The best in the business!
If you’re looking for TOP NOTCH components for your heads, look no further. GSC Power Division makes superior products that you can trust. When you’re looking to make serious power in a Subaru, +1 valves are the way to go, especially with the addition of a bigger cam. By adding GSC’s valve stem guides and viton seals, you also get better airflow and a sure fire seal. If you’ve got your engine out, or are building, just do it.