(Nervo/Coggin), Talon Chassis, Bullrider Racecars, Tad Fiser Race Cars, Rice Cars, Ashley Chassis, Cobra Race Cars, Storm Chassis, GT American, and Afco race cars. Cars are covered by body panels which are made of fiberglass, aluminum, or occasionally carbon fiber. Engine costs have driven a number of changes over the years. As the cost of the Deco engine platform continued to rise, Honda engines were adopted. The move from Deco to Honda was first highlighted by an exhibition race at the 1988 Western Grands in Pueblo, Colorado. Attempts to put the Deco/Continental engines back into production failed. Later problems with Honda engine revisions and parts tolerances led to the adoption of Briggs & Stratton engines as a cost-effective engine platform. This adoption has come in the form of both the World Formula and Briggs Animal engines. USAC started using Animal engines in 2010. QMA planned to introduce the Animal engine platform beginning in 2012 and begin phasing out the Honda platform altogether in 2013 but has not moved away from the Honda engine platform. USAC includes the Animal and Honda platforms. USAC has recently discarded all of the Deco platform and introduced the light and heavy modified World Formula for 2017. Engines and classes Red & Blue Rookie (USAC), Jr. Novice & Adv. Novice (QMA) - Honda 120 (stock, restricted) Jr. Animal & Sr. Animal - Briggs & Stratton Animal engine (stock, restricted) Hvy. Animal - Briggs & Stratton Animal engine (stock) Jr. Honda - Honda 120 (stock, restricted) Sr. Honda - Honda 120 (stock) Hvy. Honda - Honda 120 (stock with Honda GX 160 carburetor) Jr. Super Stock & Sr. Super Stock (QMA) - Deco (stock, restricted) Mod (QMA) - Deco (modified) Jr. 160 - Honda 160 (QMA) (stock with Honda GX 120 carburetor) Lt. 160 - Honda 160 (stock) Hvy. 160 - Honda 160 (stock with Honda GX 200 carburetor) B (QMA) - Deco (modified) Modified World Formula (USAC) - Briggs and Stratton World Formula (modified, methanol) AA/Modified World Formula (QMA) - Deco (modified, methanol), or Briggs and Stratton World Formula (modified, methanol) Lt. & Hvy. World Formula - Briggs and Stratton World Formula (stock) Junior classes are for drivers 5-8 years old, while senior classes are for drivers 9-16. Light classes are for drivers up to 100 lbs in normal street clothes. For heavy classes, drivers must be a minimum of 100 lbs. Half midgets (QMA) Half