Cylinder head dyno shoot out

I’d expect the heads to allow for power peaks to occur solidly above 6000.

Gotta be about 20 years ago now…….419ci, just under 12:1, easy on parts .630 lift roller, Victor 340, 1-7/8x3.5 hedman headers, ported RPM’s flowing 280:
544tq@4900
587hp@6400

Smaller headers may limit the peak rpm.