Why you should always deck an LS block.
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- Опубліковано 19 жов 2024
- This video shows why you should always deck an LS block even if it has been running before. If you are going to make more power, the deck needs to be flat, straight and perpendicular to the centerline of the crank. It ran as it is, but I don't want to hear you crying when you tried to run 25 PSI of boost and blow a head gasket because you wanted to save money.
I have to agree with you.
The LS block need to be decked and squared.
I find alot take .005 to .007 to true up.
Most are low in the middle.
Nice work an explanation.
Take care, Ed.
Sounds like you know your stuff! Thanks Ed!
WOW!!!... thx for the content... great video.. great knowledge.. 👍🏼
My pleasure!
Do you think its because its a used block. Im curious to see a new block.
The new ones aren't much better!
Well within spec though. 0.004” over 6” and 0.008” over the length of the deck.
You are correct! But I wouldn't say that it's within our specs!
Fair enough... until you're trying to run .036 quench. That .008 might just be kinda a big deal
You mean to tell me that having one hole at .036 quench and another at .028 quench on the same bank is a problem? never heard of it....
@@tadwiltman4875 I agree with the author of the video that there is precision to be gained over a factory engine. I am a toolmaker. I deal in precision daily. However even in my line of work you run into something we call tolerances. Tolerances are the allowable deviation. Typically if a particular piece of tooling, in my case, calls out a tolerance of 0.001" we will still do our best to fall under that. However in most cases a part at 0.001" will perform the same as a part made to 0.0002". Simply seeing a specification like 0.004" over 6" means very little to the performance of an engine on it's own. Without considering other factors such as cylinder volume, chamber volume, the ability to fill the cylinder, gasket thickness, etc, etc...these tolereances could mean a lot or nothing at all.
We hold less than half that over 9 feet where I work, on our feeder rotors and housings. So over a measly 20 inches, its pretty lame specs. It's also quite easy to cut them within a thou or two, so why not? In fact, the way our fixtures tend to hold a block, we would have to go out of way to have a T.I.R of 0.004" or more.
What haas is that? Do you do the boring on that as well?
It is a VF4 with an HRT 310 rotary. I also do the boring on it, along with O-ringing and other features that need to be machined on the heads and blocks.
@@paragonengines1924 cool. Didn’t know if you’d have to go up to a VF5 for the extra Y travel but I guess it’s not needed. Your setup is way cheaper than a Centroid if you’re not doing porting.
If I was looking to do engines longer than 30", then I would have to. I do a lot more blocks than porting heads, so the cost wasn't justified. Also, haas has much more robust OS and lots of support.
😮 not good 😮
Its in spec
It's not!
(SMH) Do you know how many MILLIONS of LS Engines that GM Engine plants (Tonawanda, NY, Romulus,Mi. And St Catherine's, Ontario made from 1999 to let just say 2019. And how many of those are still is service today and are well within specs.?? This is LQ9 6.0 SEASONED OEM block. Its still WELL WITH IN SPEC. Probably the same specs it was manufactured to when it was installed in a GM truck.
Breaking News, You don't need "Areo Space" tolerances on a cast iron 6.0 LS engine with adding some boost make good power. If you're going to demand those kind of numbers, Then you better step up and spend some $$$ on a better block to start with.
Yes, there are quite a few engines with pretty loose specs that run, I'm well aware of that. And yes, you can put some boost to a stock motor and make some power, and plenty of people do! But when a customer comes in to have us machine their parts and wants quality work, we are going to give them "aerospace tolerances" because we have the skills and equipment to do it. It may not be necessary or in everyone's budget, but our customers don't want to swap another junkyard motor in every other weekend!
Lololol have you ever seen a finished Dart block as shipped? When you buy them mid-summer (slowest sales time) verse Early winter when all cup cars are off season and teams are repairing/ building. Even the Big $$$ blocks need quality machining. The busier they are the lower quality goes out the door (with dart anyway) dose not mean the product is bad it means you Always step up to the "Aerospace" tolerances for Quality builds.
Trying to achieve a square block is hardly areospace. Hell, it's barely machining. So what if the manufacturer spits out high numbers of so so spec work. Seeing as it's not hard to achieve a better product why would you not?
@@whiplashmachine wish I could up thumb this more than once! My comment using the word "aerospace" was in direct reference to Pile81 commenting that" Aerospace tolerances Were not necessary and to step up to a better block. What he will never understand is better aftermarket block or 20+ year old 200k mile used block. Machine it properly don't cut corners. It is just not that hard. Using a nice machine such as this to perform the task or using a old 85b block master.
@@whiplashmachine BTW nice channel and content subbed !