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Discussion Starter #1
Do the 68 3024v heads have any identification such as 3024v stamped on top beneath the valve covers?If not what is the best way to identify?
 

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Yes these heads have 4-v cast between the rocker arm studs.Look for C80E-F and 68 302 on the underside of the head around the pushrod holes but the 4-v on the top is the easiest way to check

<font size=-1>[ This Message was edited by: frdnut on 1/26/02 9:40am ]</font>
 

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Yes the '68 4bbl heads have 4V cast into them, usually it is between the rocker stand bosses. Also the 2bbl heads are cast 2V.
 

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Off the subject, but...

I asked about 4-v heads in a previous post. My understanding was that there was no difference between 2-V and 4-V 302 heads in the casting, the difference was in the shape of the piston head and therefore in compression.

Somebody care to set me straight???
 

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I believe the 4V heads have 53.5cc chambers for a 10:1 CR with the stock pistons, the 2V heads are 58cc.
 

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I have a set of heads I posted about awhile back. The air cleaner cover said 302 4v. It does not say 4V on top of the head. It says 302 and in a different spot it says B. Any ideas as to if it is a 4v? It is not a boss head.
 

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The J code 302-4V was only made in 68. It was rated at 10.5:1 compression and 230 bhp(Shelby was rated at 250). The F code 302-2V was made from 68-73. The 68 F code had 10:1 compression and made 210 bhp. The 69 and 70 F code 302's are rated at 220 bhp. They dropped off after that. The 68 J and F code heads show to be the same in my information. The difference in horsepower was from a higher compression piston and the 4 barrel intake and carb.

There is nothing else special or different about these heads except that they have smaller combustion chamber sizes compared to later year 302 heads as Ford dropped the compression in stages. By 1972 the 302 had 8.5:1 which came from a combination of 58 cc chambers and lower compression pistons.

Technically there is no special 4V head that is different from a 2V head for a 302 based on what I know. If someone has different spec's for a 4V versus a 2V 302 head I will be glad to correct my feeble brain cells(after I see it, LOL).
 

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In 68 the 2v heads change combustion chambers to the larger 60-63 cc. The 4v or Jcode had the same chambers as the 66-67 289 heads that were 52-54 cc.
 

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The real skinny on '60s small block Ford engines can be found in Bob Mannels book.

There are pictures and specs on virtually every small block head used in the '60s

I doubt there is a book anywhere on any engine that has more info than this one.



http://www.fordsmallblock.com/


____________
1969 Fairlane Cobra [email protected] Bone stock no traction






<font size=-1>[ This Message was edited by: TurboCoupe50 on 1/27/02 9:47pm ]</font>
 

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I have an original 68 J code 302 mustang and can tell you positively that the difference between the heads is the 4-v heads have the small chambers 53.5ccs and the 2-v heads have the much bigger 63cc chambers (for 68 at least).
 

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that's right I'am looking at mine right now.
the are a good head for stock performance or 68 make overs to restore a stang. but they were only made and put on 68 302 mustangs maybe 69 very few
Alan
 

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Discussion Starter #12
so what everyones saying is the 302 4v heads are really no better than 289 heads and the advertised 10:01 compression on 68 4v was obtained with these heads and a piston change.so i can't put a set of 68 302 4v heads on my 66 289 and gain any compression or other performance increase?
 

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Yes you are right these heads would only increase your compression by about .1, so no there is basically no difference from your 66 289 heads.
 
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