Question about a 5.3 LM7 in a crew cab dually? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lkefthrlkeson · 10-08-2010, 03:55 PM

I'm kinda new to the dually scene. I was wondering if a lm7 5.3 w/ a 4l60e would be enough power for 2wd crew cab dually. It's gonna be for cruising and hauling light loads. I'd plan on swapping in a bigger cam, headers, exhaust and intake. The reason I ask is because this what I have in my 2001 z71 and I love it. Has 220,000miles on it and still runs perfect. Thanks for the help guys.

Jonboy · 10-08-2010, 04:09 PM

I think a 6.0 might be a better choice, with a 4L80E. I was looking into swapping a 700R4 into my dually, and everyone I talked to advised me against it. I know the 80 zaps a little more power than a 60, so you might as well add the displacement while you are there.

lkefthrlkeson · 10-08-2010, 04:16 PM

Thanks for the reply. That would definitely be another option. Just noticed how cheap the lm7's are so I thought I would go that way. That being said, the 6.0 aren't really that expensive either. Know the 4L80's are more expensive than the 4L60's though. Has anyone on the board swapped a lq4 or lq9 into a crewcab dually?

Number21 · 10-08-2010, 07:52 PM

Think of it this way - a stock 5.3L has more power than anything that could ever came factory in your truck - even the 454.

KQQL IT · 10-08-2010, 08:08 PM

Quote:

Originally Posted by Number21

Think of it this way - a stock 5.3L has more power than anything that could ever came factory in your truck - even the 454.

Except torque.

Number21 · 10-08-2010, 08:34 PM

Quote:

Originally Posted by KQQL IT

Except torque.

Even the 454 was only rated at 360ft lbs. I don't know what the 5.3L is stock but I'm sure you can get to 360...

The 454 in my old '79 was such a pig. I think that year was only 205? horsepower. The 242 inline 6 in my Jeep can beat that.

STOCKISH · 10-08-2010, 09:24 PM

A 5.3 with no emissions and a tune will work great for cruisin and haulin light loads. They are awesome engines and you just cant beat them with a stick. I say go for it!

Matt Man · 10-08-2010, 10:00 PM

a carb 454 is rated at 230hp and 380 pound feet of torque and i think the tbi ones made 240hp.

Number21 · 10-08-2010, 10:06 PM

Quote:

Originally Posted by Matt Man

a carb 454 is rated at 230hp and 380 pound feet of torque and i think the tbi ones made 240hp.

Depends on the year, the EPA really killed the 454 in the late 70s.

KQQL IT · 10-08-2010, 10:23 PM

I drove a 86 1 ton with a 454that weighed 8500lbs empty 12k to 20k loaded. that 454 went 360k that sold me.. Hijack over

lkefthrlkeson · 10-08-2010, 10:47 PM

Hey guys, thanks for all the replies. I looked up the horsepower and torque rating for an 01 lm7. Said it was 285hp/325tq. So if I added full exhaust, cam, and air intake. I'd probably be looking at 330hp/375tq. With a good tune maybe more. I really want to go with this engine since the biggest thing I'll be hauling is a spray rig that weighs about 2500 pds. So what would be a good cam to go for this setup? definitely want to increase my torque as much as I can without affecting driveability. Want it to run like a stocker.

10-08-2010, 03:55 PM	#1
lkefthrlkeson Registered User Join Date: Oct 2010 Location: Tulsa, OK Posts: 25	Question about a 5.3 LM7 in a crew cab dually? I'm kinda new to the dually scene. I was wondering if a lm7 5.3 w/ a 4l60e would be enough power for 2wd crew cab dually. It's gonna be for cruising and hauling light loads. I'd plan on swapping in a bigger cam, headers, exhaust and intake. The reason I ask is because this what I have in my 2001 z71 and I love it. Has 220,000miles on it and still runs perfect. Thanks for the help guys.

10-08-2010, 04:09 PM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Question about a 5.3 LM7 in a crew cab dually? I think a 6.0 might be a better choice, with a 4L80E. I was looking into swapping a 700R4 into my dually, and everyone I talked to advised me against it. I know the 80 zaps a little more power than a 60, so you might as well add the displacement while you are there. __________________ 1974 Jimmy- 5.3/4L80e/NP241

10-08-2010, 04:16 PM	#3
lkefthrlkeson Registered User Join Date: Oct 2010 Location: Tulsa, OK Posts: 25	Re: Question about a 5.3 LM7 in a crew cab dually? Thanks for the reply. That would definitely be another option. Just noticed how cheap the lm7's are so I thought I would go that way. That being said, the 6.0 aren't really that expensive either. Know the 4L80's are more expensive than the 4L60's though. Has anyone on the board swapped a lq4 or lq9 into a crewcab dually?

10-08-2010, 07:52 PM	#4
Number21 Registered User Join Date: Aug 2009 Location: Oregon Posts: 611	Re: Question about a 5.3 LM7 in a crew cab dually? Think of it this way - a stock 5.3L has more power than anything that could ever came factory in your truck - even the 454.

10-08-2010, 09:24 PM	#7
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Question about a 5.3 LM7 in a crew cab dually? A 5.3 with no emissions and a tune will work great for cruisin and haulin light loads. They are awesome engines and you just cant beat them with a stick. I say go for it! __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

10-08-2010, 10:00 PM	#8
Matt Man Registered User Join Date: Oct 2009 Location: Buhl, Idaho Posts: 1,438	Re: Question about a 5.3 LM7 in a crew cab dually? a carb 454 is rated at 230hp and 380 pound feet of torque and i think the tbi ones made 240hp. __________________ 86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903

10-08-2010, 10:23 PM	#10
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,254	Re: Question about a 5.3 LM7 in a crew cab dually? I drove a 86 1 ton with a 454that weighed 8500lbs empty 12k to 20k loaded. that 454 went 360k that sold me.. Hijack over __________________ " That didnt make it any newer " " Dont antique the equipment "

10-08-2010, 10:47 PM	#11
lkefthrlkeson Registered User Join Date: Oct 2010 Location: Tulsa, OK Posts: 25	Re: Question about a 5.3 LM7 in a crew cab dually? Hey guys, thanks for all the replies. I looked up the horsepower and torque rating for an 01 lm7. Said it was 285hp/325tq. So if I added full exhaust, cam, and air intake. I'd probably be looking at 330hp/375tq. With a good tune maybe more. I really want to go with this engine since the biggest thing I'll be hauling is a spray rig that weighs about 2500 pds. So what would be a good cam to go for this setup? definitely want to increase my torque as much as I can without affecting driveability. Want it to run like a stocker.



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