These upper A-frame mounts from A&A Manufacturing allow racers to quickly adjust anti-dive. They’re applicable to a wide range of divisions, from modifieds and late models to stock cars and hobby stocks.
“Anti-dive can be adjusted on the fly, simply by changing the slugs,” said Jim Fairbanks, of A&A Manufacturing. “The change can be accomplished in minutes, between races, offering the racer a wide range of adjustability.”
Racers weld the upper A-frame mounts to the chassis. A&A Manufacturing offers seven measurements of slugs (aka bushings) to adjust anti-dive. The company constructs the mounts out of 3/8″-thick mild steel. Likewise, they manufacture the slugs out of mild steel, too, but they also zinc-plate them to prevent corrosion.
For GM Metric applications — part number LZ-10-F for lefts; LZ-10-G for rights — the slots measure 3/4″ by 1-1/2″. The mounts themselves are 4.0215″ tall on one side and 3-3/4″ tall on the other. The distance between the slots is 6-7/8″, from center to center. $12.55 each.
For Camaro-style (1974–81) applications (part number LZ-10-E), the distance between the slots is 7-3/4″, from center to center. $13.25 each.
For other applications, use part number LZ-10-H. It has one hole for anti-dive bushings. The mount measures 3-3/4″ tall and 2-1/4″ wide. The slot is 2-5/8″ from the bottom of the piece. $5.25 each.
The anti-dive bushings (part number LZ-10-D), or slugs, have a .505″ hole. That hole comes offset by one of seven measurements offered: 0″, 1/16″, 1/8″, 3/16″, 1/4″, 5/16″, and 3/8″. Each bushing comes with its offset clearly etched on it. $7.71 each.
A&A Manufacturing manufactures the upper A-frame mounts and bushings in the USA, directly from their Michigan facility.
Spring Lake, Michigan
Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. The content was subject to approval of A&A Manufacturing.
This year marks the Outside Groove Director of Photography’s 51st year of covering auto racing. Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticut’s Stafford Motor Speedway in 1970. Since then, he’s been a columnist, writer, and photographer, in racing and in mainstream media, for several outlets, including the Journal Inquirer, Boston Herald, Stock Car Racing, and Speedway Illustrated. Among Adaskaveg’s many awards are the 1992 Eastern Motorsport Press Association (EMPA) Ace Lane Photographer of the Year and the 2019 National Motorsports Press Association (NMPA) George Cunningham Writer of the Year.