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  MBPA 2007 CLASSES  
 
750 lb-12 HP and under Stock, Tire size 23x10.5x12 or smaller (Kids 12 and under)

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 12 hp Block **  
** Inserts on Stock Rod are allowed **
** Chevrolet Points are allowed ** 
** 26 mm Carburetor with Choke **
** Stock Valves, Keepers, Retainers & Springs **
** Stock Flywheel with NO fins removed **
 

 

850 lb-12 HP and under Stock, Tire size 26x12x12 or smaller. (Kids 16 and under)

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 12 hp Block **  
** Inserts on Stock Rod are allowed **
** Chevrolet Points are allowed ** 
** 26 mm Carburetor with Choke **
** Stock Valves, Keepers, Retainers & Springs **
** Stock Flywheel with NO fins removed **
 

 

850 lb-8 HP and under Stock, Tire size 23x10.5x12 or smaller

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 8 hp Block **  
** Inserts on Stock Rod are allowed **
** Chevrolet Points are allowed ** 
** 26 mm Carburetor with Choke **
** Stock Valves, Keepers, Retainers & Springs **
** Stock Flywheel with NO fins removed **
 

 

900 lb-12 HP and under Stock, (Belt Drive ONLY) Tire size 26x12x12 or smaller

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 12 hp Block **  
** Inserts on Stock Rod are allowed **
** Chevrolet Points are allowed ** 
** 26 mm Carburetor with Choke **
** Stock Valves, Keepers, Retainers & Springs **
** Stock Flywheel with NO fins removed **
 

 

900 lb-12 HP and under Stock, Tire size 23x10.5x12or smaller

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 12 hp Block **  
** Inserts on Stock Rod are allowed **
** Chevrolet Points are allowed ** 
** 26 mm Carburetor with Choke **
** Stock Valves, Keepers, Retainers & Springs **
** Stock Flywheel with NO fins removed **
 

 

950 lb-12 HP and under Stock, Tire size 26x12x12 or smaller  Powder Puff (ladies only)

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 12 hp Block **  
** Inserts on Stock Rod are allowed **
** Chevrolet Points are allowed ** 
** 26 mm Carburetor with Choke **
** Stock Valves, Keepers, Retainers & Springs **
** Stock Flywheel with NO fins removed **
 

 

950 lb-12 HP and under Stock, Tire size 26x12x12 or smaller

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 12 hp Block **  
** Inserts on Stock Rod are allowed **
** Chevrolet Points are allowed ** 
** 26 mm Carburetor with Choke **
** Stock Valves, Keepers, Retainers & Springs **
** Stock Flywheel with NO fins removed **
 

 

950 lb-18 HP and under Stock Twin Cylinder ONLY, Tire size 26x12x12 or smaller

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 18 hp Block **  
** Inserts on Stock Rod are allowed **
** Chevrolet Points are allowed ** 
** 26 mm Carburetor with Choke **
** Stock Valves, Keepers, Retainers & Springs **
** Stock Flywheel with NO fins removed **
 

 

950 lb-12 HP and under Stock II, Tire size 26x12x12 or smaller

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 12 hp Block with max 324 Lift ** 
** Inserts on Stock Rod are allowed **
** After Market Rod ( Stock Length) ** 
** Chevrolet Points are allowed **
** Any Carburetor ** 
** Stock Valves & Springs ** 
** After Market Keepers & Retainers **
** Steel Flywheel **  
( Motor & Flywheel Shields Required )
 

 

1000 lb-16 HP and under Stock II (Single Cylinder), Tire size 26x12x12 or smaller

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 16 hp Block with max 324 Lift ** 
** Inserts on Stock Rod are allowed **
** After Market Rod ( Stock Length) ** 
** Chevrolet Points are allowed **
** Any Carburetor ** 
** Stock Valves & Springs ** 
** After Market Keepers & Retainers **
** Steel Flywheel **  
( Motor & Flywheel Shields Required )
 

 

1000 lb-20 HP and under Stock II (Twin or Single Cylinder), Tire size 26x12x12 or smaller

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Stock Head, Shaving Allowed **
** Stock Cam for 20 hp Block with max 324 Lift ** 
** Inserts on Stock Rod are allowed **
** After Market Rod ( Stock Length) ** 
** Chevrolet Points are allowed **
** Any Carburetor ** 
** Stock Valves & Springs ** 
** After Market Keepers & Retainers **
** Steel Flywheel **  
( Motor & Flywheel Shields Required )
 

 

FLOATER CLASSES

(Classes will be added IF there are 4 or more tractors present)

950 lb- 12 HP and under-Stock altered II, Tire size 26x12x12 or smaller 

What you are allowed to do:

** Bore 30 thousands over (.030) **
** Milling, Decking, Porting & Polishing Allowed **
** Any Camshaft at Stock Location ** 
** Stock Stroke **  
** After Market Rod ( Stock Length) ** 
** Chevrolet Points are allowed **
** Any Carburetor no Larger than 1.200 **
** Stock Valves Size **
** After Market Keepers & Retainers **
** Steel Flywheel **  
( Motor & Flywheel Shields Required )
 

 

1050 lb-62 CI Stock altered II,, Tire size 26x12x12 or smaller

What you are allowed to do:

** Single Engine ONLY Gas or Alcohol **
** Engine Requirements Same as above **
** Motor Scatter Shield Required ** 
** Clutch & Flywheel Shields Required ** 
** Weight Bracket not to exceed 8 feet forward from the center of the rear axel **
 

 

 

M.B.P.A. RESERVES THE RIGHT TO ELIMINATE OR ADD TO THESE CLASSES IN CASES WHERE TIME IS LIMITED.