LS1 - what header #???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMC69mnypit · 08-16-2005, 03:56 PM

LS1 guys-

Anyone running full length headers? Has anyone tried running full length F-body headers, or the truck full lengths?? I've seen several swap threads, but no specifics on what headers they used?

Thanks
Brandon

FirstGen · 08-17-2005, 11:57 AM

I'm running ported Mac mid length's. Only header that will leave you good ground clearance on a lowered truck and will even fit in the frame some what. You still have to cut the frame some to make these fit...

Frizzle Fry · 08-17-2005, 02:02 PM

I will use full length C5 Headers on my '61.

FirstGen · 08-17-2005, 02:19 PM

Quote:

Originally Posted by Frizzle Fry

I will use full length C5 Headers on my '61.

C5 headers won't work for anyone unless they are using a full C5 suspension/rear T56 setup like you are. You basically are using a C5 chassis with a 61 truck body. So for all practical purposes you have a C5 to buy mechanical parts for except that I'm sure you had to lengthen the wheelbase some.

How do you plan to lengthen the driveline?

Cool project!

Frizzle Fry · 08-17-2005, 06:03 PM

Yes, that's correct. I was just chiming in for no real reason.

I'm having a spacer and longer shaft machined to move the diff portion of the transaxle back 7". My rear suspension and trans cradle are already moved back (no cutting of the frame rails). By spacing back the diff from the trans I don't need to lengthen the torque tube or shift linkage.

Your exactly right, it is a full C5 rolling chassis w/ a truck body

Didn't mean to hijack the thread.

To provide some real advice: I'd suggest having them custom made. You may be able to modify truck BBC headers by cutting off the primary flange and installing an LS1/GenIII flange. Good luck!

FirstGen · 08-17-2005, 06:08 PM

Not at all, that's going to be a hell of a machine when you get it all up and running.
Take care,
Taylor

GMC69mnypit · 08-18-2005, 06:07 AM

Hey guys, thanks for your replys.

Firstgen, you've got a very clean looking install, hope mine turns out as well. Seen you over on LS1tech, too.

I'm not planning on lowering it, so clearance won't be much of an issue, as long as they aren't much lower than the traditional small block and big block full lenths were, I'd be happy. I'm running dual 2 1/2" with 40 series flowmasters right now behind the big block, I'd like to try and keep as much of that system as possible behing the LS1, trying to avoid stock manifolds and hacked up y pipe patched into the duals.

Thanks for your help,
Brandon

68LSS1 · 08-18-2005, 09:18 AM

I test fitted a set of KOOKS and a set of Hooker LT's both sets for a F-body. The problem is that the headers come in towards the engine and hit where on the stock mount that goes from the frame to the cross member. And even if you corrected for this problem the other problem is that they also tuck up to the engine and then curve and turn out. This is to clear the lower a-arm on the Camaro. Since they cannot go below it due to ground clearance, the header sort of follows the contour around it, which results in the collector pointing at and contacting the frame. With the Hookers the O2 bung was against the frame also, a easy fix, but something else that would have to be corrected. There are a couple pix of the KOOKS in the link in my sig. Beautiful headers though.

Edit for: your best bet will probably be to modify a cheaper set of Camaro LT's or get the S&P headers. If performance is the number priority then making your own is the only way to go.

FirstGen · 08-18-2005, 11:23 AM

Quote:

Originally Posted by GMC69mnypit

Hey guys, thanks for your replys.

Firstgen, you've got a very clean looking install, hope mine turns out as well. Seen you over on LS1tech, too.

I'm not planning on lowering it, so clearance won't be much of an issue, as long as they aren't much lower than the traditional small block and big block full lenths were, I'd be happy. I'm running dual 2 1/2" with 40 series flowmasters right now behind the big block, I'd like to try and keep as much of that system as possible behing the LS1, trying to avoid stock manifolds and hacked up y pipe patched into the duals.

Thanks for your help,
Brandon

Brandon,

Thanks for the compliments. As 68LSS1 stated, I really don't think using any stock LT F-body header will be cost or time effective. I tried to use a set of cheap flowtechs once and I was going to cut them up as needed. After mocking them up, I decided to sell them and look for something else because I figured it would be way too much hacking. The Mac's I am running are the closest thing to a good fit for the money. If you are on a budget these are going to be your best bet. You can pick up these headers for 100-150 used all day long. I made 450+ rwhp with them so I think they flow pretty well.

Good luck.

masterbeavis · 08-18-2005, 10:59 PM

what about finding a set of corvette manifolds??? I was reading in car craft a few months ago that the corvette manifolds did a very good job. Headers added a whopping 10-15HP. When I do my LSI/LM7 swap, thats what I will be looking for.

FirstGen · 08-18-2005, 11:50 PM

Yeah if you can find my origional post titled "LS1/T56" it shows the vette manifolds I used in the begenning. They don't exactly just drop right in. I had to cut and re-weld the collector area to make them clear the rear of the bottom control arm area.

masterbeavis · 08-19-2005, 02:00 AM

Quote:

Originally Posted by FirstGen

Yeah if you can find my origional post titled "LS1/T56" it shows the vette manifolds I used in the begenning. They don't exactly just drop right in. I had to cut and re-weld the collector area to make them clear the rear of the bottom control arm area.

the search feature would be nice.... Id like to see pics from that. My swap will be for a 4wd, so stuff will be different, but it would stillbe nice to see what Iam getting into.

GMC69mnypit · 08-19-2005, 10:26 AM

Hey guys, thanks for your help. I'm wondering how truck headers would fit, anyone tried going that route? I don't even know if anyone makes a full length version for the 5.3 / 6.0 's though. And, if your truck is lowered the clearance thing would probably really be an issue with them.

I've got an '02 2500HD with the 6.0. Been looking at the routing of the exhaust and trying to visualize what headers would look like and trying to compare that with pictures of ls1's in the 67-72's.

I just don't know...surely there's a way (other than make your own).

Brandon

GMC69mnypit · 08-19-2005, 04:43 PM

I talked to the guys at Street and Performance today, they say they have a header that will fit, they used it in their '68 LS1 conversion. They can't gaurantee it will fit unless you use their motor mount adapters. It doesn't appear to be full length, more like 3/4, 1 5/8" primaries.

Anybody heard anything about these?

they are at http://www.hotrodlane.cc/

FirstGen · 08-19-2005, 06:05 PM

Quote:

Originally Posted by GMC69mnypit

I talked to the guys at Street and Performance today, they say they have a header that will fit, they used it in their '68 LS1 conversion. They can't gaurantee it will fit unless you use their motor mount adapters. It doesn't appear to be full length, more like 3/4, 1 5/8" primaries.

Anybody heard anything about these?

they are at http://www.hotrodlane.cc/

Yeah, they are expensive so I quite looking right there. I can have a set made for the money they want.

GMC69mnypit · 08-23-2005, 01:21 PM

Well, I set the LS1 and tranny in the frame today for a trial fit, I'm really curious if the truck style headers will work.

Found these for 2wd newer Silverado's, really thinking about trying them unless someone has been down that road already.

http://byunspeed.com/catalog/product...933a4a9425570c

What do you think??

Brandon

Custom 68 · 08-23-2005, 01:46 PM

alot of it depends on the engine placement, depending on what you are planning I moved my engine back about 5-6 inches from the original SBC placement this allowed me to use the ZO6 manifolds without modification. It also helped with the weight (I assume) everythign is tight but fits. I made my own motor mounts and spacers coming up from my front "crossmember"
Good luck.
Dave

FirstGen · 08-23-2005, 11:49 PM

I really don't think they will work, considering that the manifolds from the trucks won't even fit. But, they could be just perfect. They definatly look like they would be low to the ground...

FirstGen · 08-23-2005, 11:51 PM

Quote:

Originally Posted by Custom 68

alot of it depends on the engine placement, depending on what you are planning I moved my engine back about 5-6 inches from the original SBC placement this allowed me to use the ZO6 manifolds without modification. It also helped with the weight (I assume) everythign is tight but fits. I made my own motor mounts and spacers coming up from my front "crossmember"
Good luck.
Dave

Dave,
By you saying that you moved the motor back 5-6 inches what do you mean? I just don't see how you had the room to do that. You have any pictures? I'd especially like to see the un-modified Z06 manifolds and how they fit. Nice work.
-Taylor

Custom 68 · 08-24-2005, 09:14 AM

Taylor I will gather up some pictures and take some more, basically I moved everything back and suspended it as far back as it would go then I made the mounts to fit. I will see if I can show it in the pictures.
I got the manifolds off E-bay and understood they were Z06 they are cast pieces I think some I saw of yours looked fabed, I compared them to pictures in car craft and they looked the same they look like shorter headers except cast iron.

I need to get some pictures up here I havent done that since the conversion
Dave

Custom 68 · 08-24-2005, 09:16 AM

I even tucked the AC in the stock place, I havent got the hoses hooked up yet am going to need some different ones but I think they should fit.

FirstGen · 08-24-2005, 08:28 PM

Quote:

Originally Posted by Custom 68

I even tucked the AC in the stock place, I havent got the hoses hooked up yet am going to need some different ones but I think they should fit.

Awesome, I got the compressor in fine just had trouble with one of the lines. Can't wait to see pics. Those are LS6 manifolds you are describing. In fact you may have bought them from me on ebay? I sold two sets a while back. My ebay user id is: Unlimitedlandscape. I planned to use a pair of those in a twin turbo LS1 project C10 I will be building for a buddy in the next few months.

Take care,
Taylor

08-16-2005, 03:56 PM	#1
GMC69mnypit !Women...!!!! Join Date: Jan 2005 Location: South of Hays, Kansas Posts: 40	LS1 - what header #???? LS1 guys- Anyone running full length headers? Has anyone tried running full length F-body headers, or the truck full lengths?? I've seen several swap threads, but no specifics on what headers they used? Thanks Brandon __________________ '69 GMC 1/2T LWB 2WD '02 Silverado 2500HD 4X4 '79 ElCamino SS

08-17-2005, 11:57 AM	#2
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	I'm running ported Mac mid length's. Only header that will leave you good ground clearance on a lowered truck and will even fit in the frame some what. You still have to cut the frame some to make these fit... __________________ 1968 C10 build in process TT LSA/6L90e/9"

08-17-2005, 06:03 PM	#5
Frizzle Fry Registered User Join Date: Aug 2005 Location: Hillsboro Oregon Posts: 6,449	Yes, that's correct. I was just chiming in for no real reason. I'm having a spacer and longer shaft machined to move the diff portion of the transaxle back 7". My rear suspension and trans cradle are already moved back (no cutting of the frame rails). By spacing back the diff from the trans I don't need to lengthen the torque tube or shift linkage. Your exactly right, it is a full C5 rolling chassis w/ a truck body Didn't mean to hijack the thread. To provide some real advice: I'd suggest having them custom made. You may be able to modify truck BBC headers by cutting off the primary flange and installing an LS1/GenIII flange. Good luck! Last edited by Frizzle Fry; 08-17-2005 at 06:07 PM.

08-17-2005, 06:08 PM	#6
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	Not at all, that's going to be a hell of a machine when you get it all up and running. Take care, Taylor __________________ 1968 C10 build in process TT LSA/6L90e/9"

08-18-2005, 06:07 AM	#7
GMC69mnypit !Women...!!!! Join Date: Jan 2005 Location: South of Hays, Kansas Posts: 40	Hey guys, thanks for your replys. Firstgen, you've got a very clean looking install, hope mine turns out as well. Seen you over on LS1tech, too. I'm not planning on lowering it, so clearance won't be much of an issue, as long as they aren't much lower than the traditional small block and big block full lenths were, I'd be happy. I'm running dual 2 1/2" with 40 series flowmasters right now behind the big block, I'd like to try and keep as much of that system as possible behing the LS1, trying to avoid stock manifolds and hacked up y pipe patched into the duals. Thanks for your help, Brandon __________________ '69 GMC 1/2T LWB 2WD '02 Silverado 2500HD 4X4 '79 ElCamino SS

08-17-2005, 02:02 PM	#3
Frizzle Fry Registered User Join Date: Aug 2005 Location: Hillsboro Oregon Posts: 6,449	I will use full length C5 Headers on my '61.

08-18-2005, 09:18 AM	#8
68LSS1 Registered User Join Date: Dec 2002 Location: Tampa Posts: 1,191	I test fitted a set of KOOKS and a set of Hooker LT's both sets for a F-body. The problem is that the headers come in towards the engine and hit where on the stock mount that goes from the frame to the cross member. And even if you corrected for this problem the other problem is that they also tuck up to the engine and then curve and turn out. This is to clear the lower a-arm on the Camaro. Since they cannot go below it due to ground clearance, the header sort of follows the contour around it, which results in the collector pointing at and contacting the frame. With the Hookers the O2 bung was against the frame also, a easy fix, but something else that would have to be corrected. There are a couple pix of the KOOKS in the link in my sig. Beautiful headers though. Edit for: your best bet will probably be to modify a cheaper set of Camaro LT's or get the S&P headers. If performance is the number priority then making your own is the only way to go. __________________ '68 Short Step LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc Last edited by 68LSS1; 08-18-2005 at 09:21 AM.

08-18-2005, 10:59 PM	#10
masterbeavis Having issues Join Date: Jul 2005 Location: Eldorado Ca, an hour east of sacramento Posts: 696	what about finding a set of corvette manifolds??? I was reading in car craft a few months ago that the corvette manifolds did a very good job. Headers added a whopping 10-15HP. When I do my LSI/LM7 swap, thats what I will be looking for. __________________ Quando Omni Flunkus Moritati. The Man's Prayer: "I'm a man, but I can change, if I have to, I guess."

08-18-2005, 11:50 PM	#11
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	Yeah if you can find my origional post titled "LS1/T56" it shows the vette manifolds I used in the begenning. They don't exactly just drop right in. I had to cut and re-weld the collector area to make them clear the rear of the bottom control arm area. __________________ 1968 C10 build in process TT LSA/6L90e/9"

08-19-2005, 10:26 AM	#13
GMC69mnypit !Women...!!!! Join Date: Jan 2005 Location: South of Hays, Kansas Posts: 40	Hey guys, thanks for your help. I'm wondering how truck headers would fit, anyone tried going that route? I don't even know if anyone makes a full length version for the 5.3 / 6.0 's though. And, if your truck is lowered the clearance thing would probably really be an issue with them. I've got an '02 2500HD with the 6.0. Been looking at the routing of the exhaust and trying to visualize what headers would look like and trying to compare that with pictures of ls1's in the 67-72's. I just don't know...surely there's a way (other than make your own). Brandon __________________ '69 GMC 1/2T LWB 2WD '02 Silverado 2500HD 4X4 '79 ElCamino SS

08-19-2005, 04:43 PM	#14
GMC69mnypit !Women...!!!! Join Date: Jan 2005 Location: South of Hays, Kansas Posts: 40	I talked to the guys at Street and Performance today, they say they have a header that will fit, they used it in their '68 LS1 conversion. They can't gaurantee it will fit unless you use their motor mount adapters. It doesn't appear to be full length, more like 3/4, 1 5/8" primaries. Anybody heard anything about these? they are at http://www.hotrodlane.cc/ __________________ '69 GMC 1/2T LWB 2WD '02 Silverado 2500HD 4X4 '79 ElCamino SS Last edited by GMC69mnypit; 08-19-2005 at 04:45 PM.

08-23-2005, 01:21 PM	#16
GMC69mnypit !Women...!!!! Join Date: Jan 2005 Location: South of Hays, Kansas Posts: 40	Well, I set the LS1 and tranny in the frame today for a trial fit, I'm really curious if the truck style headers will work. Found these for 2wd newer Silverado's, really thinking about trying them unless someone has been down that road already. http://byunspeed.com/catalog/product...933a4a9425570c What do you think?? Brandon __________________ '69 GMC 1/2T LWB 2WD '02 Silverado 2500HD 4X4 '79 ElCamino SS

08-23-2005, 01:46 PM	#17
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	alot of it depends on the engine placement, depending on what you are planning I moved my engine back about 5-6 inches from the original SBC placement this allowed me to use the ZO6 manifolds without modification. It also helped with the weight (I assume) everythign is tight but fits. I made my own motor mounts and spacers coming up from my front "crossmember" Good luck. Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

08-23-2005, 11:49 PM	#18
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	I really don't think they will work, considering that the manifolds from the trucks won't even fit. But, they could be just perfect. They definatly look like they would be low to the ground... __________________ 1968 C10 build in process TT LSA/6L90e/9"

08-24-2005, 09:14 AM	#20
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Taylor I will gather up some pictures and take some more, basically I moved everything back and suspended it as far back as it would go then I made the mounts to fit. I will see if I can show it in the pictures. I got the manifolds off E-bay and understood they were Z06 they are cast pieces I think some I saw of yours looked fabed, I compared them to pictures in car craft and they looked the same they look like shorter headers except cast iron. I need to get some pictures up here I havent done that since the conversion Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"



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08-24-2005, 09:16 AM	#21
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	I even tucked the AC in the stock place, I havent got the hoses hooked up yet am going to need some different ones but I think they should fit. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

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