1 7/8" headers for an LT1 C4?
Thread Starter
Drifting
Joined: May 2004
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From: Gretna NE
St. Jude Donor '09
1 7/8" headers for an LT1 C4?
Im looking at switching from my 1 3/4" TPiS headers to some 1 7/8" headers. The only place I have found so far is Exotic Muscle's. Anyone know of any other manufacters of them out there? I like Kooks but don't know if they make them for a C4? Any help appreciated,
Dan
Dan
Le Mans Master
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From: Jenison MI
Cruise-In VI Veteran
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St. Jude Donor '06
why? what are you doing to the motor that would make you do this change? I went from 1-3/4 to 1-7/8 on my 540ci BB and only shown a few HP difference on the dyno. Not really worth the money if you ask me. but what's done is done.
As for the C4, EM is the only one that "I" know of.
As for the C4, EM is the only one that "I" know of.
Drifting
Joined: Feb 2002
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From: Little Rock Arkansas
If your engine doesn't need 1 7/8" it will cost you power... That said, the best ones are Jere Stahl's (www.stahlheaders.com). He has them both stepped and straight and they come with the adapter plates I believe. They will fit all of the C4 chassis'.
-Jeb
-Jeb
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...
man you have to be pushing some serious power to warrant those beasts!!! You need at least 500+ at the crank to justify that. Check with CFI-EFI regarding this... he'll know a methodical approach to your question.
Thread Starter
Drifting
Joined: May 2004
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From: Gretna NE
St. Jude Donor '09
Humm well i was told by several people my combonation might require 1 7/8 headers. Mods are in the signature. Ill be revving around 7500rpm and will have a solid roller cam in the 250s duration range with a lift around .625. The 215RR AFR heads flow ~340 peak at .650 lift. Looking at 600-625 FWHP (i hope 
). Will be completely naturally aspirated. Do you think going to 1 7/8 headers are worth it?
). Will be completely naturally aspirated. Do you think going to 1 7/8 headers are worth it?
Drifting
Joined: Feb 2002
Posts: 1,952
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From: Little Rock Arkansas
Originally Posted by ddr698
Humm well i was told by several people my combonation might require 1 7/8 headers. Mods are in the signature. Ill be revving around 7500rpm and will have a solid roller cam in the 250s duration range with a lift around .625. The 215RR AFR heads flow ~340 peak at .650 lift. Looking at 600-625 FWHP (i hope ). Will be completely naturally aspirated. Do you think going to 1 7/8 headers are worth it?
). Will be completely naturally aspirated. Do you think going to 1 7/8 headers are worth it?-Jeb
Melting Slicks
Joined: Jul 2003
Posts: 2,284
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From: Canton MI
Originally Posted by ddr698
Humm well i was told by several people my combonation might require 1 7/8 headers. Mods are in the signature. Ill be revving around 7500rpm and will have a solid roller cam in the 250s duration range with a lift around .625. The 215RR AFR heads flow ~340 peak at .650 lift. Looking at 600-625 FWHP (i hope ). Will be completely naturally aspirated. Do you think going to 1 7/8 headers are worth it?
). Will be completely naturally aspirated. Do you think going to 1 7/8 headers are worth it?iam using the same heads on my motor , my heads flow little bit more , i had mine angle cut so the valves are a 19 degree head not 23 any more . iam also using the 1 7/8
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
Yeah, you might actually be able to use them. Especially if you're tuning for mainly high RPM use. My tuner told me I could even use them. I just nodded politely. Don't get me wrong, he's good, if a little eccentric. He tunes cars for Bonneville!
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Thread Starter
Drifting
Joined: May 2004
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From: Gretna NE
St. Jude Donor '09
Looks like i may look into the Stahl headers but they don't have a 1 7/8" option that allows for hooking up an exhaust system behind it? Humm it is a "street" car so that ill need. Maybe EM 1 7/8"s would be the answer?
Thread Starter
Drifting
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From: Gretna NE
St. Jude Donor '09
Originally Posted by zelement
you have a pretty bad setup in your sig. Are you running DFI or FAST?
I think your injectors are too big and you don't really need 1 7/8 headers but that's just my opinion.
I think your injectors are too big and you don't really need 1 7/8 headers but that's just my opinion.
Well i wouldn't call it running FAST yet, my AFRs just arrived yesterday after a 10 month wait so shortly I guess It will run shortly. The injector size was picked by the HP formula so i don't think ill have any problems. As for headers im leaning toward 1 7/8" but i dunno.........
Drifting
Joined: Feb 2002
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From: Little Rock Arkansas
Stahl makes them to fit with an exhaust system... You'll have to fab the exhaust system obviously, the factory style system certainly won't bolt up the the 3.5" collectors. I know they've got them because I built a blown LT1 car a few years ago and used them; then I fabbed a set for my '90 using them as a jig.
-Jeb
-Jeb
Thread Starter
Drifting
Joined: May 2004
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From: Gretna NE
St. Jude Donor '09
Humm I think Ill give Stahl a call and get some more info, their website is a lil confusing cuz i also only see stepped headers for the C4.
Humm BTW you may want to double check your valve angles. Im almost positive its impossible to roll over a head 3.5 degrees (the heads are orginally 22.5 degree as advertised by AFR) by simply angle milling them.... correct me if im wrong?
Originally Posted by red L98
iam using the same heads on my motor , my heads flow little bit more , i had mine angle cut so the valves are a 19 degree head not 23 any more .
Humm BTW you may want to double check your valve angles. Im almost positive its impossible to roll over a head 3.5 degrees (the heads are orginally 22.5 degree as advertised by AFR) by simply angle milling them.... correct me if im wrong?
Safety Car
Joined: Apr 2001
Posts: 3,525
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From: Houston TX
What was the pricing for the Stahl headers? If enough individuals are looking for the 1 7/8" Stahl headers (with exhaust hook-up), then maybe a group purchase could be arranged.
Thoughts?
Aaron
Thoughts?
Aaron
Le Mans Master
Joined: Feb 2002
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From: San Marcos Texas
I looked into the 1 7/8" headers when building my engine. But the extra cost per HP wasn't worth it to me. Stalh quoted me like $1600 for their headers. 
The extra $1000 over the cost of 1 3/4" headers for 15-20hp more(if your luckly 
) wasnt worth it. Save the $1000 and install a 150 shot of NOS. More bang for your buck. An extra 150hp on top of my 400rwhp for under a $1000, I like that. 
Hey Jeb, do you really think its cost effective to use 1 7/8" headers dollar per HP wise?
The extra $1000 over the cost of 1 3/4" headers for 15-20hp more(if your luckly ) wasnt worth it. Save the $1000 and install a 150 shot of NOS. More bang for your buck. An extra 150hp on top of my 400rwhp for under a $1000, I like that. Hey Jeb, do you really think its cost effective to use 1 7/8" headers dollar per HP wise?
Last edited by chriswtx; Dec 23, 2004 at 12:02 AM.
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From: St. Peters MO Sometimes you have to prove yourself by doing alot of killing or alot of dying...
Originally Posted by ddr698
Humm well i was told by several people my combonation might require 1 7/8 headers. Mods are in the signature. Ill be revving around 7500rpm and will have a solid roller cam in the 250s duration range with a lift around .625. The 215RR AFR heads flow ~340 peak at .650 lift. Looking at 600-625 FWHP (i hope ). Will be completely naturally aspirated. Do you think going to 1 7/8 headers are worth it?
). Will be completely naturally aspirated. Do you think going to 1 7/8 headers are worth it?
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
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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 ddr698
Looks like i may look into the Stahl headers but they don't have a 1 7/8" option that allows for hooking up an exhaust system behind it? Humm it is a "street" car so that ill need. Maybe EM 1 7/8"s would be the answer?