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For the hard core Cleveland guys in the group...question: How can you tell if you have a Boss 351 cylinder head vs. a standard 4v if you do all the mods to give it the roller rockers, guide plates and cut the spring pockets for the valve spring???
I looked in my old Ford book and it shows that the Boss cylinder heads have a slightly larger combustion chamber, but no mention of part number and the like.
I would think it have to a be an early casting number...any ideas??
 

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I'm not a Cleveland expert, but looking in my High Perf Ford Engine Parts Interchange Manual, it shows a casting number of D1ZE-B for a BOSS 351 head. Check on the underside of the head for a casting #. John
 
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Boss 302 head casting numbers
C8VE - 1968(!) used in road track cars
C9ZE-A - 1969 63cc chamber
D0ZE-A - 1970 58cc
D1ZE-A - Service replacement Boss 302 58cc


1971 Boss 351 - D1ZE-B 64-67cc
1972 351 HO - D2ZE-A 73-76cc

70 351C-4V - D0AE-G,-H,-M,-N,-R 61-64cc
71 351C-4V - D1AE-GA 61-64cc
 
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It's all in the "Z" of the casting numbers.
 
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