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Message: <blockquote data-quote="Anrev" data-source="post: 269924" data-attributes="member: 9158">Found this on another forum."Ford just came out with the Z304 head it will take 2.02/1.60 valves. There is a write up on them in Muscle mustangs and fast ford's july issue. The article quoted "The ford racing Z304 heads are worth a solid 50 HP over the smaller GT-40X heads. Note that the Z304 heads offered a power improvement across the board, a sure sign the GT40X heads were restricting the 392 crate motor." It also states that they flow 275 CFM as the GT40X flow 240 CFM max."I have GT40X heads. One day I plan to have them ported to see if I can get closer to those Z numbers.</blockquote>