5 HP BRIGGS BLOCK MAX BORE. .035 OVER BORE MAY BE LARGER BUT THE PISTON CAN NOT…

STOCK 5HP FLATHEAD CRANKSHAFT. NO AFTERMARKETS.

STOCK BRIGGS VALVES AND SEATS. MAY HAVE MULTIPLE ANGLE VALVE JOB.

RAPTOR 3 OR OLDER PISTON.WEISCO SUPERSTOCK PISTON OK (1970 SERIES). MAX .+.035 OVER.

STOCK 5HP CAST IRON FLYWHEEL UNALTERED.

STOCK LENGTH ROD OF CHOICE.

ANY .233 RUNNING LIFT CAMSHAFT.

STOCK APPEARING HEAD . SPARK PLUG MUST REMAIN IN THE ORIGINAL POSTION.

STOCK APPEARING CARB WITH A BORE NO LARGER THAN .750. NO FUN POWER CARBS.

STOCK OR SINGLE PLATE BREATHER. NO ARC BREATHERS.

NO CARB CONES IN THE PLATE CLASSES.

THESE ARE SIMPLE RULES SO LETS KEEP IT FAIR

AND HAVE SOME FUN…