cobalt964

hello, I have already built this. this is not a I wanna do this and then do this and then do this thread. it is already done. first read the carcraft.com ls 5.3 cam dyno article. they took a bone stock lm7 5.3 and dynoed it with various cams and printed the results. according to the article the stock 5.3 with dish pistons, and only 9.4:1 compression with a ls2 cam made 403hp.

first off this is not the only way to make 400+ reliable hp on pump gas in a 5.3. you could use different heads, different cams, power adders, etc. but this worked for me.

my build; low mile 2005 l33 5.3 aluminum longblock. stock these have the flat top pistons and 243 heads, 9.9:1 compression, already a good start. then I stuck in a ls2 cam and springs. a ls6 intake with ported throttle body and the flex fuel injectors 35lbs. installed a pair of stainless steel headers, and a nice tune. this is in a 2280lb car with a 5 speed. it is a rocket, superbike on four wheels kinda rocket... on pump gas and didn't break the bank building it.

I have about $1750.00 in the motor. and I can very very conservatively say it makes 400+hp at the crank. more likely around 425-430chp. if the stock 5.3 make 403chp with the ls2 cam then the l33 with mods will definitely do that and then some.

again, by no means is this the only way to get 425hp from a 5.3 but it is a cheap and viable way and not break the bank. but this recipe could help others... have fun and happy motoring.

cobalt964

parts list dollar breakdown; l33/243 longblock with 8k miles was 600.00. 12k mile oem ls2 cam and springs 150.00, ls6 intake 300.00, ebay .080 pushrods 85.00, arp rod bolts 90.00, ebay 8740 headstuds 68.00, oem gm new bearings, gaskets, seals, and timing set 190.00, lq9/flex fuel injectors 50.00, 78mm ported oem throttle body 65.00, truck 85mm maf 35.00, ebay stainless headers 195.00, made my own stand alone harness 0.00

dr_whigham

iTrader: (49)

Nothing to add really, other than ENJOY IT!!

But... You and I both know, you absolutely STOLE that motor!

DREAMZ28

iTrader: (1)

Wow only 600 for a basically brand new motor. I'm guessing the car was totaled and everything was priced to go. Good job man, what's it going in?

redtan

iTrader: (5)

A 6.0 with much higher compression and same cam makes right at 400bhp. I don't buy a smaller 5.3 with a full 1.5 points less in compression would make the same.

redtan

iTrader: (5)

A 6.0 with much higher compression and same cam makes right at 400bhp. I don't buy a smaller 5.3 with a full 1.5 points less in compression would make the same.

cobalt964

yes the motor came out of a rolled over Silverado.

redtan, the 5.3's make good power, check out the truck forums too for similar information I have posted.

the motor went into a 1976 Porsche 911 Carrera 3.0 European coupe. fast fun car.

cobalt964

a 2002 lq4 6.0 makes 300hp stock, the l33 5.3 makes 310-330hp stock depending on the source you read. then add mods on top of that. but in all like I said, there are many ways to do this.

I have 9 5.3's, 3 6.0's, 2 6.2's, and a 7.0 all from the ls family motors. there are lots of combos that work for different people for different project cars. that's the point I was making. simple, cheap, reliable, and fun.

A.R. Shale Targa

iTrader: (2)

The OP referenced a magazine build which did the multi-cam test on an
engine dyno. He's not claiming rearwheel. Hell even if he's only around 350
to the ground in a 2300 lb car....I'd bet it's pretty much a wild rocket on he
street.

cobalt964

yes I got a very good deal on it.

RonSSNova

iTrader: (3)

Sweet. I'd like to see the car.
Why bearings on such a low mile engine?
Ron

cobalt964

only pic i have of the car. sold it to a friend a few yrs back. recently trying to buy it back tho.

I always put new timing set, bearings, gaskets and seals in any used engine. cheap insurance.

RonSSNova

iTrader: (3)

I bet that surprised a few people and pissed off the Porsche guys!
Ron

cobalt964

it totally pisses off the Porsche guys lol. it eats vettes and vipers like candy lol.

cobalt964

I currently have 2 lsv8 911's im building. both builds are here on ls1tech in the conversions and hybrids forums.

cobalt964

for those who say just build a 6.0 or ls3 or whatever else, not everyone needs cubes or wants to spend that kind of money is my point. it depends first on their goals and second on their budget. yes I have built a lq4 with patriot heads and cam and it makes a conservative 500hp, I have built a ly6 with ls3 intake/heads .600lift also makes conservative 500hp, also have a ls3 with hotcam that makes a conservative 500hp... point being there are several different ways depending on how you go about it. but also keep in mind on those motors I spent a lot more coin as well. so the l33 is a good little motor with some nice factory pieces and if you do it right is a nice budget build for some decent na hp. just my .02

cobalt964

checking my signature

yonerhottlt1

iTrader: (21)

Nice...that Porsche must fly!!

cobalt964

yes it does lol. thank you for the compliment

cosbysweater

There is a l33 at the local wrecking yard in a wrecked silvarado, I grabbed the heads, this makes me wanna get the block as well