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Old 11-04-2013, 10:37 AM
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Should I, can I stroke out a vortec 5.3

I have a 2002 Chevy Silverado Z71 with the vortec 5.3 gen III block with aluminum heads. The truck was previously owned by an 80 something years old man who drove the truck 3 days a month for 7 years. I have done a few things to upgrade the parts that have gone bad without going into the engine. Cold air, headers, flowmaster cat back, electric fans, Richmond gears, and Eaton posi in the rear. I have a very bad lifter tap and the engine is sluggish so I figured either I buy a crate or rebuild this engine. If I rebuild I want to get the most performance out of it as possible and I have considered stroking it out. What do yall think?

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Old 11-04-2013, 11:55 AM
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Quote:
Originally Posted by BamaZ71 View Post
I have a 2002 Chevy Silverado Z71 with the vortec 5.3 gen III block with aluminum heads. The truck was previously owned by an 80 something years old man who drove the truck 3 days a month for 7 years. I have done a few things to upgrade the parts that have gone bad without going into the engine. Cold air, headers, flowmaster cat back, electric fans, Richmond gears, and Eaton posi in the rear. I have a very bad lifter tap and the engine is sluggish so I figured either I buy a crate or rebuild this engine. If I rebuild I want to get the most performance out of it as possible and I have considered stroking it out. What do yall think?
Every time I see someone wanting to make their truck fast, I get a sour feeling in my stomach over it. You're beginning with the worst possible candidate, a very heavy truck. If you want fast, purchase an MGB roadster and swap in a Ford 460 with a C6 and 9" rear. Cheap to build and guaranteed to blow your skirt up. Alternately, swap a 454/502 into your truck and at least begin with some cubic inches to help haul all that weight around.
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Old 11-04-2013, 12:25 PM
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Thank you for your reply. Fast is not really what I'm looking for I'm more looking for torque more for towing than anything. I have towed one trailer with almost 2000lbs on it and the truck struggled. I can go pretty good as it is but I want to have the ability to put a trailer on the hitch and not feel the strain.
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Old 11-04-2013, 12:35 PM
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Originally Posted by BamaZ71 View Post
Thank you for your reply. Fast is not really what I'm looking for I'm more looking for torque more for towing than anything. I have towed one trailer with almost 2000lbs on it and the truck struggled. I can go pretty good as it is but I want to have the ability to put a trailer on the hitch and not feel the strain.
Same answer, 454/502.
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Old 11-04-2013, 02:07 PM
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The 5.3L should not struggle with 2k lbs. It should not labor much with 5k lbs.. Either something is wrong with the truck or you are just expecting too much. The 5.3L does lack torque down low, but if you keep the RPM above 3k, it will do what little you need..
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Old 11-04-2013, 02:31 PM
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Originally Posted by techinspector1 View Post
Every time I see someone wanting to make their truck fast, I get a sour feeling in my stomach over it. You're beginning with the worst possible candidate, a very heavy truck. If you want fast, purchase an MGB roadster and swap in a Ford 460 with a C6 and 9" rear. Cheap to build and guaranteed to blow your skirt up. Alternately, swap a 454/502 into your truck and at least begin with some cubic inches to help haul all that weight around.
except chevy 2wd trucks with the 5.3 or 6.0l are the new favorite cheap way to go fast...

It'll never be as nimble as a MG but they can make big power cheaply and hold it pretty damn well with stock parts.
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Old 11-04-2013, 04:31 PM
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I don't think my S10 with a 5.3 in it is slow! But then it's kind of like a 1/2 a truck in weight.
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Old 11-04-2013, 09:00 PM
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2011 Stroker Engine Guide: Unlocking LS Stroker Engine Potential: Engine Builder
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Old 11-05-2013, 06:58 AM
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Quote:
Originally Posted by BamaZ71 View Post
I have a 2002 Chevy Silverado Z71 with the vortec 5.3 gen III block with aluminum heads. The truck was previously owned by an 80 something years old man who drove the truck 3 days a month for 7 years. I have done a few things to upgrade the parts that have gone bad without going into the engine. Cold air, headers, flowmaster cat back, electric fans, Richmond gears, and Eaton posi in the rear. I have a very bad lifter tap and the engine is sluggish so I figured either I buy a crate or rebuild this engine. If I rebuild I want to get the most performance out of it as possible and I have considered stroking it out. What do yall think?
I think it is MUCH less expensive to swap the 5.3 for a 6.2. Also, be sure to understand the emissions testing requirements where you live.
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Old 11-05-2013, 07:08 AM
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you can buy a 454 cube LS,dont use the monster heads they come with though.
depends on your budget,,, there is also an iron block 427 LS available,again,dont use the monster heads,use something close to the LS-3 heads
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Old 11-05-2013, 11:31 AM
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Quote:
Originally Posted by rizbiakt09 View Post
We have towed a single truck along with virtually 2000lbs into it along with the pick up truck fought. I am able to get excellent mainly because it can be although I want to can set any truck about the hinderance and not have the anxiety.
Excuse me? How's that again?
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Old 11-06-2013, 10:33 AM
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Thank yall for all the great input its been a great help in my project. A few posts about swapping for a bigger motor instead of stroking mine. How much modification will be needed to the truck to make a swap to a bigger motor?
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Old 11-06-2013, 10:59 AM
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If you go to a 6.0L, it's R&R + have the ECU flashed
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Old 11-06-2013, 11:09 AM
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Quote:
Originally Posted by BamaZ71 View Post
I have a 2002 Chevy Silverado Z71 with the vortec 5.3 gen III block with aluminum heads. The truck was previously owned by an 80 something years old man who drove the truck 3 days a month for 7 years. I have done a few things to upgrade the parts that have gone bad without going into the engine. Cold air, headers, flowmaster cat back, electric fans, Richmond gears, and Eaton posi in the rear. I have a very bad lifter tap and the engine is sluggish so I figured either I buy a crate or rebuild this engine. If I rebuild I want to get the most performance out of it as possible and I have considered stroking it out. What do yall think?
Before you get all hung up on spending piles of money, check your headers at the head for an exhaust leak. They sound exactly like lifter noise, and the computer see's the noise as knock and pulls out timing, no check engine light, no other symptoms, just loud and sluggish....I have done a pile of exhaust studs on 5.3's..... The ls motors are real real tough and I would be surprised if its actually hurt with low mileage and someone driving it gentle....ie: an 80 something year old lol.
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Old 11-06-2013, 11:16 AM
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Originally Posted by BamaZ71 View Post
Thank yall for all the great input its been a great help in my project. A few posts about swapping for a bigger motor instead of stroking mine. How much modification will be needed to the truck to make a swap to a bigger motor?
And if you discover your motor is actually healthy, look at a small single turbo as opposed to a bigger motor.....ls motors love boost, and you can have your cake and eat it too...acceptable fuel mileage and more then enough power to tow whatever you need.
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