Ski Comp. (NDBA)

Organization: 

Ski Comp. class in the NDBA

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Ski Modified (NDBA)

Organization: 

NDBA Ski Modified class.

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K Boat (NRKA)

Organization: 

Blown alcohol circle flats.

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Pro Eliminator (ADBA)

Organization: 
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E Boat (APBA)

Organization: 

E Boats had a 331 ci limit. Hulls used for this class were typically very small; 14 to 16 feet were common.

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Ski Kilo (SK) (APBA)

Organization: 

SK Racing Runabout was a flatbottom class in the APBA. It had a 400CI limit, carburetors on gasoline only. Boats had to have seating for 2, be at least 16 feet long and weigh 1500 pounds. Until 1967 they had to have fixed cavitation plates.

It was eventually combined with Pro Comp (PC) to form the Pro Stock (PS) class in 1988.

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Top Fuel Hydro (LODBRA)

Organization: 

Blown Alcohol Displacement (APBA)

Organization: 

Australian B.A.D. boats!

Blown Gas Hydro (NDBA)

Organization: 

Grand National (GNRA)

Organization: 

Grand National Specifications

Length: 25 feet maximum

Weight: No Minimum (average approx. 2500 lbs.)

Hull: Mono Hull - vee / flatbottom

Propulsion: American-made automotive engine mounted to rear of amidships and driving forward through a v-drive to a stationary strut mounted propeller.
Gearboxes are permitted.

The GN Engine:
Block: Chevrolet Big Block, Chrysler B/ RB or Chrysler Hemi-based engines. Cast iron engine blocks only.

Cylinder Heads: OEM or aftermarket. Iron or aluminum with common wall intake ports.

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