Editing Vortec L31 cylinder head (section)
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==Technical specs== *Valve Spring Seat/Base diameters: 1.290” O.D., 0.852” I.D. *Valve Seals: Metal jacketed Viton positive type seals on both intake and exhaust *Valve Guide Diameter: ID- 11/32" (.343"), Guide OD AKA- Seal Provision: .552"-.555" *Combustion Chamber Volume: 64 cc *Heat Risers: No *Valve springs: Single .177" diameter wire, No Damper, 1.250” O.D., 0.896” I.D., 80-pound seat pressure @ 1.700” installed height, Open test load- 190 Lbs @ 1.270", Coil-bind @ 1.180”, vortec heads will not accept early SBC springs w/ damper. Max lift for stock spring is .460" w/ .060" distance before coil bind. *Max. Valve Lift: 0.460” which provides 0.030” retainer-to-seal clearance (average overall retainer to seal distance is: .490"-.500") *Rocker Arm Type: Self-Aligning *Intake Runner Volume: 170 cc *Valve Diameter: I: 1.94”, E: 1.50” *Casting Numbers: 10239906 and 12558062 *Rocker Stud: Press-in, 3/8” diameter *Spark plug: 14 mm, 3/4" reach, tapered seat
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