Visit Auto-Guild.com to get your free pre-order of the LS Swap Survival Guide eBook. As well as other cool eBooks and cool car related posters too.

Nice presentation. Thank you for this video, I just learned that the 823's that I have on my motor (6.0) are the "best" heads for what I'm looking for.

@leinie6683

Ай бұрын

me too!

Well explained sir! Why don't you make the poster available as a Christmas present? Lots of happy walls you would make...;) Great video!!!👍

@AutoGuild

7 ай бұрын

Working on it!

@roshadhorton4836

7 ай бұрын

Rt bro he should

@huntboyrufus

6 ай бұрын

Buying it!

@javonsumpter9678

6 ай бұрын

Right og,salute

@boostlab5137

3 ай бұрын

​@AutoGuild where can I find this poster, I would buy it!

Very well put together, nicely done. Thanks for taking the time to do this.

i'v got 823's on my 2012 chevy SS/Holden Commodore SSV L77 6.0 soon to be on my L77 413 stroker with 98mm Turbo currently being ported for Turbo just pocket ported intake and full opened port on the exhaust to suit the Turbo, they had pretty good flow at stock so we didn't get carried way but were looking for somewhere 1500-2000hp zone with a fully built forged everything, what is crazy to me when I started drag racing I use to run 11.30's with my car which back then that was a killer time move on to taday 35 years later and my car does that with just a otr, 3" exh, and mild cam and a tune.

Very good explanation of all the head types I'm a mechanic of over 25 years but have now acquired a truck with an LS and it's my first one my specialty is older carburator cars but want to build this LS this info will help a lot. Subbed

Glad you are making videos again!

Very professional presentation. First class all the way.

Happy to see you put up a new video! 🤠👍

i need to watch this more than a few times great work and Thankx for sharing

Pulled an L33 out of the junkyard awhile ago that came with 799s. After watching Holdner's video and reading the article, I hand ported a free set of 862s. Can't wait till it's up and running.

@mrorganic13

2 ай бұрын

How did you find an ls3 at a junkyard? In what car

@lacboiatl

Ай бұрын

​@@mrorganic13l33 not ls3

Very timely video. I'm exploring the idea of doing an LS swap into an 80 series Landcruiser and while I do like the idea of HP, I am more interested in lower end torque.

I did something weird. I took a set of 799 heads, had them CNC ported to accept 2.02"/1.57" valves, shaved them down to 59cc, and put them on a 6.2l I built. With a slightly domed piston, that got me 12.6:1, and about the same flow numbers as the rec port heads.

My DBW 5.3 donor from an 03 avalanche has the 706 heads. People say they crack but most of the ones that crack are from 2006. It hauls ass in my 82 c10 Squarebody.

@user-cp5vl9ot9x

3 ай бұрын

As a mechanic... I see a lot of "cracked" lq4 , 317 heads. Not really a crack... more like coolant weeping from head bolt area when heads are warm or hot.

U got me. New Subscriber. I have alot of parts laying around. Wasn't sure what to do with them. Yur video pop up 100%. I'm going to put the bigger intake valve in my 706 heads & do a little polishing. Thank u.

You’re awesome!! Thank you for sharing this information!!!

Awesome info brother

Love your videos !! 😊

@AutoGuild

7 ай бұрын

Thank you!!

Great video and explanation

Welcome back!

Great video!!

Very glad my junkyard 5.3l came with 706 heads!!! 😊

Thanks for making this video

Great video thanks for sharing much appreciated!👍👍

This video was so Informative 🔥. Now to watch yur engine video's. See what to keep & throw out . Thank u.

Nice video ive been waiting on this i had the original factory 706 heads now i have 862's and auto guild your absolutely right about the 706's,862's and i don't know too much about the 895's let alone have never seen none the previous owner didn't change oil regularly and a lifter had literally grinded a lobe/cut a groove in I'm a Gm fan but i like all brands but the gen 3's are notorious for having bad lifters,i maybe wrong

Yes 👍 I got a free 4.8 with 862 heads

I love this! Awesome, I want this poster! I could be wrong because my eyes hurt looking at all them numbers, but on the chart in the “engines” category for the 243 and the 799, you have the LS2 listed twice each. Thank you for the video and the poster I will be getting 🙏

@baby-sharkgto4902

6 ай бұрын

10:47

@AutoGuild

6 ай бұрын

Good catch, I corrected it. Ill upload these to the website soon. Thanks.

Crazy info thats mad love it💪💪💪

@AutoGuild

6 ай бұрын

Appreciate it!!

Amazing video ❤

@AutoGuild

6 ай бұрын

Thank you so much 😀

Good information here. Like to learn more

Awsome content Thanks!

@AutoGuild

18 күн бұрын

Thanks again, its only the 3rd time I've ever had a super thanks. Let me know if there are any other videos you'd like to see. Cheers.

Thank you sir!!!!

thank you

Good job wish someone did this years ago. Another thing about smaller intake valves under half open actually flow more air make power faster with higher velocity better low end tq but the large valves higher flow fully open increasing higher RPMs. The intake runners the longer, round shaped and small = high velocity and better low-end tq but rpms fall off early then the, shorter , rectangular shaped, large runners, = higher flow laggy down low but higher revving. The compression chambers not only change compression but the shape helps with atomization. I don't run higher then 11to1 on pump gas on n/a but my boosted ls6 I swapped my milled 243s for 317s and ls9 gaskets gave 9.7to1 so I can run 12-15 psi safely on pump gas. Now if I ran the higher compression heads for the extra 10-15 hp i'm running a higher risk of detenation so i'd need higher octane or if my tune isn't perfect my motor is toast. So at over 600hp if I really need that extra 15hp I'll just put my wife on a diet. lol

Love this

Compression ratio gains range from 4% to 15% per point, all depending upon execution... Design of combustion shape is everything.

Спасибо вам за это видео! Очень поможет при выборе двигателя для проекта! 🤝

This video is right on time! I’ve been trying to figure out what brand and type of heads to go with to replace my OEM heads. My goal is Responsive Street beast Occasional racer or rolls. Any suggestions on head brand and type to complement my current bolt-on's? 2009 TBSS AWD 6.0L - TVS2300 ~15 pds - Kooks longtubes headers - Mild cam - Built transmission - stock bottom end -93 Octane

I have a lq4 in my truck now. Planning on going 243’s and a tbss intake with headers and a truck Norris cam. Should wake it up haha

Man, I've missed you!

@AutoGuild

7 ай бұрын

Thank you. More to come. : ) Let me know what you want to see next.

@meatrobot

7 ай бұрын

@@AutoGuild I'm not an engine builder, so I have no clue what to request. I like everything you've done so far. 🤷🏼‍♂️

I bought an 09 Sierra from my dad quite a few years back after my brother bricked the 5.3 (LMG) that was in it. My brother had it replaced and the heads are 862, but I don't want to pull engine parts just to check the casting number. He was told it was another 2009 engine. So I really hope it's another 09, but with 1999-2006 "862" heads. I guess it doesn't matter much because it's *_waaay_* quicker than the original engine. Supposedly, the shop that built it bought some factory rejects because the cylinder angles were a fraction off. So they bored them over and to the correct angle and put sleeves in them, to bring them back to factory bore.

Good Article. Is there anyway that all this information can be print out.?

2009 1500 LS silverado 4.8L. Doesnt have dod or afm. Will be putting on a BTR intake manifold and headers and port polish heads. Thoughts

Lq9 ported 0.030 with 706 heads defintely gona watch this video over again.

THANKS MAN¡

Where is the cylinder head compatibility video ?? Waiting for it 🤙🏼

Awesome video, I just didn't see Aluminum LQ4 243 heads? I have a 2003 Chevy express 6.0, 243 heads Alluminum, from factory

youre back :D

@AutoGuild

7 ай бұрын

Yes, more to come. Let me know what else you'd like to see.

Do you mind if you make a video about Ls blocks please ❤️❤️great video

I'm confused, did 799 heads change at some point? I have 799 heads with 1.575 exhaust valves that came on an 05 LH6. Is the difference between 1.55 and 1.575 so small it just wasn't worth noting?

LS7 heads are 12*, not 11*, they can go on an LS3 bore when using a smaller exhaust valve, just saying.

GM was concerned that HD truck buyers would not trust the durability of aluminum heads at the launch of the LS truck motors. After a couple of years they went to aluminum.

Which ones are the best for boost on 4.8 and 5.3 and 6.0?

Excellent video but the l76 and l77 engine were first fitted to vehicles in 2006.

I have seen LC8 / LC9 engines with a 243 head on one bank, and a 799 on the other side.

I'm building a 99-02 LQ4 with plans to do lsa supercharger, what would be best heads to use?

Do you have videos or info comparing blocks? My LS book is outdated and is sparse on Gen 4 info. Would be helpful to see verified information on weight differences between alum and iron as well. Lots of anecdote and hearsay on the forums.

@AutoGuild

6 ай бұрын

Its about 100lbs between LS Iron and LS Aluminum block. Check out my SBC vs LS video. LS iron is 215 lbs and LS alum is 115. Im def going alum with my build.

A follow up video comparing flow numbers on maximum effort ported versions of each head would be awesome. Not many people in the modification game would settle for a stock as cast version of any of these heads when building their engine. Especially those doing normally aspirated builds. It would be cool to see the same breakdown showing what a well ported version of each can obtain.

@AutoGuild

6 ай бұрын

For sure, I want to do a video comparing porting and aftermarket. Its on the to-do list.

So do all LS heads fit all blocks? And are the cams the same in that sense? I always see the 4.8, 5.3, 6.0 and 6.2 but no 5.7. It makes finding parts hard here in Australia

@AutoGuild

5 ай бұрын

Almost all are interchangeable. Im going to do a head swap video soon, Ill break it all down then.

706 gang

Can you do a video for the gen 5 heads!?!?

Just watched the vid, but I'm confused. I have a 2008 Sierra 2500 LY6 6.0, with rec-port heads, but the only casting mark I can find is E247. Any insight?

can you do this for current LT engines?

If you can't figure out why they did it, just assume it was for cost savings.

Nice content. Noticed one error. On group 3 (iron heads) you have "4.8" next to the heading. Iron heads never came on a 4.8.

@joedanero5360

4 ай бұрын

Yeah. Looks like they only came on those two year 6.0's Good catch.

Would it be wise to put a small valve 895 head on a stock lq9?

Can I run a Ly6 with gen 4 harness and 58x crank, 4x cam, gen 3 intake/throttle body/heads, 6l80 Transmission?

L92 heads have a 15° degree valve angle not 11. Small thing to fix in the video

BUT slide 5 lq4 / lq9 won't domed pistons / turbo boost cure lo compression?

My L96 just keeps on looking better and better all the time......2010 L96 178,000 and going stronggggg

Hello, I’ve watched countless videos and find myself stuck and nervous to move forward. I’m hoping someone can help me. I have a 2003 stock Sierra 2500. LQ4 with 317 heads the exhaust bolts broke off in the head I went to extract them and made the problem worse, the extraction bits broke off in the head.😢 However I have a gen 4 5.3 motor from a 2011 I was going to put up for sale. That has the 799 heads. My question is will I have to tune the ecu with that swap?

So, are ls4 heads a good option on the other LS engines then?

What’s the best heads on LQ4/LQ9 with a cam? 243 / 799?

Why is my LQ9 10 plus on compression ratio? You didn’t mention that part about higher compression on the engine

@michaelspicuzza2016

6 ай бұрын

Exactly the lq9 is a higher compression motor that's why it was 20 more Hp . Had different pistons than a Lq8

The ctsv come out in 09 good brother 🫡 but loving the video and it kinda answered the question for me because I came across the set of LS7 heads that I was wondering would they be an upgrade for my LSA?

❤

My heads dont have that stamping, its on a 2000 chevy 2500 silverado 6.0

I ordered the cylinder head poster and never got anything... just wondering when you will ship it

The chart you have near the end shows the Iron 373/873 heads as being fitted to the 4.8L LR4, which is incorrect. May want to double check your chart before finalizing it for sale.

@AutoGuild

6 ай бұрын

Ah that's a bummer, I caught that and fixed it but then forgot to update the screengrabs. Thanks for the catch. It will be updated on the downloadable eBook, working on it now.

@mythos000000025

6 ай бұрын

Are you sure the 799 heads have 2.00 intake valves? I thought they were 1.89"

@rwt8851

6 ай бұрын

@@mythos000000025 799 and 243 have the 2.00 intake. but they do have different exhaust vales, IE 799 have 1.575 valves and 243 have 1.550 valves. why who knows it's a gm thing. haha

@mythos000000025

6 ай бұрын

@rwt8851 thanks...I forgot to measure(didn't really matter to me at the time) the valve sizes when removing and cleaning my heads for my engine build. Considering the time it took to finish, I do wish I had sent the heads off to be stage 2.5 or Frankenstein modded for more n/a power. Won't be a problem after boost but....

8.3 to 1 compression ratio is great for superchargers

What ever head you have or can afford is the best for your project at the end of the day if you shove enough boost down there throat it will meet your goals. But you need to know what your goal is on horsepower at the end of the day. I’ve ran god I couldn’t tell you how many different combos.

@AutoGuild

6 ай бұрын

I think that’s true for 90% of the people. Run the head u got. Especially true if going turbo.

Are they all cast heads? Or are some Billet ?

Welp I got 2 pairs of winner I have 862’s on my 4.8 and 799’s on my gen 4 5.3 I’m just gonna upgrade rocker arms and valve springs and have someone port them

I think they have the pic wrong. Where is the square port head. Never heard of a raised port head

Wait tho... My LQ9 in my 05 EXT is rated at something like 11.X:1, but it has low compression heads?

I have a 1999 2500 6.0l/4l80e 4wd truck. Build date. 12/98... and a magnet sticks to the heads. For sure they are iron.

Is there a reason why my 99 silverado with a 4.8 came with 862 heads? From my understanding the engine is supposed to be all original when my dad bought the truck in 2003. Fast forward to now that i blew it up i tore it down and it has 862 stamped on the cylinder head. The truck was made in 11/98 so could it be just super early models got the aluminum heads

@AutoGuild

5 ай бұрын

862 would be the factory head for that year truck. Those are good heads, stick with them.

@Alex68dash

5 ай бұрын

@AutoGuild the heads that the 5.3 I bought to replace my 4.8 also had 862 heads on it so I'm keeping them regardless loll. But still I would've thought my 4.8 would've had iron heads instead of aluminum

What ls cylinder head would work best on my 1969 vw beetle?

@AutoGuild

6 ай бұрын

I dont know VWs. Sorry : (

Can any LS heads be used with a twin screw supercharger?

@Velocitist

7 ай бұрын

Most likely, but the question is depending on the head design, because it’s not as about the ports, it’s about the shape of the dome on top within the pistons, it changes the shape of the combustion chamber, which changes how the engine behaves, so, in theory, any of them could have a supercharger, you just need the right inlet manifold to match up to the ports, but depending on which one you’ve got not, all of them would be worth it, because in theory to supercharge one engine with this cylinder head, it might be worth it to get that other engine that makes the same power with a different cylinder head design.

Will 706 fit on my 08 silverado 5.3? Im new at this. And trying to understand.

@One_LuvZ

20 күн бұрын

They'll fit

For ls 4.8 or 5.3 243,799,706 heads work good if you going ls 6.0 821,823 heads are the best

Rich is the goat

The 3 main ones I see are 706/862, 799/243, ans 317. They're all great cause they're good for different CRs. I'm building a 359 stroker with 7cc dish pistons, and 317 heads for a 9.5 ish CR for boost.

@XxMusclecarsxX

7 ай бұрын

nothing wrong with the 317, on a 6.0 they have normal compression. ported mine to around 285cfm

@danielsullivan9865

6 ай бұрын

We’re running 317 ported with 205 valves, flat top pistons on a 366 in.³ TwinTurbo, makes over 1300 hp on 26lb boost

The iron heads are for marine applications.

Will any of these fit and help an L29 7400 vortec or am I buying aftermarket??

@AutoGuild

6 ай бұрын

L29 is a newer big block so it uses a different head. Unfortunately I don’t know too much about that engine. Do a google search for “L29 cylinder head upgrade”.

What are the best heads for a high reving na 4.8l build?

@AutoGuild

5 ай бұрын

Any aluminum head except the 317 and 035! Just be sure to upgrade the valve springs.

Little chief heads on a old SBC gen one same..out put..I own four of each hp torque is hp torque..

You got one thing wrong about the ls9 heads. Ls9 are cnc ported from factory and flow more than the lsa. I would also say the ls9 heads are more rare than the ls7

I came here to apologize, ive been watching your videos for 2 years liked every single one that i watched but never subscribe until today