LY2 4.8, 08 and up Silverado ,799 heads. Best stock boost engine I know ov. Just cam/push rods/ trunnion kit/ stud it. And you got a winner bro ..........

 

Dont have to open rings?? What boost and fuel??

 

I would absolutely open rings. My buddy lost 2 motors with stock blocks expecting rings to have some blow by cause high mileage. Not always the case.

 

Agreed 100%. I pushed 15lb for years on mine at 600+ hp . If I was seeking more I would have gapped according. But that Ly2 4.8 is an excellent pull out for cheap , and it's damn reliable. ( Dollar for dallar)

 

Thanks guys, I did not know the 4.8, I inquired about both the L20 and the LY2, more or less they look the same, both blocks of cast iron, this is what we want.
Also I found this article:
https://www.motortrend.com/how-to/hr...g-bang-theory/
The article talks about 5.3 but reading it at the bottom of the page they said that no , it was actually a 4.8L
They pulled out 1203 horsepower on the bench from a 4.8 stock, it's an incredible thing, they did over 60 casts in a row without breaking anything in the engine block, they wanted to try to go further but they had run out of time on the test bench, I would have liked to know how far this block of evil iron could go

 

Whoever told you an ls wont hold up to 1000 rwhp is sadly misinformed. My stock bottom end ls3 makes over 1000 to the tires at 16 psi at 7300. It has all the power accessories and gets around 18mpg on e85 with 3.91 gears and a tr6060 in a 4000 pound car. Put a 6.0 or an ls3 with a pair of s366, supporting intake, fuel system and cam and you'll become a believer. Forge the bottom end and turn it up even more. Just my 2 cents.

 

Thank you so much, please can you tell me the mileage of this motor?

 

Pretty much sums it up.

 

ok since you are the second person accusing me of being a troll, please could you tell me what makes you think i am a troll? At least if you accuse me of something tell me why, I am accused of being a troll after two topics after subscribing to the forum, if it is because I asked stupid questions, you think that not everyone is an expert in mechanics, I have just bought more than one year my first chevy, I have never put my hand on an American v8 and I have never done very extreme elaborations, other engine types go to us in Europe, such as the N54 bmw or the k20 of the civic, but if you have problems with me speak freely, do not throw accusations without arguing, and if you don't want to do it on the forum then let's discuss it in pm or by mail, I have no problems, but I don't like being accused or wrongly offended, when I have done nothing damn wrong, if not try to learn more about a topic, forums are for this, learn and socialize.

if you don't believe that they told me that a ls engine with stock lock cannot handle 1000 horsepower then I am sending you in pm the link of the forum on which I had this discussion, I do not want to post it openly on the forum just not to speak ill of other forums, after all, everyone is free to write what they like, without being judged for this.

 

​​​​​74,000 miles and runs the same as always. It actually runs like a normal car even with a big cam, but that has a lot to do with the capabilities of the proefi system and my tuner. Ls engines are the best in my opinion. They are simple, have great heads and are tough as hell in stock form.

 

Wow bro this is very important to me, i own an LS2 and based on what other people was told i was already looking for a 5.3 or 4.8 to swap, i thought i wasted my money but you did well 74,000 miles with over 1,000 horsepower per wheel, this takes away any doubt from me. Please can I ask you in detail what have you mounted? Can the parts you have mounted on LS3 also be mounted on LS2 or are they different? Thanks again, you don't know what a gift you gave me with this post, thanks bro

 

Its the engine that came in the car. It has a custom ground solid roller, matching springs, stock heads, no port work, btr shaft mounted stock rockers with xda pushrods. I gapped the stock rings 24 thousandths, arp rod bolts and head studs and a melling pump. It has a fast lsxhr high ram intake, huron speed turbo kit with twin 6766, bosch 210s, fore innovations fuel system set in parrallel and proefi for management. E 85 exclusively. There is a tuning/ build strategy when using a stock bottom end to keep it alive and making good power. The fairly large (for a daily driver) turbos keep boost targeted towards upper range power as well as the intake and cam. Torque is what hurts rods and sbe parts. Cylinder pressure is highest at torque peak and boost is kept a little lower at torque peak and added back above that. Another benefit to having a higher rpm setup is traction management. If this is a street car, traction is limited by tire and chassis. Small turbos, long runner intakes and small cams make for a ton of torque down low, but tends to fry the tires so. Shifting the curve higher with larger turbos, cams, etc allows you to get the car moving, limits excessive low speed torque, reduces low speed bmep, generally produces lower iats and helps you stick the car in street trim. Its not laggy, it just comes in where it was designed opertate. Trust me, its only a downshift away from pulling like a mule. Another thing i like about the setup is that its not always trying to make boost during normal driving and adding fuel thereby reducing fuel consumption. Anyways, im sure that some people will have a different approach, but it works for me. A good plan and A GOOD TUNE is the key. Find a good tuner and relax a little.

 

Most of the questions you have asked could be answered simply by using the search function of this forum. Many could be answered with a Google search. Once you posted about LS engines not being reliable above 800hp, it started to look like you were just tossing out bait, hoping to reel in an argument. That is why I decided to think you are trolling. If I am wrong, I sincerely apologize. Otherwise, **** you.

 

ok I understand your point, I explain why I made this topic, I searched on motortrend, youtube and other forums, opinions about it, but I got very conflicting opinions. I preferred to open this topic because this forum has a lot of users, so I could have benefited not only from many opinions, but also from the opinions of people who have followed different paths to overcome the 1000 horsepower threshold. Many things to those who live in the USA seem easy and common, but in Europe the LS motors do not use them, and they cost a lot, so I have to inform myself well before making a purchase.
To give an example, most of the pickups from us are diesel, finding a chevy with 5.3 petrol is a rarity, the last one I found asked me for 5000 euros, almost 6000 dollars, for an engine that was mounted in a pickup from a junkyard.
So if I consider the engine between 4-5000 euros, forged pistons and connecting rods 2-3000 euros, 76mm turbochargers etc ... I exceed 15000 euros, unfortunately I don't earn much, I have to pay attention to how I spend the money. That's all

 

 

i have a 2005 ls2 under my car, and the ls engines are american v8s i love, i'm not here to make trouble but just to find out more before i start modifying my engine, no bullshit making me break my engine and wasting my money

 

Hello guys. I have a GM 4.8L Liter V8 Vortec L20 Engine. Im stuck in position where my engine builder tells me my heads dont work for my engine. I called texasspeed and bought PCR220AC 15-degree CNC cylinder heads, 64cc. when I emailed them that those heads wont work I got this back.
"These heads are for the 4.8/5.3 motor. I do not have any heads that are smaller than the 220as cast heads. The 4.8 and the 5.3 are the same bore size. The requirement of the stock valve angle is a 15degree angle . These 220 heads are a 15 degree valve angle also. These heads are the only ones that will bolt on the smaller 4.8/5.3 motors. These are the correct heads"

And my engine builder said this it is not about the valve angle but about the combustion chamber is too big for the small bore.

What should I do now?

 

They'll work. We've used them on a couple of 5.3s. Find another builder.

 

Worst case mill the new heads to gain compression lost by going from a 61cc to 64cc chamber. Engine builder should have recommended this.