Editing Vortec L31 cylinder head (section)
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===Other springs=== The following valve springs are single w/either no damper or damper removed. They fit the stock seat, guide boss, seal, and retainer unless otherwise noted. *Comp p/n 981 *Crane p/n 99846: H-11 tool steel *Crane p/n 144845: Performance hydraulic roller cams, PAC enhanced wire, no damper **OD: 1.265" **ID: 0.865" **Seat pressure: 120 lbs @ 1.750" **Open pressure: 358 lbs @ 1.250" **Coil bind: 1.100" **Rate: 476 lbs/in. **Max net lift: 0.600" *Isky p/n 205D *Lunati p/n 73943 *Manley p/n 22410, fit without machining, allow 0.520" lift **Seat pressure: 125 lbs **Open pressure: 340 lbs @ 0.500" lift **Retainer p/n 23652 {{Note1}} K Motion K-700 springs have been reported by one member of Hotrodders.com to be breakage prone. Another member (this writer) has had several sets of 1.25" OD single springs with damper (p/n unknown) break the dampers on a 0.480" net lift hydraulic cam SBC application. Whether these problems were transient or ongoing is unknown. If these springs are being considered, research them first.
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