Ferrea Competition Plus Exhaust Valves - SB Chevy - 11/32" Stem, 1.600" Head Size, 4.960" Overall Length - 12 Super Flo. (Super Alloy). Stk/+.050 - (Set of 8) 36004R In order to achieve a

In order to achieve a flatter flow curve

Provides ample clearance for a thermostat

1955-1960 GMC Truck

357 cc Intake

Ferrea Competition Plus Exhaust Valves - SB Chevy - 11/32" Stem, 1.600" Head Size, 4.960" Overall Length - 12 Super Flo. (Super Alloy). Stk/+.050 - (Set of 8) 36004R In order to achieve aFerrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. We, at Ferrea, are dedicated to providing the absolute best product on the market. Our extensive R & D programs provide tehcnological gains, which are implemented in each of our competiton plus valves. They are engineered for higt rpm, high horsepower racing engines, and are chose by many top NASCAR, Drag, and Oval & Sprint Car racing teams. To