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i have a 74 duster 318 just put new mopar performance valve covers on it. are breathers necessary? i have 1 hole drilled in the one for a pcv valve theres a spot to drill another hole to put a breather in but want to make sure it is necessary before i tear them off to drill another hole. thanks

1 have a 74 duster 318. was having starting problems when it got hot. tried carb spacer helped for a little while, swap valve covers from chrome steel to cast aluminum 2 weeks ago to help with heat. this morning went to start it now it wont start. never had this trouble before always fired after...