How To Install Dynamat Xtreme Custom Cut Kit On A GM A-Body

Installing It At The Grand National Roadster Show 2022 With Just A Dynamat roller!

By John Gilbert   –   Photography by the Author & Brian Brennan

What better way to demonstrate Dynamat’s Xtreme Custom Cut Kit made for GM A-body cars can easily be installed by using just a Dynamat roller than to prove it in front of hundreds of folks at the Grand National Roadster Show 2022? Custom cut means Dynamat’s sound-dampening material is precut to fit a specific make of car or truck and only requires peel and stick for installation. Then mash it flat with a Dynamat roller and it’s done.

02 At the GNRS With Just A Dynamat roller
Dynamat Xtreme Custom Cut kits are pre-cut, peel-and-stick custom-fitted pieces that require only a roller tool for installation.
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Read More: America’s Most Beautiful Roadster 2022 Winner, ’34 Chevy

The saga of this 1966 Chevelle Malibu project dates back over five years ago when I had just been given the editorship of Chevelle magazine. I had never owned a Chevelle for the street before, but in the mid ’70s I did buy a few 1966 Malibus for around $200, so my race crazy friends and I could cut them up to roundy round race at Irwindale Speedway on Saturday night.

03 Harolds Hot Rod Shops guys removed the front bench seat and rear seat lower half to gain access
Harold’s Hot Rod Shop’s guys removed the front bench seat and rear seat lower half to gain access to install the Dynamat Xtreme Custom Cut kit.

The 21st century was high time for me to repent for the Chevelles I had destroyed racing decades ago and, besides, I didn’t want readers asking if I owned a Chevelle and didn’t. The ’66 SS396 Chevelle has always been a favorite of mine since early 1966 when my dad and I searched for SS396s on Clippinger Chevrolet’s new car lot in Covina, California. It was spotting the distinctive twin inline scoops on the SS396 hoods that sped up our search locating SS396s on Clippinger’s lot.

04 A body family is that the platform allows B105 Custom Cut Dynamat to fit Chevy Pontiac Buick and Olds compacts
The beauty of GM’s A-body family is that the platform allows B105 Custom Cut Dynamat to fit Chevy, Pontiac, Buick, and Olds compacts.
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In my search to buy a project ’66 Chevelle I wasn’t concerned whether I found a real SS396, I was going to have an SS396 hood on whatever model I found. I soon discovered ’66 Chevelles were hard to find for the money I had hoped to spend. Enter my good friend Brian Shaw, a CPA and magazine project car enabler with the funds to enter as a half-owner and co-conspirator.

05 Dynamat Xtreme Custom Cut kit instructions come complete with a map for the floor kitDynamat Xtreme Custom Cut kit instructions come complete with a map for the floor kit
Dynamat Xtreme Custom Cut kit instructions come complete with a map for the floor kit, making it easy to understand where the pieces fit.

Shaw located the Chevelle for sale in California’s high desert belonging to a guy who believed storing used disc brakes wrapped in a heavy quilt in the trunk was a good idea. Typical for many A-body cars the trunk floor was rusted out from rain damage. It was this damage that allowed Shaw to get the last $1,000 off the asking price.

Read More: Classic Car Restoration: 1931 Model A Ford

06 Removing the front bench seat and the bottom of the rear seat are all that is necessary
Removing the front bench seat and the bottom of the rear seat are all that is necessary to install the B105 Custom Cut Dynamat floor kit.

Shaw and I got the Chevelle’s four-barrel 283 engine with an overdrive 3 speed transmission to run and drive. The first tech story was how to find and buy a good used Chevelle followed by an upholstery tech then installing Coker radials with Wheel Vintiques 15-inch wheels. Twice I had featured our Chevelle in a cameo spot on the cover of Chevelle when my friend Harold Clay of Harold’s Hot Rod Shop in Enid, Oklahoma, offered to install a new trunk floor and paint the car. I was expecting a scuff and squirt paintjob, but that’s not how Clay rolls.

07 A damp Mothers microfiber towel worked great to wipe out and ensure dirt and sand wasnt trapped beneath
A damp Mothers microfiber towel worked great to wipe out and ensure dirt and sand wasn’t trapped beneath. Although dirt will not affect adhesion.
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We trucked the Chevelle to a halfway point in New Mexico where Clay met us and hauled the Chevelle back to Enid. Clay and his guys stripped the Chevelle down to the bare chassis. With the body off the frame, Harold’s Hot Rod Shop commenced the major bodywork by installing a new Auto Metal Direct trunk floor. Ultimately, the Chevelle left Harold’s Hot Rod Shop with a concours quality PPG paint job that garnered the car a First Place win in its class at the Grand National Roadster Show in 2022.

08 Josh laid out the individual Dynamat Xtreme pieces outside the car flat on the ground to help identify their position inside the Chevelle
Josh laid out the individual Dynamat Xtreme pieces outside the car flat on the ground to help identify their position inside the Chevelle.

Once Clay completed the Chevelle to his unrelenting high standards, the die was cast and putting the car back together had to be met constructing it with the finest components available. Underhood there’s a FiTech-injected Chevrolet Performance ZZ454 backed with a Silver Sport TREMEC transmission.

09 Next he left the wax paper backing on the individual Dynamat pieces to pre install
Next he left the wax paper backing on the individual Dynamat pieces to pre-install, pushing them into shape to verify correct placement.

Creature comforts start with a Vintage Air Monster brushless cooling fan/shroud and Front Runner serpentine belt system on the 454 big block powering Vintage Air air conditioning. Air conditioning alone cannot keep the interior of a car cooled to satisfaction, which is one of the reasons for installing Dynamat Xtreme.

10 Once the backing is removed and Dynamat is installed it is extremely difficult to remove
Once the backing is removed and Dynamat is installed it is extremely difficult to remove. Confident of the fit, the top of the Dynamat is tacked into place and then the backing is peeled off.

Read More: 1967 Chevy Chevelle Goes From Drag Car To Street Beast

Beyond holding the cold in summer or keeping the heat in winter, another good reason for using Dynamat is noise suppression. Outside the ZZ454 shakes the ground, but thanks to Sanderson headers running through a MagnaFlow muffler stainless steel exhaust system combined with Dynamat Xtreme, the healthy baritone exhaust note is hardly audible inside. MR

11 Final installation begins with pushing the Dynamat down into place by hand
Final installation begins with pushing the Dynamat down into place by hand, followed by using the Dyna-Roller installation tool to compact the Dynamat flat.
12 an inspection was made to ensure the wiring harness was not trapped under the Dynamat
Before moving forward an inspection was made to ensure the wiring harness was not trapped under the Dynamat. Afterward the harness was moved clear.
13 Notice installing the Dynamat Custom Fit kit started at the driver side toeboard
Notice installing the Dynamat Custom Fit kit started at the driver side toeboard (floor). Next, before sticking in place, it again was checked for fitment.
14 Cutting the backing from the holes punched for the seat belt mounting bolts in Dynamat should be done first
Cutting the backing from the holes punched for the seat belt mounting bolts in Dynamat should be done first to help installation alignment.
15 the back seat passengers floor the seat belt mounting hole in the Dynamat was adhered centered over the bolthole first
For the Dynamat pieces for the back seat passenger’s floor the seat belt mounting hole in the Dynamat was adhered centered over the bolthole first.
16 Josh used the Dynamat Roller to press flat on the passenger side that fits beneath the seat
Josh used the Dynamat Roller to press flat on the passenger side that fits beneath the seat. Installation time start to finish is 35 minutes to install the complete floor kit.
17 A larger tunnel was fabricated to accommodate the TREMEC six speed transmission
A larger tunnel was fabricated to accommodate the TREMEC six speed transmission. The Dynamat intended for the stock Chevelle tunnel fit perfectly over the larger tunnel.
18 The Chevelle drove out of the GNRS much quieter inside than it drove in
Reinstalling the front seat 40 minutes after the front seat was removed to start the job. The Chevelle drove out of the GNRS much quieter inside than it drove in.
19 It must have been the Dynamat we installed during the show that made the difference
No one was more surprised than the HHRS crew when the 1966 Chevelle took First Place in Class at GNRS 2022. It must have been the Dynamat we installed during the show that made the difference.

Sources

Dynamat
(513) 860-5094
dynamat.com 

Harold’s Hot Rod Shop
(580) 548-3033
haroldshotrodshop.net

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