Hedman hedders - hooker headers, size?
Team Owner
Joined: Jan 2003
Posts: 20,315
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From: Summerland B.C. Canada
Originally Posted by Nico
The fact that the port fitment is not considered a problem is a relief to me. Thanks for that info. Glad that it isn´t smaller wich should be worse.
AGENT 86
Please measure the center - center with between the hedder connections to the Y when the car is up. That may help me to find a Y
AGENT 86
Please measure the center - center with between the hedder connections to the Y when the car is up. That may help me to find a Y
Large Impressive Member
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by CFI-EFI
For what it's worth, it is perfectly acceptable for the port in the header to be larger than the port in the head.
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In fact, that's generally considered to be a good thing. It adds some anti-reversion effect.
Team Owner
Joined: Oct 2004
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From: altered state
St. Jude Donor '05
Originally Posted by Corvette Kid NC
In fact, that's generally considered to be a good thing. It adds some anti-reversion effect. Absolutely, most peple arent aware of this.
Melting Slicks
Joined: May 1999
Posts: 2,037
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From: Sarasota FL
Header port size is not much of an issue when the headers are bigger than the heads, but the Elites (the thicker wall, coated, no emissions version in my case) came to me with a 1.2 x 1.4 port. My heads are ported 128s, but the ports weren't enlarged much. In fact, when I asked about port size when I noticed this problem, most on this forum agreed their stock 128 port size was greater than 1.2 across. So get the exact port size measurement of the headers before you buy. BTW, I asked before I bought the headers and Summit gave me the wrong dimensions. They gave me the 1.5 round dimension featured on the thinner wall, uncoated version of their headers.
To clarify, P/N 68448 came to me with 1.4 x 1.2 header ports which is SMALLER than my head ports. P/N 68440 has 1.5 round ports which works OK.
To clarify, P/N 68448 came to me with 1.4 x 1.2 header ports which is SMALLER than my head ports. P/N 68440 has 1.5 round ports which works OK.
Last edited by Aaron's 87; Apr 25, 2006 at 09:54 AM.
Team Owner
Joined: Jan 2003
Posts: 20,315
Likes: 245
From: Summerland B.C. Canada
Originally Posted by Nico
The fact that the port fitment is not considered a problem is a relief to me. Thanks for that info. Glad that it isn´t smaller wich should be worse.
AGENT 86
Please measure the center - center with between the hedder connections to the Y when the car is up. That may help me to find a Y
AGENT 86
Please measure the center - center with between the hedder connections to the Y when the car is up. That may help me to find a Y
I cut back the stock "Y" and will weld on the collector flanges and i'm done.
I did encounter a problem with the wiring harness on pass side and will have to reroute it a bit to avoid a meltdown.
Large Impressive Member
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by Aaron's 87
Header port size is not much of an issue when the headers are bigger than the heads, but the Elites (the thicker wall, coated, no emissions version in my case) came to me with a 1.2 x 1.4 port. My heads are ported 128s, but the ports weren't enlarged much. In fact, when I asked about port size when I noticed this problem, most on this forum agreed their stock 128 port size was greater than 1.2 across. So get the exact port size measurement of the headers before you buy. BTW, I asked before I bought the headers and Summit gave me the wrong dimensions. They gave me the 1.5 round dimension featured on the thinner wall, uncoated version of their headers.
To clarify, P/N 68448 came to me with 1.4 x 1.2 header ports which is SMALLER than my head ports. P/N 68440 has 1.5 round ports which works OK.
To clarify, P/N 68448 came to me with 1.4 x 1.2 header ports which is SMALLER than my head ports. P/N 68440 has 1.5 round ports which works OK.
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
I have the hedmans on mine, which is an 84. I ended up replacing the front y since I was already under there. Then I looked at the cat and said to myself, hell might just well replace that too. The front y, I just used a stock replacement , cut it and welded the flange. Plan on taking just about the entire exhaust off if you want to install it right. I did keep all the A.I.R hookups. I will say it was a royal PITA to install. You will have to make a new bracket for your alternator. I've had mine on for a few months now and them seem to be ok.
Team Owner
Joined: Jan 2003
Posts: 20,315
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From: Summerland B.C. Canada
Originally Posted by Corvette Kid NC
I knew that the Elites were an oval port but had never seen any measurements on them before. I did know that the standard Hedmans were 1.5" round as I've dealt with them before. That measurement on the Elites seems awfully small. What do your's measure, Dan?
I should have measured them. I was going to take a pic of the stock ports and headmans ports head to head, but forgot that too. 
They are taller ports than the stock opening but are pretty much the same size sideways. I port matched the sides and tops of the exhaust port and left a shelf on the bottom, similar to a "D" port design. I'm sure they will flow just fine and when i look into the ports of the stock manifold, i am reassured.
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Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by AGENT 86
Doooh !! too late I should have measured them. I was going to take a pic of the stock ports and headmans ports head to head, but forgot that too. They are taller ports than the stock opening but are pretty much the same size sideways. I port matched the sides and tops of the exhaust port and left a shelf on the bottom, similar to a "D" port design. I'm sure they will flow just fine and when i look into the ports of the stock manifold, i am reassured.
I should have measured them. I was going to take a pic of the stock ports and headmans ports head to head, but forgot that too. They are taller ports than the stock opening but are pretty much the same size sideways. I port matched the sides and tops of the exhaust port and left a shelf on the bottom, similar to a "D" port design. I'm sure they will flow just fine and when i look into the ports of the stock manifold, i am reassured.
Instructor
Joined: Apr 2004
Posts: 193
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From: peculiar mo
fit
i dont have elite's just plain black ones on my 89 but before i put them on i sat them over my second set of heads from a zz4(same 113) and didnt look like they would interfere. did almost the same as agent but still have a small leak on pass. side need to go back and weld a little spot.
Thread Starter
Racer
Joined: Oct 2005
Posts: 405
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From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
Should indeed be fine to know if there is no problem here. Otherwise I can take the 68440 type. There is hardly any rain here, so that may help to last long.
Thanks.
Thanks.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by Nico
Should indeed be fine to know if there is no problem here. Otherwise I can take the 68440 type. There is hardly any rain here, so that may help to last long.
Thanks.
Thanks.
The 68440 headers appear to be the standard quality, non-coated, headers that do NOT accept the hoses for the A.I.R. pump. Rain has little to do with anything, here. I would think you would want the hook up for the A.I.R. pump. The cheap, non-coated headers for the pump hook up is 48441. Those same headers, with the ceramic coating (highly recommended) is part number, 66441. The Elites are still the 68448s. If I were you, I would e-mail Hedman about the port sizes. *I* think the Elite headers are the better buy, with the thicker gauge tubes and thicker flanges, if the ports fit. It makes no sense why the ports on the Elites would be any different than any other header they make for the same application. If you write, tell them what you read here.
RACE ON!!!
Le Mans Master
Joined: Jul 2001
Posts: 6,252
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From: Silicon Valley Kalifornia
Nico, I just got my headers from TPiS. They've been making C4 headers longer than anyone else. I also got their Y pipe. The Y pipe is a work of art too. Got both headers and Y pipe ceramic coated. www.tpis.com
Large Impressive Member
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by CFI-EFI
Nico,
The 68440 headers appear to be the standard quality, non-coated, headers that do NOT accept the hoses for the A.I.R. pump. Rain has little to do with anything, here. I would think you would want the hook up for the A.I.R. pump. The cheap, non-coated headers for the pump hook up is 48441. Those same headers, with the ceramic coating (highly recommended) is part number, 66441. The Elites are still the 68448s. If I were you, I would e-mail Hedman about the port sizes. *I* think the Elite headers are the better buy, with the thicker gauge tubes and thicker flanges, if the ports fit. It makes no sense why the ports on the Elites would be any different than any other header they make for the same application. If you write, tell them what you read here.
RACE ON!!!
The 68440 headers appear to be the standard quality, non-coated, headers that do NOT accept the hoses for the A.I.R. pump. Rain has little to do with anything, here. I would think you would want the hook up for the A.I.R. pump. The cheap, non-coated headers for the pump hook up is 48441. Those same headers, with the ceramic coating (highly recommended) is part number, 66441. The Elites are still the 68448s. If I were you, I would e-mail Hedman about the port sizes. *I* think the Elite headers are the better buy, with the thicker gauge tubes and thicker flanges, if the ports fit. It makes no sense why the ports on the Elites would be any different than any other header they make for the same application. If you write, tell them what you read here.
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Corvette Kid NC
The Elites are indeed oval port, according their website. But I just can't believe they would measure only 1.2" wide as someone mentioned earlier. If his did, they have a serious QC issue.
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Thread Starter
Racer
Joined: Oct 2005
Posts: 405
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From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
Originally Posted by CFI-EFI
I looked for the header port size and shape in the footnotes and the application listing, but I didn't find anything. Can you give me a clue as to where you saw that?
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Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by CFI-EFI
I looked for the header port size and shape in the footnotes and the application listing, but I didn't find anything. Can you give me a clue as to where you saw that?
RACE ON!!!
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
I can see how the wall thickness of the tubes and the flange thickness could make some minor differences, but since they are all made for the same applications, I find it hard to believe that there is a major difference in the port configurations. Those damn Hedman are so close to one another and don't seem to follow any logical pattern as to coating or type. *I* keep writing down the wrong part numbers. I would encourage Nico to e-mail directly to Hedman about the port size, and any other concerns to get their assurances he will have no problems, down the road. I would tell Hedman that you read about the 1.5" X 1.2" port size on the Corvette Forum, and that without their assurances, you are reluctant to invest international freight, and custom duties on a questionable product. If their customer service department is worth a darn, they ought to have some answers for you.
RACE ON!!!
RACE ON!!!
