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More Aerodynamics for your Talladega and Spoiler II

Here is another reprint from the Speedway Fords and Mercurys newsletter from back in the day. This is something I have never seen before; it is a way to improve the aerodynamics of the Talladega and Spoiler II. This brief article provides no details of how much these help and if they were intended for street use or race car applications. When you are hunting for every 1,000 of a second on the super speedway or drag strip who knows what the hot trick might be.
Does anyone have any additional information on this modification that would add some light on it benefit and application?
Thank you to Team Member Steve Marek for making these publications available to all of us.
Here is an ad from back in the day I thought you might enjoy!
NASCAR Talladega teams used this same trick in 1969 until stamped aluminum headlight buckets replaced the stock pot metal units in March of that year (at Atlanta when the Boss 429s and the Spoiler IIs made their competition debut)
Thanks John, your historical knowledge on these cars is remarkable and greatly appreciated.
Ralph Young was Benny Parsons crew chief on the car that I now own. He told me that they cut 1-1/2 inches out of the front of each fender and tapered the cut back then welded the fenders back together at the front and narrowed every thing else on the front, not legal,making the front of the car 3 inches narrower. They were never caught. Barry
Maybe BP wasn’t, but others were. Donnie Allison told me about the time he and the guys had to stay up all night widening fenders back to spec when Banjo’s Talladega team got caught. The narrower than stock bumpers in Jason’s stash of Banjo goodies are proof positive of some of thise sheetmetal liberties.