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Old 11-23-2006, 09:50 PM
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It must have a '70 or later Cleveland engine instead of the 351W that came in '69. I've never seen them on a set of Windsor heads., they usually are too restricted already. BUT.. it was and still is a common practice on Cleveland heads to help speed up flow because the lower part of the port slows the flow and creates a deficiency. The "power plates" were not around originally.. they used to mill the edge of the head/exhaust port off and put machined aluminum plates on it that were held by the outer head bolts and then port them together. It was always a port about half the size of the factory port and higher, increasing flow enormously and was standard fare in Pro Stock for many years. It was an expensive procedure for the average guy and stainless exhaust "power plates" were developed with a tongue that goes into the port effectively changing the size and giving some of the benefits of more expensive aluminum port plates with no machining. I think there are more than one made now and not all are stainless.
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