylon rattle can of 1614 black can correct that.
Marshal
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
Likes: 12
From: Maywood NJ
Marshall..Can i send u my picture of my 69 hood with it open to show u what i am talking about .To me it is not just black paint ..I have pics on my cell phone i want to send u.. This is really frustrating me to no end . lol...omg ....text me ok? 551 255 7346 and ill send u 2 pics now. ...Im sure u will know and put an end to this if it is paint or not...
Race Director
Joined: Oct 2000
Posts: 12,682
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From: Shamong, NJ
As mentioned above, some 69 Corvettes had a small fiber type hood insulation pad, that covered maybe the first 20% of the hood. It was on 69's only, not 68's, or 70-72's.
I wouldn't worry about adding insulation to your hood. You are never going to have enough heat build up under your hood, to do damage to the paint, or the hood itself.
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
Likes: 12
From: Maywood NJ
Are you referring to the "AcoustiSHIELD hood insulation Kits" that are on page 136? If so, they are aftermarket parts, that were NEVER installed on any Corvette by GM. There was also never anything in the way of a plastic shield, used on the underside of 69 Corvette hoods. Whatever was on the hood of your 69, it was put there by a previous owner, not Chevrolet.
As mentioned above, some 69 Corvettes had a small fiber type hood insulation pad, that covered maybe the first 20% of the hood. It was on 69's only, not 68's, or 70-72's.
I wouldn't worry about adding insulation to your hood. You are never going to have enough heat build up under your hood, to do damage to the paint, or the hood itself.
As mentioned above, some 69 Corvettes had a small fiber type hood insulation pad, that covered maybe the first 20% of the hood. It was on 69's only, not 68's, or 70-72's.
I wouldn't worry about adding insulation to your hood. You are never going to have enough heat build up under your hood, to do damage to the paint, or the hood itself.
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Mike,
Sorry I'm at work in my police Tahoe now.
Unable to snap a pic at the moment.
Go and look at the cars on the forum in the general section under cars by color.
You will see all 68's had a blacked out under belly on the hoods.
They also blacked out the surrounds under the head lamp assy and the wheel wells.
Hope this clears it up. Your over thinking this.
Marshal
Sorry I'm at work in my police Tahoe now.
Unable to snap a pic at the moment.
Go and look at the cars on the forum in the general section under cars by color.
You will see all 68's had a blacked out under belly on the hoods.
They also blacked out the surrounds under the head lamp assy and the wheel wells.
Hope this clears it up. Your over thinking this.
Marshal
Thread Starter
Racer
Joined: Feb 2017
Posts: 407
Likes: 12
From: Maywood NJ
Mike,
Sorry I'm at work in my police Tahoe now.
Unable to snap a pic at the moment.
Go and look at the cars on the forum in the general section under cars by color.
You will see all 68's had a blacked out under belly on the hoods.
They also blacked out the surrounds under the head lamp assy and the wheel wells.
Hope this clears it up. Your over thinking this.
Marshal
Sorry I'm at work in my police Tahoe now.
Unable to snap a pic at the moment.
Go and look at the cars on the forum in the general section under cars by color.
You will see all 68's had a blacked out under belly on the hoods.
They also blacked out the surrounds under the head lamp assy and the wheel wells.
Hope this clears it up. Your over thinking this.
Marshal