Manley 1.620 Dual Valve Springs - Polished 851001 Rated one of the bet

Rated one of the bet X-pipes for the money by 5

With minimal pressure drop it can be used for engine

340LPH @ 73 PSI (30 psi boost)

absolutely nothing is rebuilt

Manley 1.620 Dual Valve Springs - Polished 851001 Rated one of the betProduct Description: Valve Spring NexTek Dual Spring 500 lb in Spring Rate 1. 200 in Coil Bind 1. 620 in OD Polished Set of 16 Manley Performance high performance and racing engine parts have been powering winners since 1966. Since our inception in March 1966, Manley Performance Products has been at the forefront of the high performance automotive industry. Founded by gearhead Hank Manley shortly after his graduation from Brown University, our journey