440 Block codes

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gary
GTX (RS)
Posts: 272
Joined: Mon Aug 24, 2009 10:10 pm
My Cars: '71 GTX Gold Leaf Met.440 A/T

440 Block codes

Post by gary » Sat Mar 23, 2013 1:09 am

I have 4006630-440-7 stamped on my block what does the "7"stand for?
It has 452 heads W/small Tapered spark plugs.Date Stamp of 3-17-76 What do i have? :beer:
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moparite
GTX (RS)
Posts: 238
Joined: Tue Apr 21, 2009 8:27 am
My Cars: 1971 Road Runner 4speed FJ6 air grabber car. And yes i have the
build sheet to prove it. NO IT'S NOT FOR SALE!
Location: South Jersey

Re: 440 Block codes

Post by moparite » Sat Mar 23, 2013 12:01 pm

I believe it's a date code. 7= 1977. That casting was used from 75-79. The 452 casting #4006452 used between 76-78 400 and 440's 2.08 intake and 1.74 exhaust valve.
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