Editing SBC cylinder head identification (section)
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==Vortec L30 5.0L 305 head casting number 12558059== {| |[[File:L31 305 VORTEC HEAD CASTING ID.jpg|thumb|left|390px|305 Vortec L30 casting ID]] |[[file:305_VORTEC_SWIRL_RAMP_CN_059.jpg|thumb|right|180px|305 Vortec L30 intake port swirl vane]]<br style="clear:both"/> |}
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