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Old 07-20-2013, 12:17 PM   #1
BigRed76
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Questions about 5.3 upgrades

So I just got my 5.3 this week, it's a 2000 w/125K. But I have some questions about performance upgrades. The only thing I know for sure is that it will have headers and a cold air intake.
But if I were to throw in a bigger cam at what point do I need to get it tuned?
Or do you guys recommend getting a tune anyways?
If I do anything that increases air flow in/out of the engine then the MAF will see that and compensate accordingly correct?
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Old 07-20-2013, 05:55 PM   #2
BR3W CITY
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Re: Questions about 5.3 upgrades

To get it to run you'll have to get it tuned anyway; things like the VATS, o2's etc need to all get removed. Things like torque management and traction control also need to be fiddled with to get all your power to the ground in a swap car.

Since your already doing that, you might as well throw a small stick in it, providing you keep it conservative enough to run off stock injectors.

The tune itself is good for some HP, so its always worth it imo. Dyno tuning is the best from a power and driveability stance, and no mail order tune despite what anyone claims, will ever be as good.
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Old 07-21-2013, 09:19 PM   #3
bohmankid
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Re: Questions about 5.3 upgrades

Tune is usually always recommended after you start replacing internals with performance parts. I would even recommend a tune after bolt ons like headers.
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Old 07-21-2013, 11:28 PM   #4
BigRed76
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Re: Questions about 5.3 upgrades

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Originally Posted by BR3W CITY View Post
To get it to run you'll have to get it tuned anyway; things like the VATS, o2's etc need to all get removed. Things like torque management and traction control also need to be fiddled with to get all your power to the ground in a swap car.

Since your already doing that, you might as well throw a small stick in it, providing you keep it conservative enough to run off stock injectors.

The tune itself is good for some HP, so its always worth it imo. Dyno tuning is the best from a power and driveability stance, and no mail order tune despite what anyone claims, will ever be as good.
Yeah that makes sense. I don't need gobs of power, but figured a better cam would be very beneficial. Any recommendations on a cam that isn't too big for stock injectors?
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1970 Chevrolet Custom Camper K20
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1971 Chevrolet Custom C10
1972 Chevrolet Custom Deluxe C20, 5.3/4L60E
1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi
2004 GMC Sierra 2500HD, LB7/Allison, CCSB
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Old 07-22-2013, 12:45 AM   #5
tinydb84
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Re: Questions about 5.3 upgrades

Remember with a cam swap you may need new valve springs. Not a big deal but just something to consider
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Old 07-22-2013, 09:34 AM   #6
BossHogg69
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Re: Questions about 5.3 upgrades

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Yeah that makes sense. I don't need gobs of power, but figured a better cam would be very beneficial. Any recommendations on a cam that isn't too big for stock injectors?
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I'm using a Comp Cams LSr 265 cam, Lunati springs, 1.75" long tubes, K&N FIPK and a Blackbear Performance data log tune in my 5.3L with a Yank TT2600 converter. Stock injectors & intake. Good torquey DD setup. The valvetrain is a little noisier that stock, but the cam is over .600" lift with stout valvesprings, so that is to be expected.
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Old 07-22-2013, 12:14 PM   #7
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Re: Questions about 5.3 upgrades

Z06 cam is always a nice mild option. You can usually find a used one on LS1tech for cheap, or brand new they're on ebay or summit, etc for $300. you'll need the yellow beehive valve springs as well.

I'm running this cam with other upgrades and no dyno tune, yet, and it runs pretty strong.
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Old 07-22-2013, 02:18 PM   #8
tinydb84
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Re: Questions about 5.3 upgrades

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Originally Posted by JNJchev77 View Post
Z06 cam is always a nice mild option. You can usually find a used one on LS1tech for cheap, or brand new they're on ebay or summit, etc for $300. you'll need the yellow beehive valve springs as well.

I'm running this cam with other upgrades and no dyno tune, yet, and it runs pretty strong.
I picked up a used Z06 cam for my 5.3. I havent gotten around to putting it in yet (engine is on the stand)
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Old 07-23-2013, 12:07 AM   #9
BigRed76
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Re: Questions about 5.3 upgrades

Quote:
Originally Posted by JNJchev77 View Post
Z06 cam is always a nice mild option. You can usually find a used one on LS1tech for cheap, or brand new they're on ebay or summit, etc for $300. you'll need the yellow beehive valve springs as well.

I'm running this cam with other upgrades and no dyno tune, yet, and it runs pretty strong.
I've read that the Z06 cam requires longer pushrods because of a smaller base circle on the cam. Is that correct?
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1970 Chevrolet Custom Camper K20
1971 GMC Super K2500, 12V/NV4500 swap in progress
1971 Chevrolet Custom C10
1972 Chevrolet Custom Deluxe C20, 5.3/4L60E
1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi
2004 GMC Sierra 2500HD, LB7/Allison, CCSB
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Old 07-23-2013, 01:01 AM   #10
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Re: Questions about 5.3 upgrades

Many people run the same ones. Its .050 smaller so your pushrod needs to be .025 shorter. I am planning to mill my heads .025 to bump the compression anyway.
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