Part number on the head is the head casting number. Part number on the box is the machined head assembly that GM sold as a service part. Generally, GM did not sell bare castings so, technically, you could never buy an unmachined 3946074 head. GM used part numbers to track parts internally, not just in vehicle assembly or service. Many part numbers used for internal control were never sold in service.
Service Parts frequently remained in production long after the original application went away.
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Fred Aldrich
Web Site: www.GeoCities.com/~69_chevelle
[This message has been edited by Fred Aldrich (edited 04-01-99).]
Service Parts frequently remained in production long after the original application went away.
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Fred Aldrich
Web Site: www.GeoCities.com/~69_chevelle
[This message has been edited by Fred Aldrich (edited 04-01-99).]
