Project Payback 1968 Pontiac GTO Build Updates

Street Muscle dives head-first into the Pro Touring scene with Project Payback, a 1968 Pontiac GTO built for autocross competition time trials. We’ve partnered with Schwartz Performance and Chevrolet Performance to give the classic muscle car modern performance.

Project Articles

October 30, 2019 – Things Are Getting Serious

Between the $10K Drag Shootout and the Junkyard Challenge it was hard to get some shop time. Especially with the amount of work that was needed to get this project going. But finally things are starting to get fun again. My long-time friend Greg Lovell of AntiVenom agreed to fly in and bail us out of our backlog by tackling the GTO and a few other projects, while the rest of the crew worked on the race car. Greg made quick work of the GTO: bolting up the Lingenfelter-tuned LT4 and Chevrolet Performance clutch, bellhousing, and T-56 Magnum combo – then lowering it onto the frame. The Schwartz Performance chassis came with Gen V-specific adjustable motor mounts (yes, they are different than LS engines), which are pretty trick because they help set the engine back pretty far up against the firewall. The big-block was much more centered, but also not as far behind the axle centerline. This means our weight distribution will be much better. We’ll be going with an aftermarket A/C system, so there was no need to clear the large evaporator box along the firewall.

For the transmission, Silver Sport sent us everything we needed for pedals, hydraulics, and wiring. It is crucial that you use proper pedals as I found out on my G-body project, simply retrofitting a pedal that was designed for a mechanical clutch linkage is not typically a good option. Greg had to cut the floor for additional tunnel clearance. Silver Sport provided a template, but our aftermarket chassis appeared incompatible. He bent some sheet-metal and away he went – it came out great! The tunnel was capped off by a piece of tin from Silver Sport with the shifter cutout to place it within a factory center console. Having been in T-56 equipped A-bodies before, I really liked this option. The last thing you want is uncomfortable shifter location. Silver Sport has a few options on their kits, and this is one of them.

For the next phase, we are measuring for the radiator and heat exchanger as well as the wheels and tires. Stay tuned for more updates as we get closer. In the mean time, I have to figure out what to do with this stock frame…

August 12, 2019 – If I Said You Had a Beautiful Body…

When I think of a “muscle car” I think of an A-body. The lines are what drew me to purchase the GTO and start this project, and so it was very important that they be preserved and perfected. Thankfully I had a fantastic body shop at my disposal, Best of Show Coachworks, that was able to mate the National Parts Depot quarter panel skins to the existing body. The area that mates to the deck lid on the rear-facing portion of the quarter panel had to be made by hand. We also found that fitting the aftermarket Endura bumper was incredibly tricky. There isn’t any give to the material to shape it, so the best you can do is make adjustments. Check out the full story for more info.

March 16, 2019 – Saying Goodbye to Old Ways

The ’70s Pontiac 400 and Turbo 400 that came in the GTO found a new home. I was very happy that within just a few days its new owner had it up and running in his ’68 Firebird. As much as some may question the use of a “Chevy” engine in the Pontiac, in doing so I have helped give life to someone else’s project. So that was nice to see.

March 15, 2019 – The Chassis Hath Arrived

As they say, perfection takes time… But at long last, our beautiful new chassis has arrived from Schwartz Performance. Rolling off the enclosed transport, behind a flawless Thunderbird and a Nova I would have happily tucked away in my garage, the Schwartz chassis gleamed in the SoCal sunlight. Complete with wooden wheels, I sat on it and made engine noises until it was time to roll it into the shop.

The Schwartz G-Machine chassis is not just beautifully formed, welded and powder coated, it has many subtle features that we will attempt to touch on here. For starters, it comes completely assembled. Yes, completely. Second, all of the brake lines are run through the frame like a high end motorcycle or bicycle. It has a modern rack and pinion, so it steers like a brand-new car; Ridetech coilovers, which are manufactured by Fox Racing; and splined sway bars. Overall it is a healthy mix of “street” and “race,” which is just the way any Pro Touring vehicle should be. Best of all, it still relies on a parallel four-link. This suits my driving style, comfort level, taste, and (frankly) budget nicely – much better than a 3-link or torque arm suspension.

Another awesome feature of the Schwartz chassis is that it allows for a variety of transmission and engine combinations. Ours came with the billet aluminum engine mounts for a Gen V small-block, but if we later decided to go back to a Pontiac engine we could. And there is even some adjustability in the engine position, should you want to push the firewall back for better weight distribution. Honestly, that is tempting and something we may consider down the road. At the very least it takes into account any OEM variances between the various A-bodies as well as what 50 years of heat cycling and, well, life can do.

For an in-depth look at the chassis you’ll need to stay tuned for a full story on Street Muscle. In the meantime, we’ll keep updating you as we prepare to put the ‘68 GTO under the knife.

January 12, 2019 – New Year, New Project for Street Muscle: Pro Touring 1968 Pontiac GTO

In August we introduced Project Payback, our 1968 Pontiac GTO – a Pro Touring machine with a downright nasty attitude. If you like A-bodies, Pro Touring and watching tires being spun in anger, this is the project to follow. There is no shortage of autocross events specifically for muscle cars in Southern California, not to mention three excellent road courses within 3.5 hours drive. Ultimately we’d like to see what Project Payback can do on a larger stager at Ultimate Street Car events and the Holley LS Fest.

But, first things first, let’s get to the building. We spent the second of last year planning for the first stage of the build while the initial body work was being completed. We were extremely fortunate that National Parts Depot had everything that we needed to repair the sheet-metal on the quarter panel and fender that had been poorly slathered in body filler prior to purchase. NPD and Best of Show Coachworks have been great partners thus far in the build, and we should be publishing that body work story here soon.

On the mechanical side, we have taken delivery of the entire powertrain. I know there will be purists that say Poncho power is all you need, but we decided to go a different direction on this build. It is true that a stroker kit, valvetrain upgrades, aluminum heads and intake with a quality carb or EFI setup will be make over 700 horsepower naturally aspirated using the factory 400 block. However, our intentions on this build were not to be quite so faithful for nostalgia’s sake. Instead, our goal is to win. We need the sort of reliability that will allow the car to run well on track with minimal changes despite dramatic elevation and atmospheric changes, to drive cross country if needed, and to withstand sustained as well as oscillating lateral g-Forces. For that reason we chose a dry sump Chevrolet Performance LT4 crate engine. And to back it up, we have a Chevrolet Performance T-56 Magnum 6-speed manual transmission and Silver Sport A-body conversion kit.

Not to take anything away from the 650 horsepower powerplant, but the key factor in making the larger A-body hang with some smaller and lighter setups on the autocross course is the chassis and suspension. I put a great deal of research into figuring out what was going to make this car the most competitive, and ultimately it was clear that we needed a whole chassis rather than some bolt-on suspension upgrades. This car had a rough life, so the stock chassis may not be in the best condition (though its measurements did checkout OK). Thankfully Schwartz Performance had us covered. I have been watching their Tempest run for years, so turning to some fellow Pontiac lovers seemed like a natural choice for the GTO. Since second-gen A-bodies come with a 4-ink and coil springs in the rear, the biggest benefits by going with an aftermarket chassis are rigidity and modern steering. Schwartz says its frame is torsionally 200% stiffer and weighs 125 pounds less than the stock chassis. Of course, we will have many other killer parts built into the Schwartz package including massive Baer brakes, Ridetech coilovers, and a Moser full-floating 9-inch. Oh, yes, we’ve come to play.

As I type this, Schwartz is finishing up the chassis to get it assembled and shipped off to PAM’s HQ where we’ll be doing most of the mechanical work on the GTO. Stay tuned for another update when the chassis arrives.

 

About the author

Scott Parker

Scott dreamed of being in the automotive media in high school, growing up around car shows and just down the street from Atco Raceway. The technology, performance capability, and craftsmanship that goes into builds fuels his passion.
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