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Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 03-03-2010   #1 (permalink)
Mustangman66 is offline Apprentice

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Question 1968 Mustang 302 2V vs. 4V

Hello, I have a 1966 Mustang that I just started to take the engine apart on. Turns out, it is a 1968 302 with 2V heads. Originally, I thought I had a 289 2V and was planning on swapping the intake and carb, basically going to a 4V setup. My question is, can someone tell me the exact differences between a F code and a J code 302? Is it worth swapping to 302 4V heads? I bought a Comp Cam that has an effective range of 1000-5200 rpm. I don't want a screamer, I want low end power. Also, I need to know if pistons, connecting rods, pushrods, and anything else that I need to change in order to get it right. Before I knew that it was a 302, I had planned on buying stock style 289 flat top pistons from a vendor. However, when going to their 68 302 section, the only option for pistons were dished. Did the J code come with flat top pistons? And if so, will Federal Mogul 273AP work with my 302 or should I get something else? Sorry for the long list of questions, but I would rather not screw this up. I'm not looking for a racer, just something with a little get up and go without major changes. Thanks in advance.

Tom
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1966 Coupe: 1968 302 4V setup, 4 speed transmission, going to be factory Ivy Green, and going to have Pony Ivy Gold and White interior. Currently a project for my father and I.

A new cold-air intake was cause enough for Ford to ask ol’ Carroll himself whether it was okay to move the Cobra badge from the driver’s to the passenger’s side of the grille. His response: “If it makes it go faster, then yes.”
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Unread 03-03-2010   #2 (permalink)
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You don't have to change the heads - just the intake and carb.
TRW has flat top pistons - # L2482F
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Unread 03-04-2010   #3 (permalink)
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Even Ford in 1968 stopped making 289-specific pistons. They used the shorter skirt 302 pistons for 289 replacements and I think you will find that is what everyone still does.

I did a similar stock 2V to 4V swap on a 289 as part of a complete engine overhaul. The swap did not require new pistons, but the worn out engine needed new pistons. Even though the catalog data sheet says 289, the invoice said 302 pistons; they both use the same part number. Note that the Ford part numbers given on the spec sheet below are for '79 and '86, long after 289s had been discontinued. Except for the valve relief these pistons are flat topped and with a 0.030" overbore gave me a 9.56:1 compression in a 289 using 54 cc heads (the same cc as a J-code). The extra CI of a 302 should give you closer to the J code 10:1. My calculations say that the valve relief cutouts total volume for these is 1.28 cc. I don't know the equivalent number for another mfg but I am sure they all make similar ones.

Silv-O-Lite - Better Pistons Since 1922
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Unread 03-04-2010   #4 (permalink)
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^^^ But what if I go with my 2V heads? I think they have 63cc. Basically, the only difference was intake, carb, and heads?
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1966 Coupe: 1968 302 4V setup, 4 speed transmission, going to be factory Ivy Green, and going to have Pony Ivy Gold and White interior. Currently a project for my father and I.

A new cold-air intake was cause enough for Ford to ask ol’ Carroll himself whether it was okay to move the Cobra badge from the driver’s to the passenger’s side of the grille. His response: “If it makes it go faster, then yes.”
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Unread 03-04-2010   #5 (permalink)
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the only difference is in the size of the combustion chambers as far as I know.
so any head from a 289 up to a 351w (obviously the boss and cleveland are different.) will work. as I understand it the 68 302 4-v was a one year only head and I personally would not worry about trying to find a set. if you are going to change heads go with a good set of aftermarket heads you will be way ahead. since you are changing and not keeping it original the marginal increase in compression for the amount of work and money is not worth it in my book. even if someone gave you the 4-v heads you would likely have to do a valve job.
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Unread 03-04-2010   #6 (permalink)
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I would also likely re-use the 63cc heads you already have. The pistons I used were the ones for a lower compression C-code in '66. Because of today's pump octane I didn't want the full compression of a '66 A-code which with the +.030 would have been somewhere above 10:1. It seems to me that those flat topped, 'low-compression' 289 pistons along with the increased stroke would be what would have made your 302 a higher-compression J code if it only had the 54cc heads. It will be easier to buy gas for those pistons in your 302 with 63cc heads.
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Unread 03-06-2010   #7 (permalink)
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What do you guys think about a set of GT40 heads and possibly 289 Hi po exhaust manifolds or Tri Ys? The heads I have on there now have rail style rockers on there now. The heads would just swap? Thanks.
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1966 Coupe: 1968 302 4V setup, 4 speed transmission, going to be factory Ivy Green, and going to have Pony Ivy Gold and White interior. Currently a project for my father and I.

A new cold-air intake was cause enough for Ford to ask ol’ Carroll himself whether it was okay to move the Cobra badge from the driver’s to the passenger’s side of the grille. His response: “If it makes it go faster, then yes.”
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