Big tube ls headers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mac72 · 07-16-2010, 07:47 PM

If any of you guys are interested Shon is trying to get enough people together for some 1 7/8"primary 3" collector doug thorley ls swap headers.They will be the same design as the 324-yc w/ bigger primary's
Here's the thread. http://67-72chevytrucks.com/vboard/s...d.php?t=411924
If you want a look at the 324's heres the thread
http://67-72chevytrucks.com/vboard/s...d.php?t=374004

85burb · 07-16-2010, 07:53 PM

Would be really interested if they made one that fit 73-87 trucks. Have asked him a few times and no answers.

Jim_PA · 07-21-2010, 12:14 PM

I'm probably going to end up trying these soon:
http://www.texas-speed.com/shop/item...d=899&catid=45

But if the fit is way off, I might have to wait on the 1 7/8 Thorley headers.

Wonder why they made them so small (1 5/8") to start with?

mac72 · 07-21-2010, 12:29 PM

Quote:

Originally Posted by Jim_PA

I'm probably going to end up trying these soon:
http://www.texas-speed.com/shop/item...d=899&catid=45

But if the fit is way off, I might have to wait on the 1 7/8 Thorley headers.

Wonder why they made them so small (1 5/8") to start with?

Jim are those f body headers?

Jim_PA · 07-21-2010, 01:05 PM

Quote:

Originally Posted by mac72

Jim are those f body headers?

Yeah, the 98-02 style. They look like they might fit from the pics, except maybe the passenger side collector area.

It shouldn't be too long and I'll be ordering a set.

mac72 · 07-21-2010, 01:56 PM

Jim The only problem w/ f body headers is one of the collectors doesnt exit straight or parallel w/ the other.I know guys have made them fit though w/ clearencing the frame etc.. Their just not for me. The reason they made the DT's in 1&5/8 is everone was using 5.3's & the 6.0 was in it's first or second year.The Ls platform caught on so fast nobody anticipated it. Within 2 years their building 454 small blocks who would of thought it!

85burb · 07-21-2010, 08:10 PM

I will be trying camaro headers also. The ones i am getting are 170 for the set of long tubes. Dougs still not making some for 73-87..

Jim_PA · 07-22-2010, 09:55 AM

I just got a set of used coated Flowtech F-body headers with 2 brand new 3" magnaflow mufflers for $250. Couldn't pass it up.

They are "only" 1 3/4" but at least I'll be able to get some sort of exhaust system going on this thing.

Hopefully they don't need modified too hard to make them fit.

mac72 · 07-22-2010, 12:10 PM

I would'nt either ,thats a hell of a deal

Jim_PA · 07-30-2010, 08:26 AM

Flowtech F-body LS1 headers fit on the passenger side beautifully.

Drivers side, won't work at all without either completely crushing 2 of the pipes, or relocating them, as I plan on doing... With ECE mounts, 1 pipe is all up in the control arm's face, and another pipe lays straight against the back of the front crossmember.

Kind of what I was expecting, but I think I can re-route a few of the pipes to make them work at least a few years while I wait for the perfect fitting header in 1 7/8 LT's.

If someone would take the passenger side Flowtech LS1 F-body header, and basically make the exact same thing, but for the drivers side, it would be an awesome fit.

mac72 · 07-30-2010, 01:15 PM

How about a few pics Jim

Jim_PA · 07-30-2010, 02:46 PM

Yeah, I'll get some eventually

I work at night on the thing, and generally while I'm in GO! mode, the camera takes a back seat....

Once I get them all situated, I'll put up some pics, but overall, unless you get them very cheap like I did, I would highly recommend not attempting to use them.

Super73 · 08-05-2010, 03:52 PM

I have been saying for a few years now that the Edelbrock 1 3/4 stepped to 1 7/8 4th gen F-body headers fit. They have been in my 63 for at least 3 years now.

Jim_PA · 08-05-2010, 04:06 PM

Every F-body header I've seen has the 1st pipe going straight down almost in-line with the 2nd exhaust port. That would probably work if your engine is siting back as far as you can possibly make it.

Super73 · 08-05-2010, 05:09 PM

My motor is decently pushed back, but it doesn't seem any more than my buddies stock location on his 327.. Maybe I set it back further than I thought..

Jim_PA · 08-05-2010, 05:54 PM

If mine was back 3" I'm fairly certain the flowtech f-body headers I tried would fit. They'd still be a pain because of how those exited though

c10seconds · 08-15-2010, 06:05 PM

I just bought some stainless kooks 1 7/8 3'collector 98-02 fbody headers. I haven't mocked them up but im wondering if they'll fit any better than these other headers you guys are using. Has anybody tried these?

Super73 · 08-15-2010, 10:14 PM

Hope they work for you.. They are some pricey pieces..

07-16-2010, 07:47 PM	#1
mac72 Registered User Join Date: Dec 2008 Location: port charlotte,florida Posts: 384	Big tube ls headers If any of you guys are interested Shon is trying to get enough people together for some 1 7/8"primary 3" collector doug thorley ls swap headers.They will be the same design as the 324-yc w/ bigger primary's Here's the thread. http://67-72chevytrucks.com/vboard/s...d.php?t=411924 If you want a look at the 324's heres the thread http://67-72chevytrucks.com/vboard/s...d.php?t=374004

07-16-2010, 07:53 PM	#2
85burb Registered User Join Date: Dec 2009 Location: lindale,tx Posts: 2,373	Re: Big tube ls headers Would be really interested if they made one that fit 73-87 trucks. Have asked him a few times and no answers. __________________ 82 c10 5.3/4l60 84 c20 5.3/sm465 85 chevy k10 suburban LQ4/4l60 91 chevy c10 suburban Lsa 5.3/4l60 2017 Silverado whipple 5.3 1964 Vw beetle 1974 vw beetle

07-21-2010, 12:14 PM	#3
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Big tube ls headers I'm probably going to end up trying these soon: http://www.texas-speed.com/shop/item...d=899&catid=45 But if the fit is way off, I might have to wait on the 1 7/8 Thorley headers. Wonder why they made them so small (1 5/8") to start with? Last edited by Jim_PA; 07-21-2010 at 12:15 PM.

07-21-2010, 01:56 PM	#6
mac72 Registered User Join Date: Dec 2008 Location: port charlotte,florida Posts: 384	Re: Big tube ls headers Jim The only problem w/ f body headers is one of the collectors doesnt exit straight or parallel w/ the other.I know guys have made them fit though w/ clearencing the frame etc.. Their just not for me. The reason they made the DT's in 1&5/8 is everone was using 5.3's & the 6.0 was in it's first or second year.The Ls platform caught on so fast nobody anticipated it. Within 2 years their building 454 small blocks who would of thought it!

07-21-2010, 08:10 PM	#7
85burb Registered User Join Date: Dec 2009 Location: lindale,tx Posts: 2,373	Re: Big tube ls headers I will be trying camaro headers also. The ones i am getting are 170 for the set of long tubes. Dougs still not making some for 73-87.. __________________ 82 c10 5.3/4l60 84 c20 5.3/sm465 85 chevy k10 suburban LQ4/4l60 91 chevy c10 suburban Lsa 5.3/4l60 2017 Silverado whipple 5.3 1964 Vw beetle 1974 vw beetle

07-22-2010, 09:55 AM	#8
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Big tube ls headers I just got a set of used coated Flowtech F-body headers with 2 brand new 3" magnaflow mufflers for $250. Couldn't pass it up. They are "only" 1 3/4" but at least I'll be able to get some sort of exhaust system going on this thing. Hopefully they don't need modified too hard to make them fit.

07-22-2010, 12:10 PM	#9
mac72 Registered User Join Date: Dec 2008 Location: port charlotte,florida Posts: 384	Re: Big tube ls headers I would'nt either ,thats a hell of a deal

07-30-2010, 08:26 AM	#10
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Big tube ls headers Flowtech F-body LS1 headers fit on the passenger side beautifully. Drivers side, won't work at all without either completely crushing 2 of the pipes, or relocating them, as I plan on doing... With ECE mounts, 1 pipe is all up in the control arm's face, and another pipe lays straight against the back of the front crossmember. Kind of what I was expecting, but I think I can re-route a few of the pipes to make them work at least a few years while I wait for the perfect fitting header in 1 7/8 LT's. If someone would take the passenger side Flowtech LS1 F-body header, and basically make the exact same thing, but for the drivers side, it would be an awesome fit. Last edited by Jim_PA; 07-30-2010 at 08:27 AM.

07-30-2010, 01:15 PM	#11
mac72 Registered User Join Date: Dec 2008 Location: port charlotte,florida Posts: 384	Re: Big tube ls headers How about a few pics Jim

07-30-2010, 02:46 PM	#12
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Big tube ls headers Yeah, I'll get some eventually I work at night on the thing, and generally while I'm in GO! mode, the camera takes a back seat.... Once I get them all situated, I'll put up some pics, but overall, unless you get them very cheap like I did, I would highly recommend not attempting to use them.

08-05-2010, 03:52 PM	#13
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: Big tube ls headers I have been saying for a few years now that the Edelbrock 1 3/4 stepped to 1 7/8 4th gen F-body headers fit. They have been in my 63 for at least 3 years now. __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

08-05-2010, 04:06 PM	#14
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Big tube ls headers Every F-body header I've seen has the 1st pipe going straight down almost in-line with the 2nd exhaust port. That would probably work if your engine is siting back as far as you can possibly make it.

08-05-2010, 05:09 PM	#15
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: Big tube ls headers My motor is decently pushed back, but it doesn't seem any more than my buddies stock location on his 327.. Maybe I set it back further than I thought.. __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

08-05-2010, 05:54 PM	#16
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Big tube ls headers If mine was back 3" I'm fairly certain the flowtech f-body headers I tried would fit. They'd still be a pain because of how those exited though

08-15-2010, 06:05 PM	#17
c10seconds Registered User Join Date: Oct 2009 Location: gilbert,AZ Posts: 947	Re: Big tube ls headers I just bought some stainless kooks 1 7/8 3'collector 98-02 fbody headers. I haven't mocked them up but im wondering if they'll fit any better than these other headers you guys are using. Has anybody tried these?



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08-15-2010, 10:14 PM	#18
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: Big tube ls headers Hope they work for you.. They are some pricey pieces.. __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

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