Rules and Regulations

The Super Stock class aims to ensure fair competition and safety standards.

All boats entered into the class must be between 28′ and 32′ in length, with a minimum weight of 4900 lbs. They are not allowed to have external wings, air foils, or movable deck surfaces.

The engines used must meet certain specifications, including approved models and restrictions on modifications. Propellers must be approved by APBA, and only cast stainless steel propellers are allowed. Safety measures are also emphasized, with requirements for cockpit construction standards. These are just a few of the important features of the Super Stock class rules.

Official APBA Super Stock Rulebook

APBA Rulebook

For a complete understanding of the rules, it is recommended to refer to the official APBA Super Stock Rules, which can be found at APBA.org. These rules provide comprehensive details regarding dimensions, weight requirements, engine specifications, propeller regulations, safety standards, and more. It is essential for participants and enthusiasts to familiarize themselves with these rules to ensure compliance and fair competition in the Super Stock class of offshore powerboat racing.

Requirements

Details for all boats in the Super Stock Class
  • Boats must be 28′ to 32′ catamarans.
  • The minimum weight requirement is 4900 lbs.
  • The maximum tunnel width is 63″.
  • For boats built before May 1st, 2022, retrofitting to the Lavin/UIM Standards is mandatory.
  • No external wings, air foils (fixed or adjustable), or movable deck surfaces are allowed.
  • All ballast must be securely fixed and not adjustable while racing.
  • Approved Engine: Mercury 300xs, 2006-current, 300 hp, 3.2L (193 CID) with Sportmaster lower unit.
  • Cowlings: Lightweight facsimiles of the production cowling are allowed, with manufacturer decals.
  • Powerhead: Must remain stock as produced by the manufacturer.
  • Balancing and Blueprinting are not allowed.
  • Compression ratio: May not be altered.
  • ECU boxes: May not be modified or reprogrammed, maximum RPM allowed is 6500.
  • Flywheels: No modifications or lightening is allowed.
  • Reeds: Any reeds are allowed, but stock reed cages must be used.
  • Lower unit: Must remain stock as produced by the manufacturer, any OEM gear ratio allowed.
  • Optional water pump plate (mercury part number 8M0168838) is allowed.
  • The center section/mid-section for the 300xs only may be converted to the Mad EFI 15″ offshore (3L top to 3L bottom).
  • The exhaust system must remain stock, but the “Muffler” must be cut off to fit inside the 15″ center section.
  • RPM is limited to 6500 RPM.
  • A G2X Pro Data Logger or AIM must be installed to monitor RPM levels during the race.
  • The wiring harness of the system must be readily accessible for inspection.
  • All propellers must be approved by APBA before and after use during an approved official race.
  • Propellers must be cast stainless steel; forged or titanium propellers are not allowed.
  • Approved propeller manufacturers are Mercury, Hydromotive, Dewald, Herring, and Chopper Perf.
  • External hydraulic steering is required.
  • Remote Water pickups are not allowed.
  • A water balance tube to connect water cooling systems between engines is permitted, with all plumbing external from the hull.
  • Only petroleum-based fuels are allowed; octane enhancing and oxygen enhancing additives are not allowed.
  • Tunnel tabs: Only fixed tunnel tabs are permitted.
  • All Super Stock boats built after May 1st, 2022, must meet or exceed the latest Lavin/UIM safety cockpit construction standards.
  • All Super Stock boats built before May 1st, 2022, must conform to the UIM/Lavin Standards before the 2023 season.
  • Adjustable Motor Brackets: Jack plates must not be movable while the boat is under power racing.
Boat Specs
  • Boats must be 28′ to 32′ catamarans.
  • The minimum weight requirement is 4900 lbs.
  • The maximum tunnel width is 63″.
  • For boats built before May 1st, 2022, retrofitting to the Lavin/UIM Standards is mandatory.
  • No external wings, air foils (fixed or adjustable), or movable deck surfaces are allowed.
  • All ballast must be securely fixed and not adjustable while racing.
Engine Specs (Twin engines)
  • Approved Engine: Mercury 300xs, 2006-current, 300 hp, 3.2L (193 CID) with Sportmaster lower unit.
  • Cowlings: Lightweight facsimiles of the production cowling are allowed, with manufacturer decals.
  • Powerhead: Must remain stock as produced by the manufacturer.
  • Balancing and Blueprinting are not allowed.
  • Compression ratio: May not be altered.
  • ECU boxes: May not be modified or reprogrammed, maximum RPM allowed is 6500.
  • Flywheels: No modifications or lightening is allowed.
  • Reeds: Any reeds are allowed, but stock reed cages must be used.
  • Lower unit: Must remain stock as produced by the manufacturer, any OEM gear ratio allowed.
  • Optional water pump plate (mercury part number 8M0168838) is allowed.
  • The center section/mid-section for the 300xs only may be converted to the Mad EFI 15″ offshore (3L top to 3L bottom).
  • The exhaust system must remain stock, but the “Muffler” must be cut off to fit inside the 15″ center section.
Rev Limiter
  • RPM is limited to 6500 RPM.
  • A G2X Pro Data Logger or AIM must be installed to monitor RPM levels during the race.
  • The wiring harness of the system must be readily accessible for inspection.
Propellers
  • All propellers must be approved by APBA before and after use during an approved official race.
  • Propellers must be cast stainless steel; forged or titanium propellers are not allowed.
  • Approved propeller manufacturers are Mercury, Hydromotive, Dewald, Herring, and Chopper Perf.
Accessories
  • External hydraulic steering is required.
  • Remote Water pickups are not allowed.
  • A water balance tube to connect water cooling systems between engines is permitted, with all plumbing external from the hull.
  • Only petroleum-based fuels are allowed; octane enhancing and oxygen enhancing additives are not allowed.
  • Tunnel tabs: Only fixed tunnel tabs are permitted.
Safety
  • All Super Stock boats built after May 1st, 2022, must meet or exceed the latest Lavin/UIM safety cockpit construction standards.
  • All Super Stock boats built before May 1st, 2022, must conform to the UIM/Lavin Standards before the 2023 season.
  • Adjustable Motor Brackets: Jack plates must not be movable while the boat is under power racing.
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