L59 (flex fuel) Motor good for swap? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mismith · 11-27-2022, 02:59 PM

I’m about ready to finally do the LS swap on a couple different ‘66 C10’s. One of the recent donors I’ve found is a 2005 L59 (Z in 8th digit of VIN).

The price is decent and it’s still in the Suburban and it runs excellent. I get everything I might need to go with it off this vehicle.

I can’t find any real concrete answers online if this is a good version? I understand the rails, injectors, and even some connectors on harness are specific to the L59.

Should I pass on this one and look for another LM7? I appreciate any opinions and advice.

Thanks,
Michael

verdell · 11-28-2022, 12:03 PM

I'm not sure your intended use for the C10 you're swapping but there's nothing wrong with that L59 set up at all. I'd use it

**mattfranklin** · 11-28-2022, 12:18 PM

I don't have any insider information on this particular engine, but in general the flex-fuel vehicles have better materials in the fuel tanks, pumps, lines, and injectors to resist any negative effects of ethanol. Plus they have an ECM with more freedom to adjust the A/F and possibly (probably?) a sensor to detect how much ethanol is in the gas.

If it were me I wouldn't worry about it. And I'd also create a YouTube on my steps and progress because a lot of those motors are out there.

mismith · 11-28-2022, 04:49 PM

Thanks, this particular motor has 269K miles. Saw some maintenance records in vehicle, looks like it was serviced regularly. Like I said it ran really smooth, no smoke. I know that’s a lot of miles though…$850 with harness, accessories, ecm, pedal and TAC module.

He also has an ‘02 LM7 with 230k miles for same price, didn’t idle very well but acceleration sounded ok, same deal, same price

Today a friend of mine offered me a ‘99 LM7, still in the 2500 2Wd truck. It has 298k on it. Problem with it, not getting fuel. Will start up with starter fluid but that’s all I know, sounded ok but really couldn’t hear it run. He only wants $400 for anything I want off it, will bring to my house for me to pick it clean.

**AussieinNC** · 11-28-2022, 05:55 PM

Hi there,

There is some great info and specs available at the following link

https://www.onallcylinders.com/2019/...gine-upgrades/

Enjoy the read

For L59 mods, here is the link

https://www.onallcylinders.com/2018/...ads-cam-specs/

Accelo · 11-30-2022, 11:14 PM

The larger flow injectors are great for motors that need the extra fuel. Like motors with Big cams and extra RPM.

11-27-2022, 02:59 PM	#1
mismith Registered User Join Date: Aug 2013 Location: Locust, NC Posts: 40	L59 (flex fuel) Motor good for swap? I’m about ready to finally do the LS swap on a couple different ‘66 C10’s. One of the recent donors I’ve found is a 2005 L59 (Z in 8th digit of VIN). The price is decent and it’s still in the Suburban and it runs excellent. I get everything I might need to go with it off this vehicle. I can’t find any real concrete answers online if this is a good version? I understand the rails, injectors, and even some connectors on harness are specific to the L59. Should I pass on this one and look for another LM7? I appreciate any opinions and advice. Thanks, Michael

11-28-2022, 12:03 PM	#2
verdell Registered User Join Date: Feb 2013 Location: Columbus, MS Posts: 435	Re: L59 (flex fuel) Motor good for swap? I'm not sure your intended use for the C10 you're swapping but there's nothing wrong with that L59 set up at all. I'd use it

11-28-2022, 12:18 PM	#3
mattfranklin Senior Member Join Date: Dec 2011 Location: Moraga, CA Posts: 800	Re: L59 (flex fuel) Motor good for swap? I don't have any insider information on this particular engine, but in general the flex-fuel vehicles have better materials in the fuel tanks, pumps, lines, and injectors to resist any negative effects of ethanol. Plus they have an ECM with more freedom to adjust the A/F and possibly (probably?) a sensor to detect how much ethanol is in the gas. If it were me I wouldn't worry about it. And I'd also create a YouTube on my steps and progress because a lot of those motors are out there. __________________ (Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340

11-28-2022, 04:49 PM	#4
mismith Registered User Join Date: Aug 2013 Location: Locust, NC Posts: 40	Re: L59 (flex fuel) Motor good for swap? Thanks, this particular motor has 269K miles. Saw some maintenance records in vehicle, looks like it was serviced regularly. Like I said it ran really smooth, no smoke. I know that’s a lot of miles though…$850 with harness, accessories, ecm, pedal and TAC module. He also has an ‘02 LM7 with 230k miles for same price, didn’t idle very well but acceleration sounded ok, same deal, same price Today a friend of mine offered me a ‘99 LM7, still in the 2500 2Wd truck. It has 298k on it. Problem with it, not getting fuel. Will start up with starter fluid but that’s all I know, sounded ok but really couldn’t hear it run. He only wants $400 for anything I want off it, will bring to my house for me to pick it clean.

11-28-2022, 05:55 PM	#5
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,155	Re: L59 (flex fuel) Motor good for swap? Hi there, There is some great info and specs available at the following link https://www.onallcylinders.com/2019/...gine-upgrades/ Enjoy the read For L59 mods, here is the link https://www.onallcylinders.com/2018/...ads-cam-specs/ __________________ Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox Last edited by AussieinNC; 11-28-2022 at 06:14 PM.

11-30-2022, 11:14 PM	#6
Accelo Registered User Join Date: Mar 2015 Location: washington Posts: 2,159	Re: L59 (flex fuel) Motor good for swap? The larger flow injectors are great for motors that need the extra fuel. Like motors with Big cams and extra RPM.



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