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We just completed port development on the "Race Ready" package standard port Tiger head. For discussion purposes and the variations in flow bench data, the following information is the actual increase in CFM from the baseline head. The port CSA is about 2% larger, the goal was to improve mid lift airflow.

Intake lift / CFM Gain
.100 +5
.200 +12
.300 +11
.400 +11
.500 +21
.600 +21
.700 +26
.750 +33
.800 +19
.900 +15

Exhaust lift / CFM
.100 +22
.200 +20
.300 +22
.400 +28
.500 +29
.600 +18
.700 +19
.800 +21
.900 +22

The package uses the standard 2.250" intake valve, 1.800" exhaust valve in the standard valve location. Port velocity is increased to achieve strong low to mid lift numbers while keeping the port size to a minimum. I've attached port mold pictures below, the new port is the one on the right.

The cost for this upgrade is $1,485.00.

Calvin Hill
Hill Performance / Mondello Tech Center
708-250-7420 / 931-459-2760