Jim,
With that cam, you should be able to see 5k rpm. It may start dropping power output by then. One thing to consider, The lower end will take 5K rpm no problem. I would be more worried about valve float if it were a v8. But one unique thing with the chevy chamber shape will allow valve float without damage, to a point. The valves sit almost 1/2" above the edge of head in the chamber, very hard to hit a valve.
The 292 dyno mule revved to 5400 rpm with no complaints and that was with a duration of 214 @.050. So the little 250 should also easily see 5K rpm comfortably.
Get some videos of it. How does it idle?
What is the WOT timing set at? Tom
