Snowman,
I agree, your gearing does not sound like what you think it is. Here is a gear trans calculator. It is in Excel. Simply input
tire choice
trans choice
It will show you either a table or a graph.
http://www.12bolt.com/gearing_calculatorIf you do not like the rpm's, either a bigger tire can be used or go to a OD trans.
The redline of your 250 relies on a # of things. The stock engines biggest crutch is the 40 year old valve springs. They must be able to keep upto the task, if not than bad things start to happen. As is the stock lower end should withstand 5K rpm just fine. You cam and intake/ exh (as Sam said) is the limiting factor now. Tom
