Still Yet...Another Header Question
Thread Starter
Melting Slicks
Joined: Sep 2003
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From: I live at www.domesticlugnuts.com I sleep in PA
Still Yet...Another Header Question
What is the performance difference between 1 5/8" & 1 3/4" Longtubes.
The engine is a modified 350 pushing just over 400 HP and 400 Torque.
The engine is a modified 350 pushing just over 400 HP and 400 Torque.
Team Owner
Joined: Oct 2004
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From: altered state
St. Jude Donor '05
Originally Posted by Rich & Lisa_84
What is the performance difference between 1 5/8" & 1 3/4" Longtubes.
The engine is a modified 350 pushing just over 400 HP and 400 Torque.
The engine is a modified 350 pushing just over 400 HP and 400 Torque.
Like cams, it's always better to be a little conservative
You were running the holley systemax, right?
Thread Starter
Melting Slicks
Joined: Sep 2003
Posts: 3,326
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From: I live at www.domesticlugnuts.com I sleep in PA
Correct on the SysteMax ll Kit. This is in my 84 Vette and I'm about to purchase a set of headers. I think I would rather have the torque than the HP. Getting off the line and up to speed is more important to me than trying to get to 200 MPH.
Does anyone know the improvement of Longtubes over the stock header that came with the 84.
Does anyone know the improvement of Longtubes over the stock header that came with the 84.
Last edited by Rich & Lisa_84; Dec 30, 2004 at 01:02 AM.
Race Director
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From: St. Peters MO Sometimes you have to prove yourself by doing alot of killing or alot of dying...
This is a topic that will get real ugly real fast... but check out the link...
http://forums.corvetteforum.com/showthread.php?t=978171
Granted... this is only paper figures not real world figures... but it does make a bold statement.
http://forums.corvetteforum.com/showthread.php?t=978171
Granted... this is only paper figures not real world figures... but it does make a bold statement.
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Team Owner
Joined: May 2002
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
The argument has gone back and forth so many times.... that my plan when shopping for headers is to focus on the manufacturer and quality of fit and finish first, and size second.
Burning Brakes
Joined: Apr 2004
Posts: 792
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From: Stanfield NC
I can't speack to the 1 5/8 or to your choice of Hedman, but I just returned from the dyno with my 88 L98. Base line runs with no mods other than a 160 thermostadt was 211HP/304TQ. I then installed TPIS long tubes, ceramic coated 1/3/4, and the TPIS/flowmaster exhaust with out cats. I tossed the frisbee, cut the air cleaner lit, removed all the air pump hoses and connections, removed the screens and fins from the MAF and further modified the MAF with some of my ideas. I added an adjustable fuel preassure regulator, a heated O2, and an air foil ( yeah yeah I know) 
Second series of dyno pulls were at 247HP/330TQ. I was fairly pleased with the upgrade results, but had hoped toi break 250. Next is a dyno tune of the PROM, and then I am done for this year.
Don't know if this will help with your decisions, but I think it is fairly representative of the monor modifications that most start with and the results are documented.
Second series of dyno pulls were at 247HP/330TQ. I was fairly pleased with the upgrade results, but had hoped toi break 250. Next is a dyno tune of the PROM, and then I am done for this year.Don't know if this will help with your decisions, but I think it is fairly representative of the monor modifications that most start with and the results are documented.
Team Owner
Joined: Oct 2004
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From: altered state
St. Jude Donor '05
Originally Posted by Rich & Lisa_84
Okey Dokey, Thanks for the reply's and link. Now that I have decided to go with 1 5/8", What is the general opinion of Heddman Headers?
Race Director
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From: St. Peters MO Sometimes you have to prove yourself by doing alot of killing or alot of dying...
Check out Hooker too. I've seen some instances where the fitment of Heddman left something to be desired. It wasn't a bad fit by any means... but anytime I have to massage a part to fit... it is dissappointing to me. On the flip side... I had Heddman's on my old 78 TA and they fit better than my friends who had Hooker... so take that as you will.
Team Owner
Joined: May 2002
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Supposedy heddman has two brands of headers...
The crappy ones with thin flanges that dont fit well, and the elusive really nice ones with thicker flanges and better QC.
The crappy ones with thin flanges that dont fit well, and the elusive really nice ones with thicker flanges and better QC.
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
Where's CFI-EFI? These threads are like blood in the water to a shark, for him..... Myself, I've sworn off of them. 
Race Director
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From: The Top of Utah
Originally Posted by Corvette Kid NC
Where's CFI-EFI? These threads are like blood in the water to a shark, for him..... Myself, I've sworn off of them.
Bear in mind that the graphs are modeled for 434 cid engines. Also read the comments by both Ski-dwn-it and Corkvette, concerning their real world experiences with changing headers and 1/4 mile ETs on their 406 and 434 engines. The big numbers make the headlines. One must learn to pay attention to the whole graph and consider the engine operating range that is used most often and that is most important the their own needs. Also don't forget to scale things down to the size engine you're dealing with.
RACE ON!!!
Drifting
Joined: Aug 2004
Posts: 1,830
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From: atlanta Georgia
make sure you get them Ceramic Coated!!!
most companies don't really ceramic coat them. when they say they are coated they dip plate the outside with cheap metal!
this doesnt do anything! except peel after a yr! also alot dont even coat inside and out!
get the real ceramic coating!
I will ceramic coat any headers inside and out for $188.
this includes all preping, 3 yr warranty, and a limited lifetime rust warranty. !!!!!!!
this is the best price/guarentee out there!
please email me and let me know!
your friend
Sean Blanton
slimshaby@mindspring.com
most companies don't really ceramic coat them. when they say they are coated they dip plate the outside with cheap metal!
this doesnt do anything! except peel after a yr! also alot dont even coat inside and out!
get the real ceramic coating!
I will ceramic coat any headers inside and out for $188.
this includes all preping, 3 yr warranty, and a limited lifetime rust warranty. !!!!!!!
this is the best price/guarentee out there!
please email me and let me know!
your friend
Sean Blanton
slimshaby@mindspring.com