Thorley LS Swap Headers Q - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jamesjones · 01-16-2014, 01:04 PM

Is anybody who has these able to give the dimensions of the headers? I'm looking for some headers for my swap but space is super tight. The engine in my '72 blazer was orginally mounted in the rear most location and I have some custom made engine mounts. I'd like to have a decent idea about them fitting before I drop the coin on them.

I'll snap some pics when I get home to give an idea of the space I'm working with.

chevyguy_72 · 01-16-2014, 02:03 PM

So your engine is still in the rear mount location or its moved forward?

jamesjones · 01-16-2014, 02:54 PM

Quote:

Originally Posted by chevyguy_72

So your engine is still in the rear mount location or its moved forward?

It's still in the rear mount position. I meant I say the old engine was mounted in that position so the new mounts are based on that position.

chevyguy_72 · 01-16-2014, 02:57 PM

ok... mine is mounted in the rear holes now... and the DT headers fit fine... but you also have to consider the perches and mounts you are using... i currently have CPP sheetmetal perches with dirty dingo slider mounts...
as seen here:
http://67-72chevytrucks.com/vboard/s...8&postcount=14

jamesjones · 01-16-2014, 08:12 PM

Here's pics of the space I have on the driver's side...

jamesjones · 01-16-2014, 08:14 PM

Here's the space I have on the passenger's side...

**truckdude239** · 01-16-2014, 09:06 PM

Trailblazer ss manifolds eould probely clear

jamesjones · 01-17-2014, 08:43 PM

Quote:

Originally Posted by truckdude239

Trailblazer ss manifolds eould probely clear

Yeah, after taking a closer look at those manifolds and the space I have to work with, I honestly think that's my best option. I'm gong to order a set and if they work, I'll just get them ceramic coated and call it a day.

**truckdude239** · 01-17-2014, 09:12 PM

I used them on my 71 clered great and i coukd use the stock downpipes. Also i only had 140 buxs in manifolds instead of 700 for swap headers

**Hart_Rod** · 01-18-2014, 11:31 AM

2010+ Camaro manifolds shoul work.

jamesjones · 01-18-2014, 02:03 PM

Quote:

Originally Posted by Hart_Rod

2010+ Camaro manifolds shoul work.

Do those flow better than the TBSS manifolds?

**Hart_Rod** · 01-18-2014, 02:37 PM

There are some pictures in my shifted thread.

jamesjones · 02-09-2014, 11:27 PM

Well, I decided it wasn't worth the $600 risk for the DTs to not fit and bought a set of 2010 Camaro manifolds off of ebay.

66LSx · 02-09-2014, 11:45 PM

FOR OTHER MEMBERS WHO SEARCH UPON THIS

You need to check to see WHAT DT header you are using..

322 (60-66) and 323 (67-72) headers exit with a downward angle towards the ground.

These are both 1-7/8 primaries

324 exits straight out... slightly longer... and is only 1-5/8" primaries.

I have Doug Throley 324 headers in my 66 (although there made fora 67-72)

Differences between LS swap c-10 headers

322 & 323

They fit with alot of room in my 1966 c10... you should have all the room in the world for your 67-72..even at the firewall... but your REALLY far back there...

jamesjones · 02-10-2014, 12:06 AM

Yeah, the more I looked at pictures of them installed and compared them to the placement of my engine, I just don't see them fitting, I think the Camaro manifolds are going to be a tight fit. I just want to get it up and running and then I'll have some custom headers made down the line.

66LSx · 02-10-2014, 12:10 AM

Quote:

Originally Posted by jamesjones

Yeah, the more I looked at pictures of them installed and compared them to the placement of my engine, I just don't see them fitting, I think the Camaro manifolds are going to be a tight fit. I just want to get it up and running and then I'll have some custom headers made down the line.

The more and more I look at your picture..... the more I think cylinder #6 would hit.... this is the passenger side tube that goes up and over #8... i think it would come down and smack the lower corner of the doghouse.

akdg87 · 02-10-2014, 03:57 AM

I did an install on a 70 k10(with motor slid back as far as possible) and the issue I ran into with the Doug Thorleys was the o2 sensor bung placement on the passenger side. It was angled at the frame rail and there was no way possible to install it.

jamesjones · 02-17-2014, 09:51 PM

Here's the 2010 Camaro manifolds for those interested...

jamesjones · 02-17-2014, 09:53 PM

Here's the fitment on the passenger's side...

jamesjones · 02-17-2014, 09:57 PM

Here's the fitment on the driver's side...

I'm going to need to take a sledge hammer to the firewall to make room for the last header bolt...

01-16-2014, 01:04 PM	#1
jamesjones Freakin Awesome! Join Date: Jul 2003 Location: San Diego Posts: 482	Thorley LS Swap Headers Q Is anybody who has these able to give the dimensions of the headers? I'm looking for some headers for my swap but space is super tight. The engine in my '72 blazer was orginally mounted in the rear most location and I have some custom made engine mounts. I'd like to have a decent idea about them fitting before I drop the coin on them. I'll snap some pics when I get home to give an idea of the space I'm working with. __________________ 1972 K5 Blazer - LQ4/TH350/NP205 - Long Travel Suspension - Hooptee

01-16-2014, 02:03 PM	#2
chevyguy_72 Vintage Evil Join Date: Aug 2005 Location: Hastings, Nebraska Posts: 956	Re: Thorley LS Swap Headers Q So your engine is still in the rear mount location or its moved forward?

01-16-2014, 02:57 PM	#4
chevyguy_72 Vintage Evil Join Date: Aug 2005 Location: Hastings, Nebraska Posts: 956	Re: Thorley LS Swap Headers Q ok... mine is mounted in the rear holes now... and the DT headers fit fine... but you also have to consider the perches and mounts you are using... i currently have CPP sheetmetal perches with dirty dingo slider mounts... as seen here: http://67-72chevytrucks.com/vboard/s...8&postcount=14

01-16-2014, 08:12 PM	#5
jamesjones Freakin Awesome! Join Date: Jul 2003 Location: San Diego Posts: 482	Re: Thorley LS Swap Headers Q Here's pics of the space I have on the driver's side... Attached Images __________________ 1972 K5 Blazer - LQ4/TH350/NP205 - Long Travel Suspension - Hooptee

01-16-2014, 09:06 PM	#7
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: Thorley LS Swap Headers Q Trailblazer ss manifolds eould probely clear __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

01-16-2014, 08:14 PM	#6
jamesjones Freakin Awesome! Join Date: Jul 2003 Location: San Diego Posts: 482	Re: Thorley LS Swap Headers Q Here's the space I have on the passenger's side... Attached Images __________________ 1972 K5 Blazer - LQ4/TH350/NP205 - Long Travel Suspension - Hooptee

01-17-2014, 09:12 PM	#9
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: Thorley LS Swap Headers Q I used them on my 71 clered great and i coukd use the stock downpipes. Also i only had 140 buxs in manifolds instead of 700 for swap headers __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

01-18-2014, 11:31 AM	#10
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: Thorley LS Swap Headers Q 2010+ Camaro manifolds shoul work. __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

01-18-2014, 02:37 PM	#12
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: Thorley LS Swap Headers Q There are some pictures in my shifted thread. __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

02-09-2014, 11:27 PM	#13
jamesjones Freakin Awesome! Join Date: Jul 2003 Location: San Diego Posts: 482	Re: Thorley LS Swap Headers Q Well, I decided it wasn't worth the $600 risk for the DTs to not fit and bought a set of 2010 Camaro manifolds off of ebay. __________________ 1972 K5 Blazer - LQ4/TH350/NP205 - Long Travel Suspension - Hooptee

02-09-2014, 11:45 PM	#14
66LSx Registered User Join Date: Nov 2013 Location: Green Bay, WI Posts: 435	Re: Thorley LS Swap Headers Q FOR OTHER MEMBERS WHO SEARCH UPON THIS You need to check to see WHAT DT header you are using.. 322 (60-66) and 323 (67-72) headers exit with a downward angle towards the ground. These are both 1-7/8 primaries 324 exits straight out... slightly longer... and is only 1-5/8" primaries. I have Doug Throley 324 headers in my 66 (although there made fora 67-72) Differences between LS swap c-10 headers 322 & 323 They fit with alot of room in my 1966 c10... you should have all the room in the world for your 67-72..even at the firewall... but your REALLY far back there... __________________ 1966 C10 SWB Fleet 5.3L LM7 Vortec / 4L60e Swap 1966 C10 w/ 5.3L/4L60e Build Thread 2012 GMC Sierra 5.3L 4x4 CCSB

02-10-2014, 12:06 AM	#15
jamesjones Freakin Awesome! Join Date: Jul 2003 Location: San Diego Posts: 482	Re: Thorley LS Swap Headers Q Yeah, the more I looked at pictures of them installed and compared them to the placement of my engine, I just don't see them fitting, I think the Camaro manifolds are going to be a tight fit. I just want to get it up and running and then I'll have some custom headers made down the line. __________________ 1972 K5 Blazer - LQ4/TH350/NP205 - Long Travel Suspension - Hooptee

02-10-2014, 03:57 AM	#17
akdg87 Registered User Join Date: Sep 2013 Location: fairbanks, ak Posts: 339	Re: Thorley LS Swap Headers Q I did an install on a 70 k10(with motor slid back as far as possible) and the issue I ran into with the Doug Thorleys was the o2 sensor bung placement on the passenger side. It was angled at the frame rail and there was no way possible to install it. __________________ build thread 1955 cameo turbo lsx 1993 K1500 Blazer 5.3/4L80e 2009 CTSV Sedan

02-17-2014, 09:51 PM	#18
jamesjones Freakin Awesome! Join Date: Jul 2003 Location: San Diego Posts: 482	Re: Thorley LS Swap Headers Q Here's the 2010 Camaro manifolds for those interested... __________________ 1972 K5 Blazer - LQ4/TH350/NP205 - Long Travel Suspension - Hooptee

02-17-2014, 09:53 PM	#19
jamesjones Freakin Awesome! Join Date: Jul 2003 Location: San Diego Posts: 482	Re: Thorley LS Swap Headers Q Here's the fitment on the passenger's side... __________________ 1972 K5 Blazer - LQ4/TH350/NP205 - Long Travel Suspension - Hooptee



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02-17-2014, 09:57 PM	#20
jamesjones Freakin Awesome! Join Date: Jul 2003 Location: San Diego Posts: 482	Re: Thorley LS Swap Headers Q Here's the fitment on the driver's side... I'm going to need to take a sledge hammer to the firewall to make room for the last header bolt... __________________ 1972 K5 Blazer - LQ4/TH350/NP205 - Long Travel Suspension - Hooptee

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