Wow. Those are W2 flow numbers from a P-car head. Pretty good. How many hours you got in them?
Those are good numbers but not W2 numbers. Also, a W2 flowing 290 CFM will make way more HP than a Pcar head flowing the same. Don't get caught up in the numbers.
That said, you need to figure out how to NET .650-.660 lift and that will be almost impossible with standard length valves. If you install longer valves, you will be hard pressed to get the geometry back in shape.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
