*photos by: the author
Getting our Project Chevelle to corner with the help of Hellwig Products
There’s no getting away from the fact that the ’64-72 GM A-body is one of the most popular musclecars out there; with the Chevelle, Skylark, Cutlass, and Tempest/LeMans being among them. We have a couple A-bodies sitting around the Timeless Muscle Garage, but the one that’s been getting our undivided attention lately is Project: 88, our ’70 Chevelle SS396. Just in case you’ve missed the introductory story on our ’70 Chevelle, you can check it out here.
Since we’ll be restoring and modifying our Chevelle project as we go, we wanted to start small with our modifications and make the current format just a little more fun (and safer) to drive. Surely we could have installed modern brakes, upgraded wheels and tires, as well as a quick-ratio steering box but we wanted the best bang-for-the-buck, and we felt that Hellwig Motorsports‘ 1-5/16-inch tubular front bar (PN 55703) and the 1-inch solid, factory-style, 5800 rear sway bar fit the bill perfectly.
Why the suspension? Because one of the things that have always irked us about these old A-bodies was the way that they handled. The suspension was sufficient if all you wanted to do was cruise through town or run the 1320′ at your local dragstrip, but forget trying to put any speed through the corners. These cars were known for thier looks, straight-line performance and their soundtrack – not their handling prowess. We get spoiled with the technology found in today’s cars, and going from a 21st-century Camaro or Mustang and into something that was designed in the 1960s can leave you with something of a culture shock. We’d like to remedy that.
But before we started tearing into the car, we took our Chevelle to a parking lot down the street from our shop to baseline test the handling – just to get an idea of what we were up against. It wasn’t pretty; particularly with the lack of the factory rear sway bar, the remaining front sway bar proved to be a little overwhelmed and behind the times. The body roll was immense, almost laughable, and the occupants, as you can see in the photos, even struggled to keep themselves planted to the factory bucket seats. We should probably point out that these baseline turns were performed at speeds of no greater than 20 mph.
Obviously the original, dry-rotted rubber bushings would have an effect on handling, as would the older end links, but even with those components being a determining factor with our car’s handling characteristics, there’s something that’s to be said about the sway bar the car had left the factory with in the first place. You have to remember, these cars were designed at a time where the American population was a fraction of what it is today and the corner-carving European cars weren’t even at a level to compete with the Big Three in regards to market share. Times have certainly changed…
Looking for more insight before we installed the kit, we reached out to Hellwig’s very own Ben Knaus, their in-house Director of Engineering for his expertise. As Ben tells us, “when choosing a sway bar, the diameter is not the only thing to take into account. An 1-1/4 inch diameter bar can be a huge range of rates depending on how it’s mounted, the arm length, its wall thickness, the width of the bar, etc. We get a lot of guys comparing our bars with another company’s, and asking why our bars are a different diameter. Truthfully, they may actually be the same rate, since they’re different shapes.”
“When choosing a sway bar, the diameter is not the only thing to take into account.” – Ben Knaus, Hellwig Motorsports
He continued further, “the other trick is that some companies list rates as bar-only and some list the installed rate, which can be 20% different from losses in bushings and other factors. So [when you’re comparing our components to those of our competitors] just make sure you’re comparing apples to apples.”
He also added, “the other big thing is that bigger is not always better. Most of our bars are bigger than stock, but we tune them to the vehicle to get it to handle correctly. Just because someone else’s part is a larger diameter, it doesn’t mean it’s going to handle better.
“Bigger is not always better. Most of our bars are bigger than stock, but we tune them to the vehicle to get it to handle correctly. Just because someone else’s part is a larger diameter, it doesn’t mean it’s going to handle better.” – Ben Knaus, Hellwig Motorsports
If that was the case, all the suspension would just be solid mounted or use 3-inch diameter sway bars! I also should note that the front roll rate (the rate of sway bar plus coils) should always be larger than the rear rate. If your rear rate is larger, you’ll have oversteer and want to swap ends in the corners. It’s always better to shoot for neutral but, never on the understeer side.
Rick Seitz is the owner and founder of Timeless Muscle Magazine, and has a true love and passion for all vehicles. When he isn’t tuning, testing, or competing with the brand’s current crop of project vehicles, he’s busy tinkering and planning the next modifications for his own cars.