Plain and simple? You will need a dished piston to get the compression ratio low enough to work with a cam small enough to still use the factory fuel injection.
You will need the dished pistons. The 8.4 dynamic was from a 9.45 static compression provided by the 18cc dish. If you start with 10.5 static your dynamic will be way too high. Your cam is intended for the 9.5 static, max. With the 9.45 static it will run on 89 octane.thebigblue said:Really appreciate the input. I'm looking for torque down in the low and mid rpm's. Peak numbers are not the point in this build. I would prefer 89 octane but 91 would work to I guess. So, 10.5 CR static and 8.4 CR Dynamic then? anything about advancing or retartding cam timing play into this? If so, how? Would it be worth another $150 to get deeper dished pistons to increase volume and decrease CR? what CR is a cam like mine intended for?