grand national / sportsman division allows 3 different motors -
363 ci max 48lb crank, flat top pistons - stock steel prodution cylinder heads ( 882 993 441 461 487x 487 ) etc , flat tappet cam max .500 lift - victor jr intake
or
360 ci max 48lb crank, flat top pistons - 11:1 compression (sportsman2 heads) roller cam allowed but .500 max lift -victor jr intake
or
any motor over 365 ci must use stock prodution intake
( http://www.wismotorsports.net/files/2012gn.pdf ) is the rules page if i missed anything
WHICH IS THE MORE POPULAR COMBO TO GO WITH ????? i raced mods for 6 years and just venturing else were for ahile Thanks for any input
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