Lt-1 Engine Installers-header Questions! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wildmanaaron · 10-05-2003, 10:13 PM

It's almost time to put my motor in my 67 2wd Truck and I had some questions about what other LT-1 installers have done about headers. The LT-1 motors have D-shaped ports inlike those of early non-fuel injected motors. I have yet to see any manufacturer make them for D-shaped heads, except for one company who make block-hugger headers. I am not certain that these would fit on a 67-72 2wd Truck or not. A man who works for Hooker recomended that I use the factory style 67-87 headers with at least 1 3/4" pimary tubes to compensate for the type of ports that the LT-1 motor uses. I also don't know if this would be okay or not.

So if you have installed a 93-97 Lt-1 motor in your Truck, please let me know what you did about exhaust manifolds or headers. Any help or suggestion would be appreciated alot!!

wildmanaaron · 10-06-2003, 10:08 AM

TTT

Ackattack · 10-06-2003, 10:51 AM

I was thinking of doing this swap and planned on using regular small block headers.

Another option is to use the factory LT1 manifolds.

wildmanaaron · 10-06-2003, 01:08 PM

The factory manifolds are not an option. The engine bay is all chrome or body colored. The factory manifolds might work on a daily driver, but no my truck.

A 1 3/4" primary tube header willl only work.

mcmlxix · 10-06-2003, 03:03 PM

F-Body headers might work or the 94-96 Impala SS.
SLP makes headers for the LT-1

**lock** · 10-06-2003, 04:10 PM

Is there any massaging of the firewall or transmission tunnel needed to swap in a LT1/4L60E setup? I know the tranny mount needs attenten but is anything else needed to install this setup?

*rickspickuppart* · 10-06-2003, 04:50 PM

we are using a set of short block hugers on a 55 car that we are putting in an LT1

dwaite72lnghrn · 10-06-2003, 07:37 PM

I thought LT1 and LS1 had spaced exhaust ports and the old style headers would not fit?

mcmlxix · 10-06-2003, 11:19 PM

I know someone who was using long tube mid 70's camaro headers on the LT-1 in a 96 Impala SS ... They were spaced correctly and they were larger then the D port ...

minibike · 10-07-2003, 08:14 AM

Street and Perfomance makes shorty headers. The spacing on the LT1 is the same as other small blocks. I called Headman and they said they had some that fit...not sure if the ports are correct though. The stock manifolds flow pretty good...I stayed with them. If you are going to use the manifolds, be sure and get the exhaust flanges from the doner car. They are unavailable anywhere else, unless you buy the whole $600 Y-pipe for a camaro. I made mine out of plate steel.

jay-dawg · 10-07-2003, 06:29 PM

ahh. the god has spoken.

jay

wdz28ss · 10-11-2003, 11:09 PM

um uh, i just used the headers for a standard 350....They seem to work just fine. But hey, dont forget your bung holes.

68c10owner · 10-11-2003, 11:19 PM

I`m also thinking about do this swap. Can the stock tank be modified for the efi or do I need a custom tank? If I can use the stock tank, who can I send it to to set it up for efi?

wildmanaaron · 10-12-2003, 12:41 PM

GAS TANK-I would never leave a gas tank inside the cab. I purchase a metal Blazer gas tank kit. Then cut the filler off the side and moved it to the top of the tank. Then I purchased a EFI fuel pump ring and attached it to the top of the tank. Or you can spend upwards off $500-$700 to have a aluminum tank with the pump assembly already installed!

wdz28ss · 10-12-2003, 12:47 PM

I modified the stock tank for efi. I put an external pump on and ran a few lines.

minibike · 10-13-2003, 08:10 AM

I had an aluminum tank built around a stock camaro pump from a junkyard. I got the whole tank from the junkyard, cut out the portion where the pump/sending unit was, and took that along with a drawing to a local boat builder...$225

10-05-2003, 10:13 PM	#1
wildmanaaron Registered User Join Date: Mar 2002 Location: Bowling Green, KY Posts: 396	Lt-1 Engine Installers-header Questions! It's almost time to put my motor in my 67 2wd Truck and I had some questions about what other LT-1 installers have done about headers. The LT-1 motors have D-shaped ports inlike those of early non-fuel injected motors. I have yet to see any manufacturer make them for D-shaped heads, except for one company who make block-hugger headers. I am not certain that these would fit on a 67-72 2wd Truck or not. A man who works for Hooker recomended that I use the factory style 67-87 headers with at least 1 3/4" pimary tubes to compensate for the type of ports that the LT-1 motor uses. I also don't know if this would be okay or not. So if you have installed a 93-97 Lt-1 motor in your Truck, please let me know what you did about exhaust manifolds or headers. Any help or suggestion would be appreciated alot!!

10-06-2003, 10:51 AM	#3
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,524	I was thinking of doing this swap and planned on using regular small block headers. Another option is to use the factory LT1 manifolds. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

10-06-2003, 03:03 PM	#5
mcmlxix Collector of Projects Join Date: Apr 2003 Location: Las Vegas Posts: 3,106	F-Body headers might work or the 94-96 Impala SS. SLP makes headers for the LT-1 __________________ Rich 1972 K5 Blazer CST Click HERE D60 BIG BRAKE UPGRADE Click HERE

10-06-2003, 04:10 PM	#6
lock Insert funny comment. Join Date: Dec 1999 Location: Concord NC Posts: 621	Is there any massaging of the firewall or transmission tunnel needed to swap in a LT1/4L60E setup? I know the tranny mount needs attenten but is anything else needed to install this setup? __________________ ------------ - Mark -My Build Thread... -68 C10, LT1 - Undergoing Frame off resto -86 IROC-Z T72 turbo 355, M6 -70 Camaro http://www.iroc-ss.com

10-06-2003, 07:37 PM	#8
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	I thought LT1 and LS1 had spaced exhaust ports and the old style headers would not fit? __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

10-06-2003, 10:08 AM	#2
wildmanaaron Registered User Join Date: Mar 2002 Location: Bowling Green, KY Posts: 396	TTT

10-06-2003, 01:08 PM	#4
wildmanaaron Registered User Join Date: Mar 2002 Location: Bowling Green, KY Posts: 396	The factory manifolds are not an option. The engine bay is all chrome or body colored. The factory manifolds might work on a daily driver, but no my truck. A 1 3/4" primary tube header willl only work.

10-06-2003, 04:50 PM	#7
rickspickuppart Account Suspended Join Date: Jul 2003 Posts: 1,284	we are using a set of short block hugers on a 55 car that we are putting in an LT1

10-06-2003, 11:19 PM	#9
mcmlxix Collector of Projects Join Date: Apr 2003 Location: Las Vegas Posts: 3,106	I know someone who was using long tube mid 70's camaro headers on the LT-1 in a 96 Impala SS ... They were spaced correctly and they were larger then the D port ... __________________ Rich 1972 K5 Blazer CST Click HERE D60 BIG BRAKE UPGRADE Click HERE

10-07-2003, 08:14 AM	#10
minibike Registered User Join Date: Jun 2002 Location: Lafayette, LA Posts: 500	Street and Perfomance makes shorty headers. The spacing on the LT1 is the same as other small blocks. I called Headman and they said they had some that fit...not sure if the ports are correct though. The stock manifolds flow pretty good...I stayed with them. If you are going to use the manifolds, be sure and get the exhaust flanges from the doner car. They are unavailable anywhere else, unless you buy the whole $600 Y-pipe for a camaro. I made mine out of plate steel. __________________ 69 SWB LT1/4L60E www.classicplace.com

10-07-2003, 06:29 PM	#11
jay-dawg chevelito Join Date: Jun 2001 Location: Honolulu, HI USA Posts: 1,609	ahh. the god has spoken. jay __________________ New deadline...when my son can drive. Aloha from Honolulu, HI

10-11-2003, 11:09 PM	#12
wdz28ss Registered User Join Date: Sep 2002 Location: Clinton, Ut Posts: 230	um uh, i just used the headers for a standard 350....They seem to work just fine. But hey, dont forget your bung holes. __________________ '72 Cheyenne super, short-fleet, air-tilt-tach, fuel injected LT1, 700r4, 3.08 posi, 4WDB, step notched and bagged. "the one i wish i still had"

10-11-2003, 11:19 PM	#13
68c10owner Registered User Join Date: Oct 2003 Location: Carmichael, California Posts: 3,011	I`m also thinking about do this swap. Can the stock tank be modified for the efi or do I need a custom tank? If I can use the stock tank, who can I send it to to set it up for efi? __________________ Anthony

10-12-2003, 12:41 PM	#14
wildmanaaron Registered User Join Date: Mar 2002 Location: Bowling Green, KY Posts: 396	GAS TANK-I would never leave a gas tank inside the cab. I purchase a metal Blazer gas tank kit. Then cut the filler off the side and moved it to the top of the tank. Then I purchased a EFI fuel pump ring and attached it to the top of the tank. Or you can spend upwards off $500-$700 to have a aluminum tank with the pump assembly already installed!

10-12-2003, 12:47 PM	#15
wdz28ss Registered User Join Date: Sep 2002 Location: Clinton, Ut Posts: 230	I modified the stock tank for efi. I put an external pump on and ran a few lines. __________________ '72 Cheyenne super, short-fleet, air-tilt-tach, fuel injected LT1, 700r4, 3.08 posi, 4WDB, step notched and bagged. "the one i wish i still had"



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10-13-2003, 08:10 AM	#16
minibike Registered User Join Date: Jun 2002 Location: Lafayette, LA Posts: 500	I had an aluminum tank built around a stock camaro pump from a junkyard. I got the whole tank from the junkyard, cut out the portion where the pump/sending unit was, and took that along with a drawing to a local boat builder...$225 __________________ 69 SWB LT1/4L60E www.classicplace.com

Register or Log In To remove these advertisements.