XE285HL in 360

If you are using 'that' to calculate the Dyn Comp Ratio as a means of selecting the static comp ratio, DCR is absolutely useless. It takes no account of how much air mass actually enters the cyl because IVC on it's own does not reflect:
- actual port flow efficiency
- the type of int man & efficiently it flows
- & how well the exh system scavenges.
These all have an impact on the net mass of air drawn into the cyl.

If you are going to run our 98 octane & 10.8:1 static CR, there is a good chance you will get detonation with alum heads & almost guaranteed with iron heads.