Knowing these engines, I'd say 6500 RPM redline and most cams with 0.600" lift would likely work. That said, you are better off with a 0.550" cam and making power peak before 6000-6200 on the 225. Long stroke and small bore means lower RPM range for max power.

Lou

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Home of Slant6-powered fun machines since 1988

when i ran my 11 to 1 engine with a comp cam .540 lift the car ran its best shifted at 6500rpm and 6800rpm over the line

As long as you are running the new Wiseco piston, I would not be afraid to turn the motor 8,000 - 8,500 RPM. I bet a Slant would sound pretty good up there. Regarding piston to valve clearance, the valve pockets are .240" deep but due to cam timing etc. you should always check to make sure what clearance you have.

So after cutting to -20cc, is the piston top is still thick enough to handle boost? 500+hp?

This should subject for the rods and pistions should be a sticky.

Bumptibump for dished question.