General As part of NASCAR's unification of the two Camping World Series in 2003, the cars can be either a 105-inch (2,700 mm, which had been used in the former Busch Grand National East) or 110-inch (2,800 mm, which had been used in the former Winston West)
wheelbase. Cambered/off-set rear ends are not allowed. Currently, the series requires the use of a Five Star bodies composite body that started in the 2015 season, currently the 2013
Chevrolet SS,
Ford Fusion, or
Toyota Camry, as well as the
Ford Mustang. Since the 2007 debut of the new chassis at the Cup and 2010 debut at the second-tier level, many ARCA East and West cars are former Cup or Xfinity cars. Teams have an option of building their own engines or they may run a specification engine, similar to what is used at many short tracks. Both engines are V8, pushrod, 12:1 compression motors. "Built" motors are built to team specifications using any configuration of pieces as long as it still meets NASCAR specifications. The spec engine is built using NASCAR-approved pieces that may be purchased from an approved supplier. The engines may be purchased as a kit or pre-assembled. All of the spec pieces are individually encrypted with a barcode for verification and tracking purposes and can be checked during the inspection process with an encryption reader. NASCAR has a specification supplier for the series-specification engine. When the series first started, the cars ran a V6 engine with a maximum displacement and no compression limit. In the early/mid 1990s the V8 engine with a 9.5:1 compression and maximum displacement was introduced to the series as an alternative to the V6 engines. Due to the decrease in popularity of the V6, it was phased out for the 1999 season. When the East and West series rules were combined, the compression ratio changed to 12:1. Menards Series cars use Sunoco racing fuel, NASCAR's specification fuel. For races run with national series, the cars run an E15 blend since the national series uses such fuels. The cars use radial tires. Along with the rest of ARCA and NASCAR's international series, the Menards Series have
General Tire as their exclusive tire supplier. On November 4, 2014 at the
SEMA Show in
Las Vegas,
NASCAR president
Mike Helton unveiled a new body style for the K&N Pro Series based on the
NASCAR Cup Series Gen 6 models. The new body, developed with Five Star Race Car Bodies, is constructed of a composite laminate blend and designed with easily replaceable body panels, expected to shrink the costs of fabrication dramatically. The body style is eligible for use in both Menards Series competition and
ARCA Racing Series competition, replacing the old Gen 4-style steel bodies after 2015, and the then-current one-piece composite body after 2016. The
Ford Mustang was introduced in 2022 and has been used alongside the Fusion.
Specifications •
Engine displacement: 358 cu in (5.8 L)
Pushrod V8. •
Transmission: 4 speed
Manual. •
Weight: 3,300 lb (1,497 kg) Minimum (without driver). •
Power output: ~650 hp (485 kW) unrestricted. •
Fuel:
Sunoco Leaded or Unleaded gasoline. •
Fuel capacity: 22 U.S. gallons (83.2 L). •
Fuel delivery:
Carburetion. •
Compression ratio: 12:1. •
Aspiration:
Naturally aspirated. •
Carburetor size: 390 cu ft/min (184 L/s) 4-barrel. •
Wheelbase: 105 in (2667 mm)/ 110 in (2794 mm). •
Steering:
Power,
recirculating ball. ==List of champions==