How many miles on the motor currently?

I've had several modded LS based trucks. All depends on your wallet and how far you want to go. Bolt-ons, turbo/SC, nitrous, cam/stall, etc. There are websites solely dedicated to this subject such as hptrucks.

Right now I have a '67 C-10 that has an L92 6.2/6L80 combo swap. Lstech headers, custom intake, custom tune, thunder racing cam, circle d stall, eaton lsd with 3.73 gears.

Good starting place would be intake, long tube headers, full exhaust, and a custom tune by a reputable tuner (not a handheld tuner).

It is out of warranty, so that is not a problem. I have right at 148k on the engine.

If you get headers, get long tube headers. The short ones are pointless.

Throttle body spacers don't do anything.

Cold air does very little.

Exhaust, hard to beat corsa or borla. I had borla XR1 mufflers on my last truck and they sounded great.

Cams, Texas Speed does good work and has everything you need to do the swap. I can't point you in the right direction as to which one because my truck had a blower on it. Call texas speed and tell them what you want to do.

If you want good reliable horsepower get a magnuson superchager. I had mine for 11 years without a hiccup.

If you plan to go extreme, start with a turbo kit instead of a supercharger.

Put ARP rod bolts in it. The bottom ends are strong on those motors but the bolts are a weak link. This can be done without pulling the motor.

If I had it to do over again I'd do cam, headers and a 150-200 shot of nitrous.

Your transmission is going to break so plan on that. The 60e can't stand horsepower in a truck. Best advice here is to put an 80e in it from the start, don't waste money on a built 60e or 65e.

If the truck is '07+ ditch the AFM the correct way with the kit from Texas speed.

I have FlowMaster mufflers dumped behing the cab right now. Just looking for something new. I dont want to spend $3k on it. I mainly want a different sound than the Flow's, more hp, and just really want things that I dont have, such as a cold air intake, long tube headers, etc. What kind of intake would you recommend for a 2007 Chevy Silverado with a 5.3?

Thanks for the advice. I dont really want or see a need for nitrous or a supercharger on my 2007 Silverado that is lifted, but I have been wrong before. And the part about the transmission is bothering me a little. I surely dont want to blow that darn thing and spend a couple thousand on a new one.

Man, sounds like there is a lot of stuff that I could do. A whole lot more than I expected or thought of. Maybe I could save some money on the throttle body spacer and cold air intake and spend that somewhere else.

I think I'd buy a 6.0 Liter and have it gone through and built with what you want, then drop it in with the headers and sell the 5.3.

Might just do that when this motor is on its last leg. Just dont want another payment right now and dont have the cash saved up. I would get the 6.2 liter if I did anything though.

Worked a ton on a 5.7L, figure same results out of a 5.3L.
Cold air intake - pain in the butt to clean filter all the time, no hp gain, not worth it at all
Exhaust - purely for sound, no noticeable hp gains, only reason I replaced was due to bad cats and what I thought was clogged muffler.
SC or Turbo: never dealt with supercharger or turbo but Ive read the 5.3L is a great candidate, supposedly some cheap turbos that have great reliability and huge gains.
Tune: went with black bear tune and it drives so much better as far as throttle response and acceleration - worth the money to me, no noticeable hp increase
Transmission shift kit - snappier response, only did this because I had to rebuild
E-fans: not sure if all 5.3's had efans, but highly recommend if you still have clutch fan. Less noisy and cooler A/C at idle
Gears: went with 4.56 to turn 35's, I like the acceleration and the better rpms at highway speeds for towing, would have went with 4.10s if I wasn't towing


Once you start modifying some items, it will require others to change as well.
Do you want speed, sound, or towing power?

I have Black Widow 250's on my C10 but I've had Magnaflo and Borla. All quality made with quality sound. Flowmaster works but lots of drone. Intakes aren't a big factor unless you are making lots of horsepower. I'd put that money towards a good tune.

As stated above, you can always do a swap with a 6.0 or 6.2 with matching trans. I personally wouldn't want to beat to hard on a motor with that many miles. Just my .2

Stacks

what year 5.3 as a gen IV engine will make 900 to the tires on a turbo with nothing done to the engine other than delete , and a cam swap . They are very tough . Earlier years not as strong . For pure power and toughness the 4.8 will go even harder .. But for a truck a cam swap with a cam made to produce tq would be the most fun , ( bullet cams would be my choice ) Tuner wise I would HP and have Andy M tune it I can pass that info along at a later date .

CAI and decent headers and a cam swap makes for a nice all around rig .

Tons of turbo kits out there for it as well .. The turbo kits can be very fun just do nto go crazy on boost .

In the process of building another 5.3 turbo for my 62 and selling off the dart NOS engine in it ..

Filling the bottle is costly and and PIA as well even with 4 bottles

New engines these days are pretty much tapped as far as getting the most power you can out of them with minor mods like exhaust and intake (Gas engines). You are going to have to go to new cams, re-tuning, bigger injectors, etc...in order to gain any meaningful power. That's where you will start to gain power, but then realize your current engine internals are only rated to a certain HP, which will require those parts to be swapped for something better. On top of all that, you still have to pass emissions.

Most guys don't realize it but when they bolt on a high flow cat back exhaust, they are dropping their torque for a slight HP gain. And by slight, I mean less than 5 hp. For city guys who have never pulled a trailer, much less know how to hook one up, that doesn't matter.

Truck Engine Mods



Then I would say the quickest, cheapest way to get noticeable horsepower gains would be a supercharger and exhaust.

I would start with Summit racing, I bet they have a kit/package.

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