07-04-2006, 02:42 PM
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CC Member
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Join Date: Oct 2002
Location: Fairfield,
CT
Cobra Make, Engine: HM-2027 / 427 SO
Posts: 817
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Not Ranked
The C8 tag is the original Ford service part number. The D3 tag denotes it's a 73 service block. The 6010 is the number for a bare block only. 6015 is a production block used in a car,truck etc... You are right that many service blocks have no casting numbers. As long as you can id the block in person to verify it's a NOS sideoiler you should be fine. I'm sure the block is a pretty penny. Some service castings have been known to have some issues so you might want to have a competent shop check it out. There might be a reason the block is still NOS. But it also could be fine you just never know and better to be safe.
G.
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