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Here are the official rules for modifying the engine:
B2.3 Engine Modifications
The base Briggs & Stratton engine may be modified in any manner that otherwise complies with these rules with the following exceptions.
B2.3.1 Cylinder & Crankcase
The cylinder and crankcase must be identifiable as components of the base engine supplied by Briggs & Stratton to the entrant.
B2.3.2 Crankshaft Support Bearings
The crankshaft support bearings (journals) may be altered or replaced but must be retained solely by the Briggs & Stratton crankcase.
B2.3.3 Piston Friction Surface
The piston friction surface may be altered or replaced but must be retained solely by the Briggs & Stratton crankcase.
NOTE: Encapsulating another manufacturer's engine within the Briggs & Stratton cylinder/crankcase assembly is in violation of these rules.
B2.3.4 Crankcase Ventilation
Crankcase cannot be ventilated to engine intake air.
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