Accepted S/SS Cylinder Head Volumes

HawkBrosMav · 09-06-2019, 04:54 PM

Wondering how a cylinder head gets treated if it is listed on a "Blueprint Spec Sheet" but not list on the "Accepted Products Sheet" with a correlating volume?

The obvious, current events, example would be the D7OE-DA cylinder head for a 1977 Ford 302.. ONLY D7 head listed is D7EE-CB..

Dissecting this part # would be 1977 "Unknown E" "Engine Part" -CB(revision/tooling #)

D7OE-DA not listed.. Common sense says that the -DA version would be accepted at the same volumes as the -CB, but then again wouldn't one assume the -CB is legal than? Or if in fact the -CB was deemed illegal why not change the "Accepted Products Sheet" to match the newly deemed legal -DA version..

In a similar situation until recently for the 88-95 Ford 302 in a Mustang-- E7TE-PA and F1ZZ-B have been listed as legal.. Recently the F1ZZ-B number (which is only a book number not a cast number) was updated to read F1ZE-B which would be the number cast on the head.. "1991" "Mustang" "Engine part"... "Accepted Products Sheet" lists only "E7TE" no mention of the -PA (no other suffix exists so this isn't a huge problem), but no mention of this F1Z(ZE)-B.. there is a F1ZE-AA (which is an entirely different head and has different volumes listed from the E7 version) again common sense would say the -B head is legal at the E7 volumes but why not list it?

I'm sure there are many more examples of this.... maybe there isn't.. I'm just familiar with these two so I'm able to elaborate on them a bit, but during a tear down what does NHRA do in this situation?

Brad

09-06-2019, 04:54 PM	#1
HawkBrosMav Member Join Date: Apr 2009 Posts: 362 Likes: 6 Liked 302 Times in 73 Posts	Accepted S/SS Cylinder Head Volumes Wondering how a cylinder head gets treated if it is listed on a "Blueprint Spec Sheet" but not list on the "Accepted Products Sheet" with a correlating volume? The obvious, current events, example would be the D7OE-DA cylinder head for a 1977 Ford 302.. ONLY D7 head listed is D7EE-CB.. Dissecting this part # would be 1977 "Unknown E" "Engine Part" -CB(revision/tooling #) D7OE-DA not listed.. Common sense says that the -DA version would be accepted at the same volumes as the -CB, but then again wouldn't one assume the -CB is legal than? Or if in fact the -CB was deemed illegal why not change the "Accepted Products Sheet" to match the newly deemed legal -DA version.. In a similar situation until recently for the 88-95 Ford 302 in a Mustang-- E7TE-PA and F1ZZ-B have been listed as legal.. Recently the F1ZZ-B number (which is only a book number not a cast number) was updated to read F1ZE-B which would be the number cast on the head.. "1991" "Mustang" "Engine part"... "Accepted Products Sheet" lists only "E7TE" no mention of the -PA (no other suffix exists so this isn't a huge problem), but no mention of this F1Z(ZE)-B.. there is a F1ZE-AA (which is an entirely different head and has different volumes listed from the E7 version) again common sense would say the -B head is legal at the E7 volumes but why not list it? I'm sure there are many more examples of this.... maybe there isn't.. I'm just familiar with these two so I'm able to elaborate on them a bit, but during a tear down what does NHRA do in this situation? Brad