when my e7te heads took a shit i had some d20e heads laying around. im wondering if they need replaced when i do my new engine. replaced meaning with an aftermarket aluminum cylinder head. the specs on them are 58.2cc chambers 1.94 intake valves and 1.62 exhaust. upgraded springs and ported exhaust with cleaned up intake. some people have told me that these will support 400hp. i call bs on that but wanted some input. i cant post in tech for some reason anymore so this is what i got.