Proposed APBA Classes for the 1997-1999 Seasons

October 24, 1995

Open UIM - I
Class Designation - Numbers Only 

Min.	Engine		Engine		Number		Engine		Hull 
Length	Type		Category	Engines		Size		Type
38'48'	Inboard		Race		Twin		1000 CID	Cat - Vee
9500lb min.

Modified
Class Designation - M 
Min.	Engine		Engine		Number		Engine		Hull 
Length	Type		Category	Engines		Size		Type
30'-40'	Inboard		Modified	Twin		1020 CID	Cat

Pro-Stock
Class Designation - P 
Min.	Engine		Engine		Number		Engine		Hull 
Length	Type		Category	Engines		Size		Type
30'-37'	Outboard	Performance	Triple		560 CID		Cat

Super-Stock
Class Designation - S 
Min.	Engine		Engine		Number		Engine		Hull 
Length	Type		Category	Engines		Size		Type
28'32'	Outboard	Stock		Twin		375 CID		Cat

Mfg. Vee
Class Designation - V 
Min.	Engine		Engine		Number		Engine		Hull 
Length	Type		Category	Engines		Size		Type
36'-47'	Inboard		Race		Twin		1300 CID	Vee
36'-47'	Inboard		Supercharged	Twin		1100 CID	Vee
36'-47'	Inboard		Turbocharged	Twin		1100 CID	Vee

Sportsman
Class Designation - B 
Min.	Engine		Engine		Number		Engine		Hull 
Length	Type		Category	Engines		Size		Type
30'-39'	Inboard		Production	Twin		1020 CID	Vee
30'-39'	Outboard	Performance	Twin		1020 CID	Vee

Production
Class Designation - A 
Min.	Engine		Engine		Number		Engine		Hull 
Length	Type		Category	Engines		Size		Type
24'-32'	Inboard		Production	Single		510 CID		Vee
24'-32'	Inboard		Modified	Single		470 CID		Vee
24'-32'	Outboard	Performance	Twin		375 CID		Vee

General:

  • No turbo or supercharger except Mfg. Vee
  • No multi speed transmissions, no diesels
  • Boats not meeting thses requirements will be grandfathered on an individual basis
    Modified Cat: Compression ratio 9.5:1
    Performance: Factory modified outboard, no modifications to OEM specs
    Modified 470 CID: Class A No "Big Chief" heads allowed.
    Production 510 CID: Class A
  • Fabricated 15.5" headers.
  • 10.5:1 compression
  • Cast single plane intake manifold
  • Any single four barrel carburetor
    Open Class:
  • 6800 RPM limit
  • Compression ratio

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