PRO660 LS Cylinder head valve spring and retainer kit. Get ALL the parts for ALL the heads ALL in one box! Contains parts to complete many OE LS heads as well as PWHeads 63240, 69225, 68276, 68276R, 69255 & 69255R bare cylinder heads for hydraulic roller applications up to .660" lift. (check camshaft manufacturers specifications to confirm compatibility) Contains:  1.30" dual valve springs, OE locator/seals, aftermarket locators, retainers, locks and viton seals. Note: Shims may be required  - not included.

• Instructions

Valve Springs (16): 1.304" OD, 151# @ 1.80", 417# @ 1.15", 1.062" coil bind, 409# spring rate
Retainers (16): 8mm Moly 7 Degree
Valve Locks (32): 8mm 7 Degree
Valve Seal/Locator Combo (16): For OE style heads ONLY! Guide .552", .040" thick
Valve Spring Locators (16): .565" ID, .650" locator, .060" thick
Valve Seals (16): 8mm .502" Viton (for aftermarket heads)