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Header size
#1
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
Chasing Rust
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#2
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"
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#3
(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.
[Image: 25rnz1y.jpg]

~Buddy
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#4
(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.
Chasing Rust
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#5
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.
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#6
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.
Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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#7
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"
[Image: mustangnight010.jpg]
1972 Mustang Convertible 351C 4V
1966 Ford Galaxie 7 litre-4speed

Jorge
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#8
(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.
Chasing Rust
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#9
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.
[Image: 25rnz1y.jpg]

~Buddy
  Reply
#10
(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"
Chasing Rust
  Reply


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