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Old 11-07-2008, 05:23 PM
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Cobra Make, Engine: 1969 Mustang Fastback Pro-Street, constantly changing ongoing project!
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[quote= I did see some advertised engines on ebay claiming to be 428 or 428 stroker and they were made from a seasoned 390 block. Prices seemed quite reasonable. I may be in need and wanted to know to stay clear or not. Staying clear.

John[/QUOTE]

Hi John, I think most of the 428 strokers from a 390 block advertised on ebay are done by the length of the stroke & not by over-boreing them. Rotating assemblies (cranks) from Scat, Eagle, etc give a longer stroke, hence the increase from 390 to 428 cubes. I think the most a 390 will take is a .60 overbore. I'm not a builder of FEs but am an enthusiast who has owned many of them. They are my favorites. So yes, I would be leary of an overbored 390 advertised as a 428 but a proper stroker with a safe bore size & stroker crank is fine.
Just my .02 cents

Regards,
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