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Discussion Starter · #1 ·
I am not a genius at motors nor am I an idiot, but what I am not familar with performance in motors. I am not sure of what you can produce or what capabilties each block can handle. I have been told the 5.3, 4.8 and the 6.0 are all the same blocks. is this true. also what are these engines considered. . for instance the older 5.7 are considered small black, then you have lt and ls's does my motor have a pretty name?

What would intake, 3.5" exhaust, shorty stainless steel headers, and an e-fan produce in gain?

Am I able to just change out my cams with out modifying anything else? and would this be realiable for everyday driving(CAMS)? what size cam would I need for moderate change. I want to hear my tahoe lope! any help will be appreciated.
 

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HOT AIR BALLOON OWNER
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Jeff -

5.3 and 4.8 block is the same, 3.78" bore. 5.7 has a 3.9" bore. 6.0 has a 4" bore. Stroke is less on the 4.8, can't recall what... like 3.2x". 5.3/5.7/6.0 have the same 3.62" I recall. Mains are all the same at 2.75" too I believe.

ANYWAY -

Intakes are good for 7-10rwhp usually
Shorty headers - 4-6rwhp (stock manifolds are basically headers)
3.5" exhaust will only hurt TQ, stick with stock 2.75" and a weld in muff
E-fans are about 6-8rwhp over an unlocked clutch



Best place to start is with an intake, e-fans (with larger alt), pulleys, and a tune. There's a solid 40rwhp on stock exhaust.

Figure full length (long tubes) with a good muffler will add around 20-25rwhp and similar torque too. Look for a header with a 1-5/8" primary tube and 2.5" collector for the 4.8... this will maximize your torque.

Cam wise, go with something mild for street use. You want max torque for a truck/SUV... not HP to 7000rpm. Something around 208-214° intake duration, 212-220° exhaust duration. Lift from .530-.550 (allows use for LS6 springs, $65 only). LSA from 112-115LSA. 112 will chop/lope a bit more and make the torque better at lower RPM. A cam within those specs will add an easy 40rwhp at least.

In the mix somewhere, you'll want to beef up the transmission. Build the valve body and add a fat trans cooler too.
 

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EMBRACE WHAT'S LEFT
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eric you should make a stick of all the best engine mods so people will know where to get the best bang for there buck
 

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Verbal Assault Specialist
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This is info I like. I have a 4.8 and I wish I had the cash to drop in a 6.0 but I am about to buy a house. So I figured performance upgrades that would work with a 6.0 that way I'm not wasting my $$.
 

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Discussion Starter · #6 ·
Jeff -

5.3 and 4.8 block is the same, 3.78" bore. 5.7 has a 3.9" bore. 6.0 has a 4" bore. Stroke is less on the 4.8, can't recall what... like 3.2x". 5.3/5.7/6.0 have the same 3.62" I recall. Mains are all the same at 2.75" too I believe.

ANYWAY -

Intakes are good for 7-10rwhp usually
Shorty headers - 4-6rwhp (stock manifolds are basically headers)
3.5" exhaust will only hurt TQ, stick with stock 2.75" and a weld in muff
E-fans are about 6-8rwhp over an unlocked clutch



Best place to start is with an intake, e-fans (with larger alt), pulleys, and a tune. There's a solid 40rwhp on stock exhaust.

Figure full length (long tubes) with a good muffler will add around 20-25rwhp and similar torque too. Look for a header with a 1-5/8" primary tube and 2.5" collector for the 4.8... this will maximize your torque.

Cam wise, go with something mild for street use. You want max torque for a truck/SUV... not HP to 7000rpm. Something around 208-214° intake duration, 212-220° exhaust duration. Lift from .530-.550 (allows use for LS6 springs, $65 only). LSA from 112-115LSA. 112 will chop/lope a bit more and make the torque better at lower RPM. A cam within those specs will add an easy 40rwhp at least.

In the mix somewhere, you'll want to beef up the transmission. Build the valve body and add a fat trans cooler too.

I do have a 200amp alt but what does that make a diff in tq and hp? so the only thing to run a cam is to change my valve springs? to the ls6. Also like I had stated I am new to tuning and hp stuff what would be a good route for pully's?
 

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Discussion Starter · #7 ·
Does getting a multi spark or hotter spark ign. help out as well. I am not going to do much just help gain so when I am pulling the trailer. I do not want to lose my gas mileage. I get approx. 20-24 mpg. also I forgot to mention I am sure something has been taped or reprogrammed on my ecu because this truck used to be used by the police dept. as a k9 unit.
 

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GMade03
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272 Posts
bro i have a 4.8 also i dunno much about having cams but i do know they sound sick... other then that there gonna kill your gas mileage.. and with a 3.5 exhaust your gonna lose power dont go more then 2.5.. shorty headers i hear arent worth the money if you want headers save up and get Long Tubes and ceramic coated is worth the extra money
 

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HOT AIR BALLOON OWNER
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I do have a 200amp alt but what does that make a diff in tq and hp? so the only thing to run a cam is to change my valve springs? to the ls6. Also like I had stated I am new to tuning and hp stuff what would be a good route for pully's?


No, the alt won't effect you in any measurable fashion

I'd also run hardened pushrods to be safe. A cam will not make your economy go down the shitter if you pick a GOOD street cam for a truck.

I haven't a clue on the tuning end, no copy of any program aside from LS1edit... and no one uses that anymore.

I think ASP is the only brand for truck pulley setups.
 
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