what headers for ls swap? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chas350 · 01-19-2010, 06:50 PM

What headers are you guys running with an LS swap in the 67-72 K series?

msgross · 01-19-2010, 08:55 PM

not many guys have done this as far as I know.. lots of 2WD guys have...

sorry for the lack of info

boostat4500 · 01-21-2010, 01:24 AM

When I first did my swap, I used Hedman block hugger headers. I then switched to a set of Pacesetter LT's for a 99-06' truck. Those required notching the frame and modifying the collector to clear the shackles. Right now I have a set of Doug Thorley LS swap headers on order. I'm hoping they will fit, even with the frame filled back in. I asked everywhere, including Thorley themselves, and no one knows for sure if they work on a 4X. Doug Thorley did tell me though that to the best of their knowledge, they will.

chas350 · 01-23-2010, 08:23 PM

Quote:

Originally Posted by boostat4500

When I first did my swap, I used Hedman block hugger headers. I then switched to a set of Pacesetter LT's for a 99-06' truck. Those required notching the frame and modifying the collector to clear the shackles. Right now I have a set of Doug Thorley LS swap headers on order. I'm hoping they will fit, even with the frame filled back in. I asked everywhere, including Thorley themselves, and no one knows for sure if they work on a 4X. Doug Thorley did tell me though that to the best of their knowledge, they will.

Thanks! please let me know how they fit.
charlie

racin69z · 01-24-2010, 07:54 AM

I would be afraid to think how to make some fit. I don't see how you could do the swap without a suspension lift. I have an 8" suspension lift on my truck, and the oil pan is only about 8-10" away from the front differential with motor slightly tilted to the back and the transfer case raised 2" off the crossmember.

Lynn

boostat4500 · 01-25-2010, 08:28 PM

racin69z- What are you afraid wouldn't fit? The headers? Where do you think there would be a clearance issue?

Thealien · 01-25-2010, 08:56 PM

oil pan, crossmember with the front differential.

I am trying to do it without a lift now!

racin69z · 01-26-2010, 11:02 AM

When I put mine in, I had my transfer case in the stock position and the stock engine crossmember in. I ran into oil pan clearance issues with the stock engine crossmember. I wound up building a new engine crossmember. I wound up raising the transfer case up 2" to level the motor. I could not have done it without the body lift.

As far as headers, I never really looked because mine go up above the frame. I did measure and the LS motor is about 2" wider than a standard small block.

Lynn

chas350 · 01-26-2010, 02:23 PM

Anybody else?

01-19-2010, 06:50 PM	#1
chas350 Registered User Join Date: Mar 2007 Location: Connecticut Posts: 581	what headers for ls swap? What headers are you guys running with an LS swap in the 67-72 K series? __________________ "I'll Procrastinate Tomorrow" quote by LEEVON 71 K10 long fleet (sons truck) new 370hp 355, sm465 np205, 3.73's 33's 70 K20 long fleet 98 G3500 work van

01-19-2010, 08:55 PM	#2
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: what headers for ls swap? not many guys have done this as far as I know.. lots of 2WD guys have... sorry for the lack of info __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

01-21-2010, 01:24 AM	#3
boostat4500 Registered User Join Date: Aug 2006 Location: Reno, NV Posts: 346	Re: what headers for ls swap? When I first did my swap, I used Hedman block hugger headers. I then switched to a set of Pacesetter LT's for a 99-06' truck. Those required notching the frame and modifying the collector to clear the shackles. Right now I have a set of Doug Thorley LS swap headers on order. I'm hoping they will fit, even with the frame filled back in. I asked everywhere, including Thorley themselves, and no one knows for sure if they work on a 4X. Doug Thorley did tell me though that to the best of their knowledge, they will. __________________ 1971 Suburban 4x4, LQ4 6.0L, 4L80E, etc.

01-24-2010, 07:54 AM	#5
racin69z Registered User Join Date: Sep 2007 Location: jackson MO Posts: 143	Re: what headers for ls swap? I would be afraid to think how to make some fit. I don't see how you could do the swap without a suspension lift. I have an 8" suspension lift on my truck, and the oil pan is only about 8-10" away from the front differential with motor slightly tilted to the back and the transfer case raised 2" off the crossmember. Lynn

01-25-2010, 08:28 PM	#6
boostat4500 Registered User Join Date: Aug 2006 Location: Reno, NV Posts: 346	Re: what headers for ls swap? racin69z- What are you afraid wouldn't fit? The headers? Where do you think there would be a clearance issue? __________________ 1971 Suburban 4x4, LQ4 6.0L, 4L80E, etc.

01-25-2010, 08:56 PM	#7
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,120	Re: what headers for ls swap? oil pan, crossmember with the front differential. I am trying to do it without a lift now! __________________ Click on my Not really a build thread, yet NOT SO RUST FREE RUST FREE BLAZER LS ENGINE SWAP INFORMATION THREAD BOLT RESTORATIONS 4l60 to an NP205

01-26-2010, 11:02 AM	#8
racin69z Registered User Join Date: Sep 2007 Location: jackson MO Posts: 143	Re: what headers for ls swap? When I put mine in, I had my transfer case in the stock position and the stock engine crossmember in. I ran into oil pan clearance issues with the stock engine crossmember. I wound up building a new engine crossmember. I wound up raising the transfer case up 2" to level the motor. I could not have done it without the body lift. As far as headers, I never really looked because mine go up above the frame. I did measure and the LS motor is about 2" wider than a standard small block. Lynn

01-26-2010, 02:23 PM	#9
chas350 Registered User Join Date: Mar 2007 Location: Connecticut Posts: 581	Re: what headers for ls swap? Anybody else? __________________ "I'll Procrastinate Tomorrow" quote by LEEVON 71 K10 long fleet (sons truck) new 370hp 355, sm465 np205, 3.73's 33's 70 K20 long fleet 98 G3500 work van



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