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6.0 or 5.3 crate motor

govener71

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govener71 Enthusiast

govener71

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Truck is in the shop for a weird knocking noise. Thought it was a flex plate, tech said no cracks and everything looks good on it. Now he is thinking internals. Said it might be a bearing on a cam or crank and by the time they do that it might cheaper for the insurance company to just put in a new motor. I sort of jokingly said time for the 6.0. He replied with a if you want to cover the difference it can be done for not to much more, if that is what needs to be done.

 

Thoughts?

 

Currently it is a 2006 silverado 5.3 vin z with 3.43 gearing, z71 4x4 crew cab, with 94,000 miles on it.

Badass69 Senior Enthusiast

Badass69

Posted
Posted

How did he inspect the flex plate? Even unbolting the convertor doesn't allow diddley for room to adequately see. Now if he started it and it and it still did it unbolted... okay. And if its not a bad cat lol. I trust a dealer Tech's diagnosis as far as I could throw the guy. 6 liter will drop in and run okay even on the 5.3 tune whether its an lq4 or lq9. But get it tuned properly lol. Dealer will want more than your truck is worth probably for the engine and install though

 

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govener71 Enthusiast

govener71

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He took out the starter and inspection plate used a camera and found nothing. Checked the bolts and everything was tight. Shavings now found in oil. This is not a dealer tech, well he was then opened his own shop. I have an extended warranty on the drive train. Hope that works too.

Badass69 Senior Enthusiast

Badass69

Posted
Posted

Well shavings seals the deal. Do the 6 litre... its not worth doing another 5.3. You won't regret the swap. Everything off your 5.3 down to injectors switches over to a 6 liter of any kind. If you can get a new lq9 reasonably do that. The 10:1 compression just makes it that much better. But the lq4 is an excellent engine too and really you won't be able to tell the difference between them tuned.

 

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Badass69 Senior Enthusiast

Badass69

Posted
Posted

Another option is the GMPP HO 5.3l crate motor.

A stock lq4 or lq9 will skull drag that thing any day of the week. I mean in just drivability, racing, towing what ever. Don't even waste your time and money.

 

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Chris Senior Enthusiast

Chris

Posted
Posted
Another option is the GMPP HO 5.3l crate motor.

 

A stock lq4 or lq9 will skull drag that thing any day of the week. I mean in just drivability, racing, towing what ever. Don't even waste your time and money.

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Listen to this man. I know. I did the swap for an LQ9. It cost me $3020 cash out the door for a LQ9 with 35k and a new vette 2nd servo installed

 

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govener71 Enthusiast

govener71

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I appreciate all the input and will look into the lq9 first then the others. Will there be any draw backs like longevity or mileage, that is going to be large enough to cause concerns. I only get 15 on the highway so if nothing else it can't be that much worse.

Badass69 Senior Enthusiast

Badass69

Posted
Posted

A stock Ls is a stock Ls. Displacement makes zero difference to longevity. Your transmission... well depends how you drive really.

 

Your mileage will not change if that's all you currently were getting anyway.

 

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Chris Senior Enthusiast

Chris

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I pull 17 on the highway with an LQ9 and 3.42 gears

 

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govener71 Enthusiast

govener71

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I can't hit 17 now, best I've seen is 16.3. Would anything need, or should, be done to my 4l60e?

Chris Senior Enthusiast

Chris

Posted
Posted

Shift kit and vette servo. I just have the servo. Been almost a year of hard driving. I cant get the 60e to grenade

 

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Badass69 Senior Enthusiast

Badass69

Posted
Posted

Transgo HD2 and a vette servo. Drive it until it grenades. Really a 6 cylinder trailblazers torque convertor is a nice addition too. Gives about a 2600 rpm flashing speed but drives nice and tight otherwise. Exactly what we did to a buddies junker 03 he bought when we dropped in his lq9. Engine went in stock down to clutch fan, air intake and 5.3s old exhaust. Tune and trans work only with 410s was a fun truck.

 

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