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Boss 351 cylinder head info....
#1
Hello.I have a set of 351 Cleveland 4 bbl heads that I need to identify.The casting # is D1ZE.They have pushrod guideplates and screw in rocker arm studs.They still have Ford script valves and the ports etc are unmolested.According to several websites,it sounds like I might have a set of 1971 Boss 351 heads,but not sure.I am going to sell them and am looking for any advice as to their worth.They currently have surface rust..If they're worth much I will probably beadblast and have them magnafluxed,although they came off a running motor.[Yeah,a 2V short block]
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#2
Need more of the casting number I think. You can try http://www.mustangtek.com/heads/Heads.html to get a better idea of what you have. Post back here since someone may be interested.

Wisdom, knowledge and intelligence are three very different things.
1971 convertible, H-code, Ram Air
1971 Mach I, M-code, Ram Air
1987 Bronco II
2014 F150 Supercrew
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#3
71 Boss 351 heads carry the D1ZE-B casting number
71-72 351CJ are D1ZE-DA

Boss heads should also have single groove valve keepers and closed chambers. The 351CJ will have the 4 groove keeper and open chambers.

No matter what, toss the Ford valves as far from a running engine as possible, since they have a nasty habit of losing a head at high rpms and destroying the engine.


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#4
Boss 351C heads are D1ZE-B, the two other heads with the same basic number are D1ZE-DA and D1ZE-GA. You'll also need to get the alpha suffix. If they are -DA or -GA heads you'll also need to get the date codes to identify what you have.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#5
Yes under one of the two middle intake ports there is a D1Ze cast in.Under the other middle intake port there is a larger DA underlined.The only other casting mark i found was a circle marked 1 3 5 7 9.[Besides a couple of "4"s with a dot and a F inside a circle.]The pushrod guideplates have a Ford C9 part # stamped on them.Sounds like I have a set of 351 CJ heads which arent that rare or desireable according to some of the 'net Cleveland gurus. I dumped myself,the hand cart and the head in a snowbank bringing it into the shop so I will let it and me dry and give it a better look over tomorrow.Thanks a bunch guys for the quick responses. ken
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#6
Yes, they are CJ heads, but at least have the large valves. Not as desirable as the Boss or closed chamber heads, but still can make a lot of power. They are also good for stroked engines for keeping the compression ratio under control. Already having adjustable valves is also a plus, not cheap getting them machined.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#7
For the future ...................much easier to start with the DATE CODE ! OEM Boss Heads have a very short run range OK4 to 1E7 (for the close chamber)

Mark
P.S. So SO MANY 1970 heads were "converted to studs" as a performance mod (from racing to the street) that DATE CODES are the best way to know if you have a $4000 set or a 400 hundred dollar set
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