The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain > LSx Swaps

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-08-2014, 04:04 PM   #1
DWilbur
Registered User
 
Join Date: Aug 2013
Location: San Jose Ca
Posts: 965
1971 K20 LS 5.3L Swap issue headers

I have installed my LS 5.3 L in to 1971 K20 4X4 truck and I'm having issue with the headers fitting Dough Throly THY 323. I talked to Dough Thorly tech prior to buying the headers to confirm that they will fit my application. they confirmed they fit. Well they don't even come close. I would like to use headers, does any one know what headers will fit. I have a Dirty Dingo motor mount installed. with 1987 bell housing with hydraulic clutch.
Attached Images
   
DWilbur is offline   Reply With Quote
Old 07-09-2014, 12:27 AM   #2
71chevystep4x4
Registered User
 
71chevystep4x4's Avatar
 
Join Date: Sep 2012
Location: Milwaukie OR
Posts: 135
Re: 1971 K20 LS 5.3L Swap issue headers

Hooker block hugger shorties #2312
71chevystep4x4 is offline   Reply With Quote
Old 07-09-2014, 12:44 PM   #3
DWilbur
Registered User
 
Join Date: Aug 2013
Location: San Jose Ca
Posts: 965
Re: 1971 K20 LS 5.3L Swap issue headers

Quote:
Originally Posted by 71chevystep4x4 View Post
Hooker block hugger shorties #2312
Thanks for the info. would you by chance have pictures of them installed.
DWilbur is offline   Reply With Quote
Old 07-09-2014, 12:53 PM   #4
BR3W CITY
meowMEOWmeowMEOW
 
BR3W CITY's Avatar
 
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
Re: 1971 K20 LS 5.3L Swap issue headers

The frame areas look minimal, I'd just clearance out the problem area. I'm not running a manual, but some "massaging" of the mounting ears on the auto's isn't uncommon.
__________________
'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING

MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD
BR3W CITY is offline   Reply With Quote
Old 07-09-2014, 02:05 PM   #5
DWilbur
Registered User
 
Join Date: Aug 2013
Location: San Jose Ca
Posts: 965
Re: 1971 K20 LS 5.3L Swap issue headers

Quote:
Originally Posted by BR3W CITY View Post
The frame areas look minimal, I'd just clearance out the problem area. I'm not running a manual, but some "massaging" of the mounting ears on the auto's isn't uncommon.
I would have to cut out the hole top flange of the frame for the right and left side. The left side the collector runs right into the hydraulic clutch bracket on the side of the bell housing.
DWilbur is offline   Reply With Quote
Old 07-12-2014, 11:52 PM   #6
67Steven
Registered User
 
67Steven's Avatar
 
Join Date: Mar 2007
Location: Oregon City
Posts: 228
Re: 1971 K20 LS 5.3L Swap issue headers

I am running DT headers and I did need to clearance the frame, just a small scallop on each side, but I reinforced the inside area, no problems so far.
__________________
1972 Blazer build: http://67-72chevytrucks.com/vboard/s...d.php?t=615744
67Steven is offline   Reply With Quote
Old 07-17-2014, 07:13 PM   #7
DWilbur
Registered User
 
Join Date: Aug 2013
Location: San Jose Ca
Posts: 965
Re: 1971 K20 LS 5.3L Swap issue headers

Quote:
Originally Posted by 67Steven View Post
I am running DT headers and I did need to clearance the frame, just a small scallop on each side, but I reinforced the inside area, no problems so far.
I checked out your build thread a couple of time it looks like your engine sits about 1 higher than mine. so the DT headers fit better. your using an auto transmission. I still have problems with the hydraulic clutch bracket that is molded in to the bell housing I would like to use.
DWilbur is offline   Reply With Quote
Old 08-23-2014, 07:09 PM   #8
DWilbur
Registered User
 
Join Date: Aug 2013
Location: San Jose Ca
Posts: 965
Re: 1971 K20 LS 5.3L Swap issue headers

After trying 3 set of headers finally the Headman block huger headers will fit only trimming 1.4" out of the top rail of the frame on each side.
DWilbur is offline   Reply With Quote
Old 06-07-2016, 05:35 PM   #9
preciador6
Registered User
 
Join Date: Dec 2013
Location: So Cal
Posts: 684
Re: 1971 K20 LS 5.3L Swap issue headers

So it dont matter if i buy DD or Pac fAb im still going to have trouble with headers?
preciador6 is offline   Reply With Quote
Old 06-07-2016, 11:02 PM   #10
DWilbur
Registered User
 
Join Date: Aug 2013
Location: San Jose Ca
Posts: 965
Re: 1971 K20 LS 5.3L Swap issue headers

That's what i found out. I ended up using the Dough Thorley headders and had to modify the 2 front tubes to clear the frame.
DWilbur is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:42 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com