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Old 01-19-2010, 06:50 PM   #1
chas350
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what headers for ls swap?

What headers are you guys running with an LS swap in the 67-72 K series?
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Old 01-19-2010, 08:55 PM   #2
msgross
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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
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Old 01-21-2010, 01:24 AM   #3
boostat4500
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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.
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Old 01-23-2010, 08:23 PM   #4
chas350
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Re: what headers for ls swap?

Quote:
Originally Posted by boostat4500 View Post
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
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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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Old 01-24-2010, 07:54 AM   #5
racin69z
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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.

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Old 01-25-2010, 08:28 PM   #6
boostat4500
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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?
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Old 01-25-2010, 08:56 PM   #7
Thealien
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Re: what headers for ls swap?

oil pan, crossmember with the front differential.

I am trying to do it without a lift now!
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Old 01-26-2010, 11:02 AM   #8
racin69z
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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
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Old 01-26-2010, 02:23 PM   #9
chas350
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Re: what headers for ls swap?

Anybody else?
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70 K20 long fleet
98 G3500 work van
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