As found in APBA OPC 2022 Rulebook Rule 19.6

Motor Standards

1) 49.99 cu. In. engines must be visually stock production and mass marketed class E (49.99 cu.in. max. total piston displacement). An overbore of up to .040 is allowed. Internal modifications are allowed, so long as externally the powerhead appears stock.

2) 56 cu. In. engines must meet SST60 powerhead rules with the following exceptions:

a) Any 56 cu in block may be ground to specs (no aluminum but for glue line)

b) Any Stock 3 cyl crank is acceptable

c) Over bore to .040 is acceptable

d) Any brand of piston, so long as it meets SST60 spec.

e) Any reed material, must have reed stops

f) Any tuner/adapter (on 20” midsection)

g) Any cylinder head so long as it meets spec.

3) Power trim is not allowed. Engines with factory power trim must be operable at the transom only, or disconnected. In addition, all engines must be tied down to prevent kick-up.

4) Thrust jacks and upper mount snubbers are allowed. (No solid mounts allowed.)

5) Engine Modifications:

a) Tilt switches, oil injection and rev limiters may be rendered inoperative.

b) Two 1-inch diameter holes can be drilled in the lower unit above the cavitation plates (readily plugged for testing and water skiing).

c) Cosmetic appearance may be changed.

6) Propellers - any through hub allowed.

7) Engines must be mounted such that when trim parallel to running surface, the center line of the propeller shaft is located 5 inches below the running surface.

8) 20-inch midsection only is allowed.

Boat Standards

1) Boats must be molded V-bottoms.

2) Capsule and roll cages are allowed. Boats with less than 20” of molded depth at the driver’s seat must have a roll cage per APBA Super Sport class specs.

3) Driver’s seat must not be more than 36” aft of midships.

4) Steering: Mechanical push/pull (Ride Guide style) or Cable and Pulley Steering is allowed per APBA OPC standards.