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Message: [QUOTE="smokinstroker92, post: 1078007, member: 3595"] The cfm numbers are going to be entirely dependent on the flow bench that is being used and the calibration on said flow bench. The bench used to flow these 7.3 heads will flow about 210 cfms while fully ported 12v heads around 220-230 at .600 lift and the hamilton 12v big valve fully ported heads flow high 200s. I have seen variations of 40-50 cfms on the same head on other flow benches. At the same time with a 12v head having intake ports feeding 5.9l or displacement and the 7.3s having 8 intake ports feeding 7.3ls. Each 12v port feeds .983L of displacement while the 7.3 ports are feeding .913L of displacement. So for instance on the same bench we have a fully ported 12v head flowing 230 and the fully ported 7.3 head flowing 210. 7.3l: 210cfms*8ports= 1680cfms total flow/7.3l= 230.14cfm/L 5.9l: 230cfms*6ports= 1380cfms total flow/5.9l= 233.89cfm/L To me this shows that the efficiency of each head is pretty close to the same per displacement and the # of cylinders. Now would the 7.3l still be limited by a 2.6 charger? I could agree with that because the flow from a 2.6 charger is not enough to reach the peak of the potential for the larger displacement motor that a 3.0 or twins in a superstock application may have. Now i may be off here on my thinking here whats your thoughts? And why the decreased stroke? yes that would bring displacement back down but it would also decrease the time @ tdc which i would also agree is critical to overall engine efficiency [/QUOTE]

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