The No. 13, a 1967 model Chevelle,...
The No. 13, a 1967 model Chevelle, with 1966 front fenders and hood, was one of, if not the, most innovative stock cars ever built. It was markedly different and more advanced than any other stock car of its day. Follow along as we discuss the technical merits of this wonderful race car built by master mechanic, Smokey Yunick.
In the winter of 1967-1968, Smokey Yunick built the second of two Chevelle NASCAR stock cars, the first driven by Curtis Turner who put it on the pole for the 1967 Daytona 500 and crashed it at Atlanta, destroying it. The legend and folklore that surrounds this second car is by far bigger than any car in the history of stock car racing. It was not only aerodynamically advanced, but as we now know, the design of its suspension system was advanced far beyond its years.
Numerous articles have been written over the years with varying descriptions about what went on with this car, discussion about if and how he did this and that, and even in Smokey's book he leaves out some juicy details that were shared with me in 1997 in a casual conversation. Some of the minor details will never be fully known, but the following is what I know from talking with him about it.
The real story starts with Smokey working all winter building this car. At that time, stock cars were basically highly modified street cars where you would strengthen the stock components, remove unnecessary parts and pieces, install a rollcage, build up the motor, throw on some fat tires, and go racing. That was OK, but not Smokey's way of doing things. You see, he had been to Indy and had discussed chassis engineering with some of the best engineers in racing. He came away from that with a better understanding of what a race car needed to be. He was going to change the way stock car racing was done.

The interior of the car was...

The interior of the car was sparse compared to today's stock cars. Missing are the cross braces alongside the driver. Installed is the industry standard Ford Econoline van seat with reinforcing for the ribs and hips. The fire suppression system consists of a single fire bottle, another standard of the day. And, the floor was lined with heat and sound suppression material.

The front bumper was fitted...

The front bumper was fitted to the fenders and the front of the hood tightly for better aero efficiency. All door handle holes and other recesses were filled in. The overall body was hung in a shape that was not strictly according to stock dimensions. Various writers have alluded to the dimensioning as being 15/16 or 3/4 sized, but in reality, it was shaped to be most efficient from a drag standpoint.

One neat little trick we saw...

One neat little trick we saw was the back of the car's roof. At the very rear, above the rear window, we see where Smokey lipped the edge up to kick air flowing over the roof up and over the small spoiler at the rear of the trunk lid. It was this attention to detail that made each of Smokey's cars unique.
As we will see, this was to be a car that in many ways was like the NASCAR race cars of today and in some ways, more advanced. Unfortunately, this car never raced, even once. As Smokey labored away, he got a cold that turned into, basically, walking pneumonia. Several weeks before the 1968 Daytona 500 week, according to Smokey's book and the interview I had with him in 1997, he called Big Bill France and asked him if there were going to be any problems with this car getting through inspection. He was assured that everything would be OK. Up to that point, he and Bill were friends.
Then when he arrived at the track, in inspection, he was handed a list of things he had to fix in order to be able to race the car. At the top of the list was to change the frame to a production Ford frame, like everyone else was using in those days because of the strength. Smokey had built an entirely custom frame, much like those in today's Nascar Sprint Cup race cars. The entire car was built around that frame. His car was basically outlawed then and there.
If you've ever read anything at all about Smokey, you will know that he had somewhat of a temper. Well, he lost it. The officials refused to give him fuel, so, as he told me, he asked one of his crew to go outside the track and get 5 gallons in a can. Knowing he would get fuel somehow, they relented and pumped some racing fuel into a can. He dumped that into the tank, fired it up, and drove over to the trailer to load it up.
Somewhere along the way, Smokey changed his mind. Instead, he drove out of the track onto Volusia Ave. (now known as International Speedway Blvd.) and toward his shop at the far end of mainland Daytona. Some writers in the following years, disputed he did that. I grew up in Daytona and was standing on the corner of Volusia and Campbell St. (now known as MLK Blvd.) when he stopped at the red light. When I told him I had seen him stop at that light, his reply was, "Well, that's the only one I stopped at."
Smokey went on to tell me that when France arrived at his shop soon after he had, he picked up a 4-pound hammer and threw it at him, missing by inches and striking France's new Pontiac in the front fender leaving a big ol' dent, at which time Big Bill left.

At the rear we see where Smokey...

At the rear we see where Smokey closed in the area under the fuel tank and extended the flat surface to the rear bumper. This eliminated the parachute effect of an exposed rear bumper. We also get a glimpse of the Watts link behind the rearend, an unheard of innovation not ever used on stock cars of the day.

The interior behind the driver...

The interior behind the driver was well constructed with cross bracing to the rear clip and a support brace to the right upper rollbar hoop. Note the tunnels constructed in the floor well to the right of the driveshaft tunnel. These were built in to allow clearance for the trailing arms of the three-link rear suspension. Read on . . .

The fuel tank quick fill tube...

The fuel tank quick fill tube location conflicted with the support brace tube to the rear frame and so Smokey built a box tube around it. He evidently needed the angle in the fuel fill tube to be what it is and there was no moving the fuel tank, so the solution was to go around the support tubing.