How GM Created the 7.0L LS7 Engine 🤯
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- เผยแพร่เมื่อ 27 ก.ย. 2024
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I told her my 4 inch stroke was massive😢
they different categories to measure
Beat me to it 😂😂😂
My LS7 is going on it's 18th year with untouched stock heads, went ripping in it yesterday, but ya go off 😎
Imagine being the one man who made every LS7 by hand.
Too bad the valve drop is real in those LS7’s
What is valve drop in nooby terma
@@kev.s5104 the valves come in contact with the pistons and usually get bent or blow a hole through a piston
@@heathkill4821 That's not what happens. The valve guides are the actual issue. There's fraction causing the exhaust valve to wear excessively. As a result they will break and fall into the burning chamber causing the engine to go boom.
@@3O2MuStAnGvalve drop is valve drop no matter how it drops it drops😋 i know the guides go out and it eats the pieces, it also eats the valve hence the name valve drop.
@@heathkill4821 Hopefully a head swap gets the issue solved because I'm planning to get me a Z06 either this or next year if things go as planned. The valve nightmare aint stopping me. 🫣
There are several people that built the LS7s and each has their names individually stamped on an engine plate.
The value issue was due to incorrect machining of the value guides not the valves themselves
Everything I've seen is its a valve issue and the titanium is strong and very light but not wear resistant..
@TripleAstyle1 It becomes a valve problem after its worn unevenly due to the bad guide. Not to mention the exhaust valve stems are hollow core. I replaced mine with all stainless steel
Don’t forget the dropping of valves
I was wondering if this was the same motor that had the valve issue.
I thought it was the valve guides that were defective, not the valves themselves.
Everyone talking about dropping valves in the comment section, can you tell me about it
@@abdullahmansoor1199 I guess there was a design “flaw/overlook” that milled the valve guides to rock and fail. That’s off memory so do fact check me
And they only cost 15k to rebuild. Ask me how I know…
Because you tried to do it all by yourself not knowing wtf you're doing
I love big ol American v8s, that being said the builders must have been pretty lazy, or someone fucked up at qc because the only reason these engines throw valves sometimes is because the clearance on rhe valve stems were all fucked up
The entire cylinder head casting is complete junk.
Cracked/broken off pedestal mounts, dropped seats, dropped valves. Just a bad design
Research is showing the titanium valves are hard to get in tolerance and wear fast thus going out of tolerance.... essentially junk.
Great engine ! Except for the whole valve drop thing 😂 I’m scared to drive mine 🤦🏻♂️
Such a cool animation
They were actually hand built in Bowling Green Kentucky, engine plant right next to Corvette production facility.
With the "wiggle" system in place we essentially ensure short term performance at the price of reliability
Greatest engine of all time. It’s great at all RPMs and incredibly cost effective and fuel efficient for its massive displacement. Just don’t forget to “fix” the heads
I’d love to put a 7L in every Chevy I own except for my 90’ barn door burb. He’s getting a 8.1L and a 5 speed manual plus a NP205 with a magnum box. Can you say torque for days!!!
Lmao its like no one has ever heard of the 427s from the 60s same more and stroke but much cooler
Now, if GM had stood behind the intake valve issue as they should have..... Swallows the valve and thirteen thousand dollars down the drain.
They did. Replaced mine at 5k
You just have to figure on immediately fixing the heads on an LS7. I bought an LS3 and may sc it .
Has anyone heard what the root cause of failure is? Is it a sodium filled valve naking the metal thin? The valve keepers digging into the valve causing failure? Spring tension causing valve instability or too hard of closing? The use of titanium that (supposedly) does not like brake parts cleaner? Or a mix of these and other possibilities?
@@kevinkalivoda3442bad valve guides tolerance on a "few" sets. The majority of issues are bad "fixes" and poor engine work. Get head work from a reputable shop. It's a great engine
it took forever for them to come up with a decent head and a larger stroke then bore.
I’m not convinced that Titanium was the best idea.
Valve and rods can both be issues. Titanium is abrasive.
Is this the same motor that had a issue with dropped valves grenading the motor?
Yup
I've always found the valve covers to be hideous, but I guess it does not matter simce they serve their purpose
And they drop valves at less than 300 miles 💥 uh huh 😂 GREAT job GM
All you have to do is get the valves and valve guides replaced and it's not an issue anymore.
@@BeepBeepParkie At 300 miles? That is ridiculously insane amount of work. Just replace the heads and be done in 1/2 the time.
@@BeepBeepParkie Wrong
@@jasonpocaro2730OP is being dramatic. They'll go 10s if thousands of miles before it happens usually
@@cc23001 Guy picked up brand new vehicle, got ride home with truck. One way back to dealership, engine exploded. Fact. Not a joke... Less than 300 miles on the 2023 vehicle. Any more "over dramatic thoughts" rolling around in your empty skull?
My favorite corvette is the C6 Z06, but those valve problems are always a reminder to not buy one.
You just need to replace the valve and valve guides before they drop.
@@BeepBeepParkie just did, love my car :-)
Only one guy built them prolly why they drop valves
It's to bad GM didn't use this engine in their truck applications... it would be a great engine. With direct fuel injection.
glossed over the valves that are made of glass and sugar
LS7 is the only engine I really cared about or the 5.3
I like the ly6 or the l96 you get them for junk prices
"7" is a Holy number of god's!!
a 4 inch stroke is very large
If gm would have followed motown blocks and focused on head design the gen 1 block would be stronger lasting longer and easily modified but gm chose to electrify there v8 disaster.
Those ls7s are bad boys alright. Probably the most powerful na engines made. If anybody knows different please explain. Factory installed I will add
I agree. Lots of discussion on valve drop in the comment section. I wish there was a way to know the exact # of engines affected to date. I just forget about it, accept the risk and drive it. Life is short.
The c8 z06 has the current record for NA v8 power I believe
Too bad the engineer that designed the heads , specifically the garbage valves must have been drunk ✅
Yet, I just watched a video about how these LS7 engines have a cool problem of dropping valves. Yeah, no thank you.
and shit vavles that drop...
😂
The valves aren't the issue genius. But im sure you don't care about data/facts right?
@@cc23001 Here we go.....
@@cc23001 Well Genius, the exhaust stem separates, falling yet incredibly rare on a stick engine, about 1.6% of them fail, more common on modded cars. Now would YOU buy a used ZO6 and not have the Potential issue fixed Genius? You know nothing about my career path or my knowledge so.....
🤯💯
AHHHHH!!!!!!!!! Ancient POS pushrods. WTF WTF!!!! Use DOHC , like Europeans. Use that huge V valley for twin turbos or superchargers. I like 11:1 compression.. Use titanium pistons to increase redline to 12K RPM.
Reduce weight of Vette by making block and tran as structural members of chassis and rear suspension.
Yes bmw has great results with their hot v engines, absolutely trouble free… Just for reference, the LS7 is physically smaller and lighter than the 4.0 DOHC V8 in the M3 from the same era. The LS7 is smaller, lighter, makes more power, and way more torque. Tell me again which is better for performance? Numbers say its the “ancient pos”
The LS7 wasn't a great success, too many reliability issues. The King of GM V8's was the LS9
😂 all this hype over an engine that is know to self destruct with valves dropping. LS 🚮 not to mention all the TSBs.
🥱 Viper fell asleep on this chat before the chat was invented
So one guy is responsible for all those dropped valves...
Ahh! You beat me to it! He must have forgotten to perform the “wiggle” test on a few.
No, he isn’t an engineer or parts production team. He is the assembler. You are talking like he made it from the ground up. Matter a fact, it’s mostly machines including applying the torque specs. All he did was probably put bearings, and move parts as well as move the torque applying arms.
They were built by different workers lol. There’s a tag near the fuel rail with their name.
@@TrojanLube69that said clearances and play should be checked at time of assembly
it was from a bad batch of valvetrain parts from their supplier that made ls7s drop valves. not all ls7s are afflicted with this valve problem
One man made the 7 L. A piece of his soul is in every corvette god speed what a patriot
Yeah, don't get your panties wet, the guy is a Japanese engineer on work visa.
@@nicT9who cares he did it for america
@@nicT9 You gotta problem with that or something?
@@nicT9not true. The guy who built the engines has his name on every corvette, I can’t remember the name but it was a very generic white man name
@@nicT9Source?? i need valid source
Watching this was oddly very satisfying
Wow. They threw in the dropped valve feature for free?
Thing of beauty!
The improved heads....
Call me country or old fashioned, but I would like to have a cast iron variant.
Done some work on a ls1 recently and ended up putting steel inserts in every single bolt hole because half of them were stripped just from unbolting.
Litterally never heard that.
@@greenhell555 so I guess that means it's impossible, just because the great you have never heard of it? Sounds like my ex.
Love my LS7. Accepted the risk and had the issues addressed. Still, it can be an issue. But, this was my dream car and life is short.
This is the correct answer ❤
Blah blah this is a legend period.. 💪
The wives tales of the LS7 dropping a values is just that a wives tales. One shop outside GM did the first 1600 heads for the first run of the LS7 and miss a measurement on the clearance for the titanium rods. NONE after that first run of 1600 did any heads have ANY clearance issues. Owed 2 C6 Zo6 and have had the heads off both motors and flawless guides. Put that shit to bed it’s so ignorant and uneducated to make a statement like that.
Don’t forget the fact you need to spend thousands on entirely aftermarket head castings to not grenade the engine. Fixed OEM heads still fail just as badly. Some in as little as 1500-3000 miles as some have found out.
All of that just for some dumb quality error in the making of the valves. Why would you not pay attention to every tolerance SPECIALLY when the parts deal with the heart of the motor.
And the valve drops BOOOM. thanks for doing such a gr8 job building these GM. We just love total loss scenarios
Only 7L? **laughs in Ford 553 stroker**
What production car did that come in??
Okay...COPO camaros come with 572 ci. Don't understand your point. These are not made for normal production cars.
Big deal.