Sorry, no pictures, if you can locate pictures of the Old Mopar dirt track kit cars, we copied that system.
This was pretty much standard operating procedure on our dirt track. You had to have the bars to keep the car from bending at the firewall. (If the car survived 3 years, we were still bending the cars about 1 1/2" out of square and flat, right front to left rear!) We were running with 10" wide tires on a dirt track that was basically (2) 3/16 mile straights with two 180 degree, slightly banked U bends at the ends of the straights. We were turning our Mopar big block 383s 6,000 rpm in 3rd gear (we raced in 3rd because we couldn't afford a set of 5:13 gears) of the 4 speed at the end of the straight, where you braked hard, cranked the steering hard left until the car's rear came around and started to power slide, then it was full throttle as you cranked the steering towards the right, then gently steering back towards center until the next turn, where the process started all over again. One of the guys in our class ran an old Ford Police car that still had the functioning speedometer, according to him, he was hitting 85 before he braked for the corner. I believe he was slow! If we turned that track in a 30 second lap, we had to average 60 mph on the whole lap, and we were turning 28 second laps.
We ran in the lower class with a full bodied B body (and later a 73 duster) with everything unneeded removed. Car had to weigh in at 3200 with the driver sitting in the seat (we were usually towards the light end, especially with the Duster). We were lined up based on a time trial run, and we were generally in the 28:00 second range (about mid pack). The track was measured 1/2 mile on the inside edge of the track, and it was a clay based track (very good traction).
Sorry, got sidetracked. Without the bracing, the ties to the frame rails, and the roll cage,the car would have had a dangerous amount of flex in it going into the corners, and a lot of flex coming out of the corners with the car crossed up on the banking. When the car doesn't flex, you can make use of the power available to move the car forward without concern of the car doing something strange as it unflexes. Gene
