Hood Insulation Ideas? What Do You Use?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mapearso · 03-29-2015, 12:58 AM

I would like to install some hood insulation

The aftermarket suppliers prices I've seen are pretty outrageous -- like $175 plus oversize shipping

What are you guys using for underhood insulation?

Thanks!!

**special-K** · 03-29-2015, 09:46 AM

Factory spec.

Lou Boffa · 03-29-2015, 03:46 PM

Lowes foil insulation and 3M spray adhesive.

Mapearso · 03-29-2015, 08:40 PM

Quote:

Originally Posted by Lou Boffa

Lowes foil insulation and 3M spray adhesive.

Is that duct insulation? I think it's called Frost King?

If so... I've used it on the inside of the cab instead of Dynomat

BruthaMan · 03-29-2015, 08:47 PM

I have to ask...what is the advantage to insulating the underside of the hood? I can appreciate cab insulation, but would like to learn the benefit of doing the underside of the hood.

Jim70Chevy · 11-07-2016, 08:54 PM

Lou, If you don't mind telling me where did you get the Chevrolet radiator support covers?

They look great.

Quote:

Originally Posted by Lou Boffa

Lowes foil insulation and 3M spray adhesive.

Andy4639 · 11-07-2016, 09:20 PM

BruthaMan,
I've never figured out why you want to hold the heat under the hood either. I have always wanted the heat to get out instead of keeping it in.

crakarjax · 11-07-2016, 09:26 PM

The insulation can help the engine warm up faster, acts as a fire suppressant if it falls down (on newer cars, not sure about these), and muffles engine noise.

On the other hand it also decreases engine cooling.

LongBox · 11-07-2016, 09:28 PM

Some cars have insulation to absorb the noise. Maybe keeping the paint cool will help it look good for a longer period of time?

My stock 69 doesn't have any insulation under the hood. It's a base model.

I happen to like the sound of the engine, so I have no plans to put any sort of insulation under the hood.

cleszkie · 11-07-2016, 10:03 PM

It looks custom when you raise the hood. I'll admit that I added insulation under mine, but its mostly to lower the heat on my fiberglass hood.

**special-K** · 11-08-2016, 08:34 AM

I see no point, other than protect fiberglass. The sun is the only heat that is hard on hood paint. never had a problem getting an engine to warm up on it's own. The heat comes from within that warms the mass. That's what a thermostat is for. The insulation would only hold heat in that had been created by the engine you wanted to warm up. The ambient temp is created by the object you want to warm up? The ambient temp is created by the warmed up engine. I don't see insulation making the engine too hot, though. The only issue I'd be concerned about is condensation created between hood and insulation being trapped

Lou Boffa · 11-08-2016, 09:15 AM

Quote:

Originally Posted by Jim70Chevy

Lou, If you don't mind telling me where did you get the Chevrolet radiator support covers?

They look great.

Jim, that's good old LMC. Part # 38-7819 I believe. Its a good product and has held up well. I know LMC gets a bad rap sometimes, but this part has worked nicely.

GASoline71 · 11-08-2016, 11:28 AM

Quote:

Originally Posted by special-K

Factory spec.

Yup... just the little rubber vibration isolators between the hood skin and the braces. No need for anything else.

Gary

Jim70Chevy · 11-08-2016, 01:00 PM

Thanks Lou! It is now on the list to buy. Jim

03-29-2015, 12:58 AM	#1
Mapearso Registered User Join Date: Oct 2008 Location: los angeles, ca Posts: 926	Hood Insulation Ideas? What Do You Use?? I would like to install some hood insulation The aftermarket suppliers prices I've seen are pretty outrageous -- like $175 plus oversize shipping What are you guys using for underhood insulation? Thanks!!

03-29-2015, 09:46 AM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Hood Insulation Ideas? What Do You Use?? Factory spec. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

03-29-2015, 03:46 PM	#3
Lou Boffa Registered User Join Date: Jan 2013 Location: San Antonio, TX Posts: 733	Re: Hood Insulation Ideas? What Do You Use?? Lowes foil insulation and 3M spray adhesive. Attached Images __________________ Figure out what you want--then figure out what you are willing to give up to get it.

03-29-2015, 08:47 PM	#5
BruthaMan US Army Veteran Join Date: Nov 2008 Location: Central Texas Posts: 1,049	Re: Hood Insulation Ideas? What Do You Use?? I have to ask...what is the advantage to insulating the underside of the hood? I can appreciate cab insulation, but would like to learn the benefit of doing the underside of the hood. __________________ 1972 C10 Highlander - The making of a daily driver

11-07-2016, 09:20 PM	#7
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Hood Insulation Ideas? What Do You Use?? BruthaMan, I've never figured out why you want to hold the heat under the hood either. I have always wanted the heat to get out instead of keeping it in. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

11-07-2016, 09:26 PM	#8
crakarjax Registered User Join Date: Dec 2009 Location: Kirkland, WA Posts: 1,302	Re: Hood Insulation Ideas? What Do You Use?? The insulation can help the engine warm up faster, acts as a fire suppressant if it falls down (on newer cars, not sure about these), and muffles engine noise. On the other hand it also decreases engine cooling. __________________ 1968 LWB C20 / AC / Wood Bed

11-07-2016, 09:28 PM	#9
LongBox Registered User Join Date: Sep 2016 Location: Vancouver BC Posts: 784	Re: Hood Insulation Ideas? What Do You Use?? Some cars have insulation to absorb the noise. Maybe keeping the paint cool will help it look good for a longer period of time? My stock 69 doesn't have any insulation under the hood. It's a base model. I happen to like the sound of the engine, so I have no plans to put any sort of insulation under the hood. __________________ Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible

11-07-2016, 10:03 PM	#10
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: Hood Insulation Ideas? What Do You Use?? It looks custom when you raise the hood. I'll admit that I added insulation under mine, but its mostly to lower the heat on my fiberglass hood.

11-08-2016, 08:34 AM	#11
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Hood Insulation Ideas? What Do You Use?? I see no point, other than protect fiberglass. The sun is the only heat that is hard on hood paint. never had a problem getting an engine to warm up on it's own. The heat comes from within that warms the mass. That's what a thermostat is for. The insulation would only hold heat in that had been created by the engine you wanted to warm up. The ambient temp is created by the object you want to warm up? The ambient temp is created by the warmed up engine. I don't see insulation making the engine too hot, though. The only issue I'd be concerned about is condensation created between hood and insulation being trapped __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

11-08-2016, 01:00 PM	#14
Jim70Chevy Registered User Join Date: Feb 2015 Location: Rocklin CA Posts: 88	Re: Hood Insulation Ideas? What Do You Use?? Thanks Lou! It is now on the list to buy. Jim __________________ "Every professional was once an amateur who didn't give up" My build 1970 Longbed CST/10

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