Products to Compare (max of 3)
Compare These Parts

How to Reduce Under Hood Temp - Exhaust Wrap

Tags: Tech, Tech, Hot Rod, Street

To assist with keeping under hood temperatures down you may want to try wrapping your exhaust. Even though I am running stock cast iron exhaust manifolds on my 454 I was able to utilize Speedway Motors part number 91013804, 1-inch by 50-ft Black Header Wrap. Every little bit helps with keeping your car cool on those hot summer days when cruising. And with the smaller 1" design I was able to wrap the manifolds with sharp bends around the primary tubes fairly easily. Of course, it would be a lot easier to do this with the manifolds off of the car and I highly recommend removing them to wrap them. However, I gave it shot with them still on the vehicle.

Before I started I devised a plan of attack. I started with the first primary tube and wrapped it down to the main collector and past the second primary. For this, I wrapped one complete revolution around the primary tube, then removed the wrap and folded it over itself. Then I could gauge how much wrap I needed by overlapping the folded over portion working my way down the tube without actually wrapping it. That way I wasn't feeding 50-feet of wrap through a small area. Once I cut the length of wrap I needed to start I secured the top of the wrap by the head using Speedway Motors stainless steel exhaust wrap ties, part number 91560014 in 14 inch length. To secure this style of tie you feed the length through the head just like a normal zip tie.

However, the head on these don’t have a clip and the length of the tie is smooth. So you pull it tight onto itself and cut the excess off. I then used a pair of needle-nose pliers to roll the end over on itself up to the head of the tie to secure it tightly and not leave any sharp edges to catch on.

With the first primary tube wrapped I moved to the second and repeated the process until the entire exhaust manifold was covered. This was fairly easy to accomplish with the exhaust manifold still on the car and leaning over the fender. But as I stated earlier it would be a whole lot simpler to wrap the exhaust manifold off the vehicle and re-install.

I did extend the wrap all the way down the downpipe on my exhaust as well utilizing 50-feet of wrap per side. With both sides done I noticed a considerable difference in heat exposure versus the unwrapped manifold. This resulted in dropping my underhood temperatures and keeping my Big Block Chevy running cooler. It also gave my vehicle that old school performance look and covers up a pretty unsightly cast iron manifold.

Products Featured in this Article

Related Articles

Steering Shaft and U-Joint Selection Guide
by Speedway Tech Team - Posted in Tech
Designing a steering system for your street rod or muscle car can be tricky. In this buyer's guide we'll show you how to choose the right steering U-joints, steering shaft, and accessories to complete the job quickly and safely.
Create the Perfect Exhaust Note with Performance Mufflers
by Mark Houlahan - Posted in Tech
We all want that tough, aggressive exhaust note emanating from our hot rod, muscle car, or classic truck's tailpipes, but which muffler is best suited for your project vehicle? We're here to help with our muffler buyer's guide!
Best Brake Boosters for Better Braking
by Mark Houlahan - Posted in Tech
Power brake boosters offer lower pedal effort and better braking characteristics, but which one is right for your hot rod, muscle car, or truck? We take the guesswork out of that question with our latest buyer's guide.
Solid Axle Choices for Your Traditional Hot Rod
by Eric McMillan - Posted in Tech
When it comes to a traditional style build on an early hot rod it just has to be rolling on a solid front axle of some sort. In this buyer's guide we take you through I-beam and round tube solid axles, spindle choices, radius rod needs, and more.
Wrapping Exhaust Manifolds to Reduce Under Hood Temps
by Kevin Webel - Posted in Tech
Learn how to wrap exhaust headers to help keep under hood temperatures down. This articles shows how cast iron exhaust manifolds are wrapped in 1-inch black header wrap with stainless steel exhaust wrap ties.
A Guide to Installing Adjustable LS Motor Mounts
by Jeff Behrens - Posted in Tech
Follow this step by step guide on how to install adjustable LS motor mounts to set your engine location exactly where you want it.
How to Install Grille Trim and Grille Extensions
by Tyson Jurgens - Posted in Hot Rod
See how a 1969 Chevelle gets an upgraded grille! Learn the pros of using the Dynacorn trim and extensions and some helpful tips for a successful install.
How to Install an Electric Motor Kit for Exhaust Cutouts
by Kevin Webel - Posted in Tech
A guide on removing and installing a new electric motor kit for exhaust cutouts.
Installing a Speedway Motors Wiring Kit - 1967 Chevelle
by Jeff Karls - Posted in Tech
This Chevelle project gets rewired with a Speedway Motors wiring kit. Follow along as Jeff guides you through this application, starting with a good mounting location for the fuse box. Learn more on continuity, grounding and relays.
How to Install an EFI Fuel Tank - 1967 Chevelle
by Jeff Karls - Posted in Hot Rod
A step by step on how to install an EFI Fuel Tank kit in a 1967 Chevelle. Learn the benefits of using this kit including expanded fuel capacity and a 24 gallon tank.