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06-21-2024, 08:41 AM
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Registered User
 
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,045
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Re: SBC Cylinder Head Markings
Here is what my book shows for those casting marks;
3998991: 307 (69-73) and 350 (73-76) Truck light duty 1.71 intake valve, 1.50 exhaust valve 468642: 350 truck (71-85), Corvette (80-85), 400 truck (75-80) 1.71 intake valve, 1.50 exhaust valve
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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