Hobby Stock

hobby stock tech specs

As found in APBA OPC 2022 Rulebook Rule 19.6

Technical Standards

1) Max Total Cu. In. Displacement: 49.99

2) Min Boat Length: 13'

3) Min Boat Weight: 1050 lbs.

4) Minimum Age: 15 years


Boat Standards

1) Hulls must be molded passenger-type “V” bottom and have open cockpits regardless of seating arrangement

2) Boats with a molded depth of 20” must have a roll bar or safety cage.

3) Boats must have a minimum of 6 cu. ft. of flotation foam


Motor Standards

1) Engines must be OMC 3-cyclinder in original mass-marketed configuration regardless of cosmetic appearance (i.e. color or commercial identification).

2) Modifications to these 40-year old engines, and substitutions of aftermarket, as well as non-period correct parts, including ignition components are allowed, however, they must maintain an under the cowl visual stock appearance. Air boxes and VRO related parts may be removed. Two 1” diameter holes can be drilled into the lower unit above the cavitation plate to relieve exhaust pressure.

3) Engines must be mounted, when pitched parallel to the running surface, the propeller shaft center line is at least 5” below the running surface.

4) Engines must be restrained to prevent kick-up.

5) Engines equipped with power trim must be rigged in a manner that does not permit the driver to adjust the trim while underway.

6) Propellers must be through-the-hub exhaust type.