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Header size
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Darren 72



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    Post: #1
    Header size

    I think this is a simple question for someone. I checked my heads which are 4V's but I think the Hooker headers are too small. I have a 351C engine. What size is needed for this set-up?

    Thanks
    Offline 10-25-2010 07:56 PM
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    Tnfastbk



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      Post: #2
      RE: Header size

      351 Cleveland

      1970-73 2V (Open) 74-77 cc intake port 2.02 x 1.65" Exhaust port 1.84 x 1.38"

      1970-71 4V (Closed) 62.8cc intake port 2.50 x 1.75" Exhaust port 2.00 x 1.74"


      CJ & HO 4V (Open) 74-77 cc intake port 2.50 x 1.75" exhaust port2.00 x 1.74"
      Offline 10-25-2010 08:34 PM
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      Widowmaker00



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        Post: #3
        RE: Header size

        (10-25-2010 07:56 PM)Darren 72 Wrote:  I think this is a simple question for someone. I checked my heads which are 4V's but I think the Hooker headers are too small. I have a 351C engine. What size is needed for this set-up?

        Thanks

        What is done to the engine? The Hooker Competition headers you are most likely referring to are more than enough for a street engine.
        Offline 10-25-2010 08:35 PM
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        Darren 72



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          Post: #4
          RE: Header size

          (10-25-2010 08:35 PM)Widowmaker00 Wrote:  
          (10-25-2010 07:56 PM)Darren 72 Wrote:  I think this is a simple question for someone. I checked my heads which are 4V's but I think the Hooker headers are too small. I have a 351C engine. What size is needed for this set-up?

          Thanks

          What is done to the engine? The Hooker Competition headers you are most likely referring to are more than enough for a street engine.

          I was talking to a guy that looked under the hood and said my headers were for a 2V not a 4V. Thats all I know. Not sure if it's true or not. Do they sell headers for 2V vs 4V set-ups?
          (10-25-2010 09:26 PM)Darren 72 Wrote:  
          (10-25-2010 08:35 PM)Widowmaker00 Wrote:  
          (10-25-2010 07:56 PM)Darren 72 Wrote:  I think this is a simple question for someone. I checked my heads which are 4V's but I think the Hooker headers are too small. I have a 351C engine. What size is needed for this set-up?

          Thanks

          What is done to the engine? The Hooker Competition headers you are most likely referring to are more than enough for a street engine.

          I was talking to a guy that looked under the hood and said my headers were for a 2V not a 4V. Thats all I know. Not sure if it's true or not. Do they sell headers for 2V vs 4V set-ups?

          I bought the car in June and am just starting to get into it.
          (This post was last modified: 10-25-2010 09:27 PM by Darren 72.)
          Offline 10-25-2010 09:26 PM
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          Tnfastbk



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            Post: #5
            RE: Header size

            they do make headers for both the 2v and the 4v. The main diff is the size of the header inlet or head exhaust port. 2v vs a 4v kinda like a golf ball compared to a tennis ball. The 4v is noticeably bigger. Check out a web site such as summit racing and look ur headers for a 351c. It will list both.
            Offline 10-26-2010 04:59 AM
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            droptop73


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              Post: #6
              RE: Header size

              The 2v headers will bolt up to 4v heads, not sure if they will seal though. 4v headers will not seal the ports on a 2v head, there are areas of exposed tube beyond the head casting.
              Offline 10-26-2010 12:55 PM
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              jorgem2



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                Post: #7
                RE: Header size

                Hooker makes 2 classes of headers for the 4V, the regular "competition" header which has 1 3/4" pipes and are marketed more for street use and the "Super Competition" which have larger 1 7/8 to 2" pipes more for racing. As well as a different one for the 2V port
                He probably meant that the pipes are of the smaller variety and the same as the 2V headers he has seen before, which are 1 3/4"
                Offline 10-26-2010 04:41 PM
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                Darren 72



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                  Post: #8
                  RE: Header size

                  (10-26-2010 04:41 PM)jorgem2 Wrote:  Hooker makes 2 classes of headers for the 4V, the regular "competition" header which has 1 3/4" pipes and are marketed more for street use and the "Super Competition" which have larger 1 7/8 to 2" pipes more for racing. As well as a different one for the 2V port
                  He probably meant that the pipes are of the smaller variety and the same as the 2V headers he has seen before, which are 1 3/4"

                  Thanks for the help guys... I guess I should measure them and figure out what it actually is. Do the long headers at the correct size for a 4V head have issues clearing the steering box, too low etc...any issues here. Can I just bolt up and go with larger headers or will there be issues?

                  Another clue maybe....the car's Vin states H code. I'm wondering if the headers were on the original 2V heads. The heads are 4V's now. Maybe he didn't change out the exhaust when he upgraded? Would the smaller header restrict exhaust flow and allow some of the exhaust not to be discharged and the cylinders have a small percentage of the exhaust still in them during the next stroke cycle or intake cycle (which would steel horsepower)?

                  What are the best economical header for my set-up out there these days. I don't want crap but I also don't want to invest all my cash this winter in headers. I have other issues on the car that need attention.

                  Thanks for your help.
                  Offline 10-27-2010 07:38 AM
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                  Widowmaker00



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                    Post: #9
                    RE: Header size

                    The difference between the 2v and 4v headers from what I gather from Jegs is the tube length, which varies depending on which style of headers you get, comp or super comp. The 2v headers are only available in 1 3/4 diameters, but 4v offer 1 3/4, 1 7/8, and 2".

                    Either 2v or 4v headers should bolt up fine to 4v heads. So in other words, they are the same headers, except some are longer or shorter. If you do have 2v headers it wouldnt really make a difference, being as header length doesnt really come into play until your doing some high rpm action.

                    1 3/4 headers are fine street headers for 4v and 2v, IMO you are good.
                    (This post was last modified: 10-27-2010 12:10 PM by Widowmaker00.)
                    Offline 10-27-2010 11:57 AM
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                    Darren 72



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                      Post: #10
                      RE: Header size

                      (10-27-2010 11:57 AM)Widowmaker00 Wrote:  The difference between the 2v and 4v headers from what I gather from Jegs is the tube length, which varies depending on which style of headers you get, comp or super comp. The 2v headers are only available in 1 3/4 diameters, but 4v offer 1 3/4, 1 7/8, and 2".

                      Either 2v or 4v headers should bolt up fine to 4v heads. So in other words, they are the same headers, except some are longer or shorter. If you do have 2v headers it wouldnt really make a difference, being as header length doesnt really come into play until your doing some high rpm action.

                      1 3/4 headers are fine street headers for 4v and 2v, IMO you are good.

                      Thanks..I got some bogus info it appears. The guy that looked at them said they were the wrong headers..strictly for 2V but what you stated makes sense that they were used for both 2V and 4V. I need to measure them but I think they are 1 3/4"
                      Offline 11-04-2010 08:36 PM
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