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A stroker motor is a wonderful thing. It yields more torque and generally more horsepower all things being equal. It certainly isn't something you need to do to a 427 to get it to perform and some will argue, correctly, you will actually hurt the overall performance of a 427 and it's ability to rev by stroking it. But how often do you intend to take it to 7,000 rpm??
If I had a choice of brand new parts, 427 steel crank verses a 428 steel crank, I'd take the 427 crank. However, with 427 steel cranks being 40 years old and getting hard to find in good shape a 428 steel crank makes economic sense. Of course they are externally balanced and require 428 rods and a flywheel as well.
Other considerations are the vehicle you intend to put it in. If I were building an engine for a 3500 pound car rather than a cobra I would be more inclined to use a 428 crank (which I am considering for my next project)
In either case you have made a good choice. There has never been a better time to build an FE, that is enless you were at the Holman & Moody garage sales back in the day.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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