Editing SBC cylinder head identification (section)
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==Casting numbers== Located under the valve covers, the casting number is the best way to ID a SBC head. The number along with the date code can be used to pinpoint the heads original application fairly closely. Valve sizes (1.94" intake x 1.5" exhaust or 2.02" intake x 1.60" exhaust) and whether or not screw-in studs and guideplates are in place can further ID them. Be aware that screw-in studs/guideplates were not used on all, or even most, large valve SBC performance heads from the factory, and if present, they could very well have been added previously. Click [[Cylinder head identification#Resources|'''HERE''']] for sites with information on casting numbers.
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