Pro-formance Unlimited .Com

Building And Designing Engines Since "1978"

Toll Free: 1-800-267-3940 International +1-732-462-7283

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We hand assemble these heads using Stainless Steel Valves , High Performance Springs, Retainers, Keeper, Screw In Studs, And Guide Plates. As we check each valve for proper spring pressure And installed height . To ensure no coil binding and valve floating when reaching high RPM.

On Our 350HP, 375HP, And 390HP Engines We Use A 176cc Intake Runner And 64cc Combustion Chamber.

While On Our 400HP+ Engines We Use 180cc Intake Runner And 64cc Combustion Chamber.

Flow Data Tested @28" Of Water

.100

Int./Exh.

.200

Int./Exh.

.300

Int./Exh.

.400

Int./Exh.

.500

Int./Exh.

.600

Int./Exh.

.700

Int./Exh.

73/57 150/100 206/156 242/176 257/186 263/190 270/194