could some one tell me i looked up this casting 3927186 and came up with a 64cc 2.02 intake and a 1.60 exhaust.but when i went and seen them thay wear a 1.94 and a 1.50 and was wondering if this casting did came with a 1.94 and 1.50.all i can find is thay only came with 2.02 and 1.60.any help would be appreciate.thanks len