Detonation on 408 Stroker

Cam CompCams 20-232-4 Hydraulic-Use in 340-360 Street Machine. Dual exhaust, 3.53-3.91 gear, 9:1 compression. Headers & aftermarket intake, 2500 stall. .480 / .480 Lift – Hydraulic 230 / 230 Duration @ .050 280 / 280 advertised
The compression is what the builder gave me on collection so presume it was measured during build time.
It isn't burning oil
I will back the timing off a touch this weekend
In neutral, RPM is about 950
Heads specs:
Heads Mopar Performance Heads 4772576MP Or P4529269 360 hp Head
Valves Mancini Racing Stainless Valve Set SEV-2678SG 1.60” Exhaust / 2.02 Intake
Thanks
Kev

Well there you go. Iron heads lots of compression and a tiny camshaft. You're going to have to physically change something to fix your problem. The DCR is too high.