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McKinney says the 2V engines have the potential to be great performers, "They just need more compression and better cams. These engines love compression." He recommends at least 10.4:1, and it turns out the hot ticket is to start with an NPI block. To accommodate the smaller combustion chambers of the PI heads, Ford equipped the '99-and-later engines with dished pistons that put the compression ratio at 9.4:1. Dropping PI heads on an NPI block will yield his recommended 10.4:1 compression ratio.