Part details & fitment
Our Steel Spring Seats pocket the inner spring of our Aasco High Performance Valve Springs. Our Valve Springs are designed and manufactured to specifically fit the envelope of a Porsche application not a spring from another use. It operates a higher natural frequency than the original spring for racing and at the very least minimizes damage from over rev in track day situations. 911, 914, 930, *993-required with use of 8mm Ti retainers.
*Not an OE replacement, requires use of HP109-KIT valve spring kit.