Proflow Engine Valley Cover Plate Gasket. Suitable for VT VX VY VZ Holden Commodore & HSV LS1 V8. Designed and engineered in-house, Proflow products are manufactured to the highest of standards. Proflow products are computationally optimized and tested within their own engineering department. Rapid prototypes are created to guarantee perfect fitment, as well as pleasing aesthetics. Proflow take pride in every part they make. Remember, Proflow are the leaders in performance products! Proflow’s engine valley cover gaskets are designed specifically for LS motors. They are made of a durable rubber and steel ribbed construction for long lasting performance. Give your motor the long lasting performance and durability it deserves with quality Proflow engine valley cover gaskets. Made of a durable rubber and steel ribbed construction for long lasting performance.