How-To: Handmade heat shield and intake - DISCUSSION
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How-To: Handmade heat shield and intake - DISCUSSION - 7/4/2007 5:43:29 PM
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TripleBlackBlazer
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Want the benefits of a Cold-Air Intake (CAI) such as K&N's, AEM's, Air Raid's, et cetera, but don't have the cash to blow? Not too sure about a 'kit' off eBay? Want the satisfaction of using your hands (and tools) to create one of your own? These instructions will work for 1996 through end of production for Chevrolet Blazers, GMC Jimmys, and Oldsmobile Bravadas equipped with the 4.3 Vortec.
The following will show you how to make your own CAI, all for under $100; all with pretty common tools (and with a little help from a friend). There is no drilling required and you can return your vehicle to stock if you so wish with no signs of any modifications made! I will attempt to be as informative as possible, please feel free to reply or PM with any questions. I am by no means a professional mechanic, but that's the beauty of this modification-you don't need to be! Please read entire how-to if you intend on building one of your own as there are some different options you may choose that will affect appearance and/or price.
TOOLS NECESSARY:
Phillips head screwdriver
Flathead screwdriver
10mm wrench or 10mm deep-well socket and ratchet
Hammer
Sheet metal snips (I used 7" straight snips, you may have better luck with smaller but I did not want to cut FEET of sheet metal with anything smaller)
Needle nose pliers
Scissors
Utility knife
Work gloves (if you intend on cutting the sheet metal yourself)
Sharpie marker
TOOLS NICE TO HAVE IF YOU HAVE ACCESS:
Center punch
Drill with 1/4" metal bit
Sheet metal shear
Sheet metal bender
Band saw/pipe cutter/Sawzall
3.5" metal hole saw
SUPPLIES NEEDED:
The following supplies were purchased at my local hardware store:
Minimum 24" wide by 24" long sheet metal (I used 24" wide by 30" long just to be safe)
3/4" by 1/2" corner braces (or similar hardware)
3" High-heat capable rubber coupling (usually comes with hose clamps but just in case...)
Two 3" hose clamps
Two (or more if you prefer) each of machine screws, washers, and nuts (all in same or smaller diameter as holes punched)
One sheet metal screw (see Step 2 under "Installation of Heat Shield..." for size)
4-5 feet of 3/8" fuel line (or similar high-heat capable material, i.e. hood weather-stripping)
7-8 inches of 1/4" fuel line or washer fluid hose
1 can of high heat paint (your choice of color, there are links under "Conclusion" that show the difference between flat black and aluminum)
1 tube of RTV sealant (not necessary)
3" Mandrel-bent, 45 degree pipe (I got mine from a local performance garage)
Spare cardboard lying around (a case of beer box is large and rigid enough)
DISASSEMBLY OF STOCK AIR BOX:
1. Locate the four screws that hold the top of the air box in place.
2. Loosen (but don't remove) each one with a Phillips head screwdriver.
 [link=http://i160.photobucket.com/albums/t193/NotoriousGLD/Blazer/IntakeHow-To003.jpg][image]http:
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/4/2007 5:44:00 PM
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EuroGoldLS
Posts: 3121
Joined: 2/9/2007
From: Princeton, NC, USA
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Can you make me one? j/k I work in a sheet metal shop...I can make it myself.
Moderators, Admins: Can we sticky this?
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My theory is that every disrict in the USA tries to send their lying scumbags to either prison or Washington D.C. -rivereye
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/4/2007 5:49:15 PM
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swartlkk
Posts: 14499
Joined: 5/1/2005
From: Waterloo, NY
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I was in the process of doing this! Had some trouble with a few of the links so it took me a bit.
Great How-To! Looks really good!!
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Kyle-
04 Rainier
My Restoration Projects
Please Do Not PM for Tech Help
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/4/2007 7:21:06 PM
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EuroGoldLS
Posts: 3121
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From: Princeton, NC, USA
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I think I'll make me one tomorrow... with company sheet metal...
I think I'll go further and insulate the box with duct liner... I'll try it and if it is good I'll post it.
< Message edited by EuroGoldLS -- 7/4/2007 7:26:15 PM >
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My theory is that every disrict in the USA tries to send their lying scumbags to either prison or Washington D.C. -rivereye
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/4/2007 8:33:11 PM
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TripleBlackBlazer
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Sorry Kyle, I know there were a lot of links. Just wanted to be as thorough as possible! 
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/5/2007 5:00:26 AM
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swartlkk
Posts: 14499
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From: Waterloo, NY
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No problem at all Gary! Something just seems messed up in our current forum software. I never used to have a problem, but then, the old post format was plain text with tags. The new format converts the tags making things a pain... Then it doesn't like to remember everything you copy and paste, LOL! It all worked out in the end, just took a bit more time to get sorted out.
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Kyle-
04 Rainier
My Restoration Projects
Please Do Not PM for Tech Help
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/5/2007 10:23:12 AM
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rabbit0102030
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From: GdUp, TEXAS
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Very nice bro! I'm quite impressed! This seems like a project I can take on, now that I have my own garage!
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June 2007 Ride Of The Month
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/5/2007 1:35:44 PM
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TripleBlackBlazer
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Pfffft, garage! Didn't you see the carpet in the background of the sheet metal template? I did this in my living room, LOL! Nah, I live in a two bedroom townhouse, and the landlord gets all heeby-jeeby if you even change a tire in your parking spot. Just had to make do! Thanks for the compliments!
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/5/2007 8:26:56 PM
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EuroGoldLS
Posts: 3121
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From: Princeton, NC, USA
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I just finished making mine, except, for me... it didn't cost anything... thats what is nice about having an Heating &A/C shop in your backyard...
Instead of using fuel line to outline everything, I used door edge molding. In the end it turned out great except my 11.5in filter is way too big. I'll have to downsize to fit it correctly. When I get a new filter, I'll take out everything ans soak it with white vinegar (to remove oil- sheet metal has a pre-oiled surface) and paint it black or aluminum silver.
I may go back (now that I know how) and make a new sheild and change some things it to better seal it.
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My theory is that every disrict in the USA tries to send their lying scumbags to either prison or Washington D.C. -rivereye
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/7/2007 12:24:15 PM
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sasquatchfound
Posts: 185
Joined: 5/28/2007
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Would that same set up you instructed on work in my 95 blazer? That would be so cool and i can do it myself. HEHEHE
Thanks.
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/7/2007 12:48:30 PM
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myol blue4x4
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From: War In (Warren) OH
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Well you could make one for a 95 but it would be a bit different because I am thinking about doing it to my 95 so I took a look at yesterday and the setup is different.
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-Gary
*1995 Brilliant Blue Metallic Blazer*
http://www.cardomain.com/ride/2680990
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/7/2007 2:30:54 PM
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sasquatchfound
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If you do one home made to your 95 could you post how-to? I would really appreciate it.
Thanks.
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any donor can be a father, but it takes a man to be a daddy.
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/7/2007 3:40:48 PM
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myol blue4x4
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Oh yeah, no problamo, with a general know how from tripleblack, I should be able to make one, it probably won't be till next week.
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-Gary
*1995 Brilliant Blue Metallic Blazer*
http://www.cardomain.com/ride/2680990
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/7/2007 8:55:16 PM
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TripleBlackBlazer
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Posts: 1963
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No this setup won't work for '95 or older. That's not to say it can't be done. The only reference point I had to build off of is what the K&N kit looked like for my year (2000).
If you can find mounting points and be creative, you can make one for your year as well. Just base it off this:
As long as you understand the concept of isolating the filter from the heat of the engine bay, you'll be fine. Not saying you have to, but the sectioned outlined in red in the picture below looks to be the best spot to make a heat shield.
Post up if you do make one, it would be an asset to our fellow Blazer owners! And trust me, it will feel GREAT knowing you made it yourself!
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/7/2007 9:16:22 PM
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myol blue4x4
Posts: 484
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From: War In (Warren) OH
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Yeah I know it would be totally different and I already took pics of the disassembly but I am going to do the whole intake. I priced mandrilbent 3" tube and I need two 45 degree tubes so I am just going to buy a generic intake off of ebay and make a heat shield for it. I will be posting on it as well. Also if I were to get the tubing and filter it would be priced the same as this one below that I am getting off of ebay.
Thumbnail Image
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< Message edited by myol blue4x4 -- 7/7/2007 9:22:42 PM >
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-Gary
*1995 Brilliant Blue Metallic Blazer*
http://www.cardomain.com/ride/2680990
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RE: How-To: Handmade heat shield and intake - DISCUSSION - 7/8/2007 8:33:57 AM
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sasquatchfound
Posts: 185
Joined: 5/28/2007
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Hey tripleblack that look like easy to make home made. Only 2 questions though is the cradle a needed item? and what is the diameter of the tube needed? That is all i need to make this work and i will post what i do.
Thanks.
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any donor can be a father, but it takes a man to be a daddy.
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