• 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Which type of 4V heads are this ?
#1
Hello,

My 4V Cleveland was an original 2V version. It has been modified by another owner. As I mentioned in a view days before I plan to stoke the block to 393 or 408 cui.
Due to the compression rate I have to know the type of my 4V heads because there are 4 differed versions and I don`t know what`s on my engine (but I know there are no BOSS heads)

• Standard 4V (61-64cc)
• Cobra Jet (74-77cc)
• High Output (74-77cc)
• Boss (64-67cc)

My question is how can I check the type of my 4V heads without dismounting them?


Attached Files Thumbnail(s)
   
best regards Christian

My Mustang is a "hybrid vehicle" it burns fuel and rubber Big Grin
  Reply
#2
(12-29-2010, 01:34 PM)hassi01 Wrote: Hello,

My 4V Cleveland was an original 2V version. It has been modified by another owner. As I mentioned in a view days before I plan to stoke the block to 393 or 408 cui.
Due to the compression rate I have to know the type of my 4V heads because there are 4 differed versions and I don`t know what`s on my engine (but I know there are no BOSS heads)

• Standard 4V (61-64cc)
• Cobra Jet (74-77cc)
• High Output (74-77cc)
• Boss (64-67cc)

My question is how can I check the type of my 4V heads without dismounting them?


If you can find the casting number on them:

http://home.comcast.net/~jelerath/mustan...ds-fr.html
http://mustangtek.com/heads/Heads.html
  Reply
#3
Those are either the standard "M" code 70-71 closed chamber heads or the CJ open chambers due to the bolt down style rockers. The HO and Boss heads had adjustable rockers with studs and guideplates.

IIRC, the little dot next to the 4 may denote the type of chamber. I 'll have to look at my CC heads again.
  Reply
#4
(12-29-2010, 02:56 PM)Hemikiller Wrote: Those are either the standard "M" code 70-71 closed chamber heads or the CJ open chambers due to the bolt down style rockers. The HO and Boss heads had adjustable rockers with studs and guideplates.

IIRC, the little dot next to the 4 may denote the type of chamber. I 'll have to look at my CC heads again.

HK from my understanding and all that I can find on the dot beside the 4 that means you've got early 72 4v or earlier heads...ford retooled for the gas crunch after about february 72 and the dot dissappeared so odds are they are closed chamber heads.
  Reply
#5
Here is information overload on the heads.
Dot or no Dot

http://351cleveland.wetpaint.com/page/4V...preadsheet

[Image: mustangnight010.jpg]
1972 Mustang Convertible 351C 4V
1966 Ford Galaxie 7 litre-4speed

Jorge
  Reply
#6
Hi Christian,
the casting number that you are looking for is on the under side of the heads (this is stupid). Look for the casting date code near the rocker arms. Dot or no dot dont give you a answer. You must bolt down the heads to be sure.


Attached Files
.jpg   Bild 192.jpg (Size: 120.48 KB / Downloads: 155)
.jpg   Bild 193.jpg (Size: 124.11 KB / Downloads: 150)
  Reply
#7
I haver 2 sets of 4v heads, 4v quench heads #0h27
4v open heads 1m23.
They are stamped in the rocker valley As soon as I can find my book I will try and get all the numbers.Hope this helps.
Jim
  Reply
#8
The stamped on the rocker valey are the date code.
0h27 = 1970 aug. 27
1m23 = 1971 oct. 23
When the date code 1970 and earlyer you have closed chamber heads after 70 OC or CC heads...

(12-29-2010, 03:58 PM)coilwire Wrote: I haver 2 sets of 4v heads, 4v quench heads #0h27
4v open heads 1m23.
They are stamped in the rocker valley As soon as I can find my book I will try and get all the numbers.Hope this helps.
Jim

  Reply
#9
shooting from the hip there. Have to clean this shop and find my ford engine books.Blush
Jim
  Reply
#10
Christian,

All of the above response are "right on" but I am not sure that the "answer" to your question is obvious.

I like to identify the 351C heads as being one of two types - - Closed (Quench) Chamber or Open Chamber. There are some differences in combustion chamber volumes within those types which would go to the "heart" of your need for an answer as to which heads you have. My interpretation is that you need that information to figure compression ratio. When considering compression ratio, it is important to appreciate there is not that much difference between the chamber volumes [b]within[/b] a given type (Quench or Open).

Other than observing the combustion chamber, the best way to identify the specific type is by casting number. As David stated in an earlier post (where he provided an excellent picture), the casting number is found on the underside of the head (when mounted on the block). In David's picture, it shows a casting number of "D1ZE" on one end of the head and "DA" on the other side which equates to a casting number of D1ZE-DA. This identifies the head as an Open Chamber Cobra Jet head as identified in the links in the other post. The link will also give you the chamber volume for that particular casting number.

Again, all of the responses are correct and very good information but just want to make sure that your SPECIFIC question is answered to include (my belief) information germane to why you are asking the question.

Hope this helps.

BT
Do the RIGHT thing.
  Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Two Different Heads srrodder 8 261 02-09-2017, 04:33 PM
Last Post: Stanglover
  351 cleveland mild build 2v heads Pastorpat 26 1,569 01-10-2017, 11:51 PM
Last Post: Pastorpat
  1971 351C-2V Piston type klinton994 25 628 12-12-2016, 10:34 PM
Last Post: barnett468
  Closed chamber heads straight swap from open? 83slimer 38 977 12-08-2016, 02:33 PM
Last Post: 83slimer
  D0AE-N heads. Curiosity Question Stanglover 6 362 11-18-2016, 09:40 AM
Last Post: Stanglover
  anyone need heads for engine delawarebill 3 297 11-18-2016, 08:49 AM
Last Post: delawarebill
  Speedmaster heads? scgamecock 9 577 09-03-2016, 01:14 PM
Last Post: c9zx
  C6 transmission oil type thomas1984 3 358 07-24-2016, 11:17 AM
Last Post: Hemikiller



Users browsing this thread: 1 Guest(s)