LET'S TALK TECH-243 VS 862

LET'S TALK TECH, ANYONE EVER SEE A SET OF STOCK 243 HEADS FLOW 270+ CFM? WE COMPARED 243 HEADS TO 862 HEADS, PORTED, CHAMBER WORK & BIG VALVE.

[@DM-qp7do]

I am beyond grateful that this man does all these tests. I have 2 trucks 1 with a LM7 and 1 with a L59 and I do need to know this stuff.

[@DillonAuto]

My 2002 L59 has the 862 head. Did the very similar but different castings go on the different fueling systems? It doesn't seem like a necessary thing to me. I just don't know the history of it.

[@HeadFlowInc]

862’s w/ 1.89”/1.55” valves ported flowing 254 cfm @.600”. Intake bowl 91% blended fully, maintained swirl ramp, valve guide reduction/shaping, reduced rocker bolt lump but no break through ending port size 208cc. The port didn’t saturated continued to improve flowing 268cfm @.850”. 215cfm @.400” This was a test to verify what the 1.89” valve can actually flow. JD

[@shadowopsairman1583]

What bore and stroke?

[@shadowopsairman1583]

Really like to find a spare 862 set to do larger valves and porting for a stock LR4 (flat top 4.8) minor power boost without requiring forced induction.

[@HeadFlowInc]

@@shadowopsairman1583 This set is being setup specifically for a 5.3 with the stock 3.785” bore and 3.622” stroke with a cam.

[@HeadFlowInc]

@@shadowopsairman1583 You’d be surprised what the oem 862 heads can do with the right camshaft, they key is don’t over cam it! Cams like the Sloppy Stage 2 are too big for a 4.8 unless you’re prepared to run a 4000+ stall converter, 3.73-4.56 gears and Rev the engine to 7500+ rpm. With the tight cam you can make 400+ HP and great torque I recommend the Summit 8720 as a max size in a driver. If you want to keep a stock converter you’ll want a cam smaller than the 8720.

[@martinez1701a]

@@HeadFlowInc your right ive seen several stock LM7's and LR4's making around 400hp with just a cam, these guys keep their cam specs a secret so I don't know what they were.

[@engineheader]

one thing a lot of people picking cylinder heads forget is not just port flow but the velocity of the air moving in the port. putting to big of a port on an engine that will not support it. just putting a huge port on a stock engine will not improve power, it could actually hurt power. the same thing goes with the intake manifold.

[@bobbywilliams5657]

You are the new King of LS motor DYNO Keep up the good work 💪🙏💯👑👍

[@richardholdener1727]

it only took 30 years!

[@motoxray]

Hey Richard, props to you, love your vids, your attitude, work ethic, curiosity etc. I'm from Oz, ( Down under), building a VC commodore, 1980 Australian version of an Opel, light car (about 2400lbs) with a L98 stroked to 403ci (4" Forged crank, scat rods, forged pistons, ported 862 heads, hollow intakes, Ti retainers, Howards 226/232 .612/621" with 1.8 rockers @108 lsa, with Speedmaster ITB's (Stack) injection, Haltech ECU, etc. Hope to go ~550hp at the flywheel. Have been tempted to run a set of CNC'd 241's for the torque numbers, but the car is so light, I think the recangles will be pretty good anyway. I like the prospect of an NA engine, though I know boost would be fairly stratospheric! The sound of a hi revving NA ls is very appealing! ! Thanks for your tireless work, really appreciate your no BS approach....

[@richardholdener1727]

sounds like a great project, I love the little Opel GTs (baby Corvettes)

[@drother]

what about the promaxx small bore heads? 240cc runner that is 1/2” longer than cathedral ports.

[@Kreegers_performance]

I got 862s on my LQ4 with a stock LS7 cam and a garbage speedmaster aluminum intake. Has a 4l80e in a f body and it does good

[@turbokp....479]

I'm about to do the same exact thing

[@martinez1701a]

I gotta tune and dyno my setup to see what its actually making, LM7 216/220 .560 114lsa camshaft 862 heads light porting and flat top pistons so im at 10.20:1 compression. Its swapped in my 99 trans am and it is noticeably more powerful than my stock LS1 (which took a crap on me)

[@deqkraft3870]

Did your bearing mains go on the ls1?

[@martinez1701a]

@@deqkraft3870 couple rod bearings, when I took it apart looks like the person who owned the car before me abused it. The engine started to knock about 6 months after I bought it, it probably knocked before but it was a weekend car so I didn't put a lot of miles on it.

[@derekr1854]

Running ported 799 flows at 322cfm at .700 lift. Weisco pistons -3 dished in my 408 and a stage 3 tick turbo cam. Planning for a 88mm turbo on E85. Heads will flow 330cfm but at .950 lift

[@richardholdener1727]

more than enough head flow for an 88 mm

[@thetriode]

Gotta say bold prediction on V8 vs L6 that V8 wins even with the same cubes and compression in most cases. The reasoning behind that being that the V8 with similar head flow will have 33% more port flow than an L6. Most domestic push rod L6es don't have great heads either if you're honest about it. Based on what I'm finding on the net at first glance, the 300 head isn't exactly going to flow any more than an E7 would. On my 258 I'm going to cram boost into it. I'm lucky that a 4.0L head supposedly flows something like 200 CFM, so that's going on first. That'll be a big head start compared to many domestic push rod 6es of the era. For engines that are induction crippled and don't quite have the aftermarket that many V8s have it's probably the best bet.

[@Businessecomm.Ai1]

So is the 862 put out better power as stock? Or the 243 does?

[@dfxdallas]

Like a patient professor 😂

[@swappedoutZ71]

Cnc ported 243 with chamber size of the 862 is what I'm running. With big valves. This was a noticeable difference from my valve job only 862s on a 6.0

[@Gonzalo6O]

How do you think 862 heads with cnc port job and bigger valves would do on a 6.0?

[@swappedoutZ71]

@@Gonzalo6O they would be very torquey I would imagine. The 243s seemed to spread the power out, and slightly amplify it. Bottom line they just flow better and make more power but 862s are good for low and mid

[@swappedoutZ71]

@@Gonzalo6O the setup I have is pretty much what you're describing but with the runner design from the 243s instead of the 862s. Both good heads and similar design but one was made for trucks and that's the way the power is shaped on the dyno chart. It depends on your setup. What vehicle are you running and what do you want out of the setup?

[@Gonzalo6O]

@@swappedoutZ71 Im slapping an LQ4 into my 1991 Single cab. I am going with a t56 Manual transmission. I want to make the truck lighter it has a 4.3L and it drives like shit. looking for some moderate power around 400-450 nothing too crazy, I bought a 54-459-11 cam for the 6.0

[@swappedoutZ71]

@@Gonzalo6O 862s if u want daily driver power, 243s if you want more power at high rpm

[@salinajt1]

Awesome doing a awesome job 👍👍👍

[@goodfellasinc.5648]

The reason why you're losing on the bottom is head design when you do Port work a lot of people take that swirl away and try to make everything even and that's where you lose all your torque you're losing three to four percent plus your cam valve size compression ratio there's a lot to it mostly is on your head you can either build bottom end torque or lose bottom end torque when portying obviously it was all in stock trim but the 243 had 706 head is very different on that part of the head yes you can port a head to a certain power band Believe it or not upper strength or lower bottom end strength

[@bluebulk]

"everything need a turbo" agreed!

[@markim5087]

I bet he would cook up some freaking frys to shame Mac Donald’s, lol..

[@melissamalone1530]

I may be wrong but I believe the smaller 706 head works like a 1 3/4 inch header vs 1 7/8 a little more bottom end comes from smaller passages I thought it was like common sense big turbos have less bottom end in my experience on my diesel trucks

[@swappedoutZ71]

Every video I see claims the 7/8 don't lose anything over the 3/4 everyone claims the 7/8 makes more tq

[@mewrongway]

Awesome Richard!! Thanks

[@NYRM1974]

Looking at Cam Motion push rods and a LS Stage 3 Hydraulic cam roller as well as rocker arms.

[@surreallife777]

So far I’ve never found anybody who’s built this kind of engine. I wonder what combination will produce a quick revving, high revving responsive Ford Windsor V8 for the street. More like Ferrari 355 V8 or an F1 engine. With no flat plane crank of course.It would be really interesting to see what combination would produce this kind of engine? Short stroke, small displacement, compression, which cam, which heads? etc.

[@mjmarinara]

Thank you for all the great content as always @Richard holdener still trying to find a concrete answer though everywhere on the net as to how a stock 862/706 compares to a stock 243/799 MILLED TO 61.5 chamber on a 6.0!! Would be a similar head to a stage 2 sort of 706 then no? Thanks again!!

[@richardholdener1727]

there was only 2.5 cc difference between the 706 and 799 heads- i recently ran another test with BTR where 243 heads made more than 862 heads-so all the 243/799 guys can now rest easy

[@shadowopsairman1583]

2007 LR4, 862s.

[@justplanefred]

Maybe the Gen 4 could make more power at that point but you just sunk considerably more money in the Gen 4 to compete and hopefully spending more money would make significantly more power power. Do you think the VVT is what is making most of that extra torque in the L83 or mostly the compression?

[@TheGamersRace]

The VVT for sure.

[@howardtroup9010]

Could you test a high compression 5.3 bored to 3.9 on e85?

[@Caddydaddy2003]

Is the difference on 243 head chamber width from org application 5.7 LS6 vs the later 6.0 LS2 application. I have flowed 243 on SF600 2 sets one from a ls6 and ls2 one set went 248CFM other went 258 CFM that was on a 4.060 bore. Did you run into port going turbulent on your test around 550 or 600? I never checked chamber width I know they never measure 64cc one came in at 68cc and other was 65cc

[@ryancrisp6786]

Any update on the 243 heads flow numbers using the large bore fixture? I'm watching this wondering if you somehow uncovered a secret on making more power with the larger bore and keeping the heads as cast.

[@jesusdeleon8272]

I got a 5.7 ls1 with a ls6 intake what head should I put they told me 862 heads port and polish’s are Better then 243 heads port and polish what stock heads port and polish should work best with a ls1 block and stage 4 cam with ls6 intake

[@richardholdener1727]

the ported 243s seem to be a little better when done correctly

[@independentassesor2630]

@@richardholdener1727 High Richard, is there any big difference in porting 241 heads vs 243 if I go all out? Also which heads would you use if you wanted to make the most power out of an n/a ls1 5.7 litre

[@Phil-rs5wl]

My LH6 aluminum 5.3 came from the factory with 799 heads

[@kennethpowers8995]

lot of 5.3s come with 799s. Specifically 2007 and on 5.3s and the L33 high output 5.3 Vortec.

[@whyfjwhts]

Wen we going to see the big bang on the l67 ?

[@MarlHellbringer]

Richard, I was going back and rewatching a lot of your LS cylinder head comparisons. I was specifically looking for the 373 and 873 heads from a 05 LQ4. I really don't see ANYONE testing these heads vs the more popular heads. 799 etc. Is there a reason for it? Those truck motors are everywhere. Part of my reason I am asking is I am about the build a motor to stuff in a Ranger for a burnout rig.

[@richardholdener1727]

lq4 had 317s

[@MarlHellbringer]

@richardholdener1727 What are your thoughts on the 317's? I'd like to make 500 ish hp. I'm thinking a Truck Norris cam and stock everything else but manifolds

[@ponchgp1970]

I know that a 241 head will flow 270 cfm @500 without the sparkplug. Just ask how I know lol

[@richardholdener1727]

yep-been there

[@Dooguy]

Just bought a low mileage older F body. 5.7 headers, full SLP exhaust, cat delete. Tqrv2112 cam, z06 intake as well and tune......dyno sheet he provided states 402.6 @6228 rpm and 356.1@4972. 409.1 with WCF HP and 362.1 torque at WCF Does this sound legit numbers. Or should it make more. Thanks

[@NYRM1974]

I have two brand new 862 cylinder heads..... This is for my 2004 Chevy Trailblazer EXT LS 5.3L V-8 the question can I use them or did I get ripped off. I was told can be used on my Trailblazer. The heads are Aluminum from Allied Motor Parts. I got the 862 as the 706 heads have been known to crack and being on a budget trying to keep costs down...... For rods any suggestions keeping it OEM for now. Just want to get it back on the road.

[@richardholdener1727]

862 works same as 706

[@NYRM1974]

@@richardholdener1727 Thanks sent you an email on the subject.

[@docsmallblock6584]

Hey, where's the atlas 4200 engine videos at?

[@richardholdener1727]

THAT COMES AFTER THE TEST

[@PlatinumPlusOutDoors]

Im interested to see dyno #s on (valve jobs, combustion chamber work) worked 317 & 862 vs the trick flow 225s on a 408 or 416/418. Whats real time hp/tq results and is it worth buying trick flow vs investing in machining OEM heads

[@richardholdener1727]

Properly ported, the 862s can make as much as 225 TFS heads-but you have to be very good at porting

[@itwoammend1735]

PRC of Texas Speed says their stage 2.5 ls6 243 flows 316 @ .600. Not sure the bore they used. I hope they are correct. smile

[@richardholdener1727]

IT SHOULD

[@itwoammend1735]

@@richardholdener1727 Thank you. Have you ever done testing with the Cleetus McFarland N/A bald eagle 600/600 227/234 cam on a 6.0 with a set of heads like I mentioned above? Has an Edelbrock dual plane and Brawler race 750. I did most of what you said except the cam, I will switch to the comp 469 if you recommend it. Thank you again for all you do for us!

[@bluecollarhotrods9781]

I want to say they were flowed on a 3.900" bore. I emailed them once, as I own a set of PRC Stg 2.5s - that was the reply that I got.

[@youngsoprano222]

Will I get anymore power by porting and polishing 862 heads for a 5.3? Adding long tubes, a carburetor and a cam upgrade, or will it bog down because of the heads?

[@richardholdener1727]

yes you gain power from proper porting, please see the many ported head tests-it won't bog

[@youngsoprano222]

@@richardholdener1727 thank you very much

[@idriwzrd]

If you made fries, they'd be better than America's favorite fries.

[@jhalscott]

My 2008 Tahoe PPV 5.3 LMG has the 243 heads on it from the factory.

[@deewyte5081]

Yup but most have 799. People if you want ported heads look at Wilkes. Picked up a set of 243 heads ported for under $1300 shipped thru a dealer. No core charge

[@jhalscott]

@@deewyte5081 very cool. I will check them out.

[@carado1984]

@@deewyte5081 any before and after numbers there? I heard he does good work. Stock sized valves?

[@MrScottt28]

Yeahhhhhh we're live!

[@phillipwilliams8805]

Don’t racers use vortec heads on the small block 350 for better flow.

[@cuzz63]

if they cant run Aluminum

[@juliosandoval8244]

Ive heard 706 heads work good on a lq9 or lq4 combination if ur going boost.or even ls 823 or 821 heads.

[@richardholdener1727]

every head works well under boost-the stock rec port heads make more than stock cath heads

[@juliosandoval8244]

@@richardholdener1727 ok got it i think ill just do 823 heads

[@franw51]

For my Ls1 camaro F body, im doing GMPP hot cam (want durability, drive ability, fuel mileage) 243 heads, Ls6 springs, holley low ram, 92mm throttle body, 36lb injectors. Should be a 400 whp motor. Fingers crossed. Not lookin for more

[@richardholdener1727]

you won't like the Holley Low Ram on that combo

[@franw51]

@@richardholdener1727 hey thanks for your response. Love your content. Suggestions then?

[@Ws6Ms]

@@franw51 probably just a stock ls6 I take or fast 92 should be great for that

[@TheBanomanew]

I have stock 243s dual beehive spring pac .660s on an ls1 with a 226/232 112+3 625/625 lift cam. Stock ls6 intake and 78mm tb. Made 442hp on mustang dyno. From 3k to 6400 its almost a plateau of hp and torque.

[@franw51]

@@Ws6Ms I ended up with an LS6 intake. Good call

[@phreaktor]

What diameter exhaust would you run on a Gbody with a 6.0L, stock 862 heads, Gen IV pistons/rods, 92mm TB, LS6 intake, Sloppy Stage 2 cam, and 1-7/8" mid length headers? 2.5"? or 3.0"? I'm looking at the Pypes systems.

[@richardholdener1727]

a 3.0 will make more power but not much

[@larrytemen4789]

Where is the video of the tests?

[@johndienst3194]

On the big block I think he is talking about the dowel pins for the cylinder heads

[@travispfannmuller7717]

I believe they were offset boring with factory small bore to unshroud the exhaust valve

[@richardholdener1727]

head dowels

[@zx10Boyz615]

Would a set of stick 243 -.30 milled flow just as good as set of same heads ported on gen 4 cammed 5.3 ? Or would it be better to kill and port for drive around street performance?

[@richardholdener1727]

porting adds flow, milling adds compression

[@mirabalmedia]

I’m building a 6.0 bored .030 over. I’m running a BTR stage two truck cam 212/218, BTR chromoly 7.4 pushrods, BTR rocker arms, forged pistons and rods. Also, a set of 706 heads. Speed engineering 1 7/8 headers. The engine has 11.2 compression ratio. What do you think about that set up?… I think I could of went 7.45 pushrods

[@richardholdener1727]

you need to run good gas in that

[@mirabalmedia]

@@richardholdener1727 yes, my tune guy said it will be tune for 93. He told me to go with the Cometic .060 head gasket to put me at 11.2 compression. I also have Mahle dome volume is -4. BTR .560 lift blue beehive valve springs. BTR v2 trunnion kit. LS6 valley cover, Everything else is all AC Delco parts like oil pump, water pump, sensors & so on. And everything else is BTR. Also, ARP bolts throughout the engine. I still haven’t put the engine in yet. I’m still wondering how will the engine run.

[@clintlawson2455]

Got a 96 votec 350 motor ,reg 87 350, 327 large journal , 302 with 11:1 pop ups what would you build got 461 heads 462 ,291 victor jr got 284h comp cam and 294h solid or hyd lifters i got both

[@richardholdener1727]

the bigger motor would be better

[@timtucker8270]

Richard. I know that this video is not about the 317 heads. But would it help the exhaust flow if the D port exhaust was port matched to the exhaust manifolds?

[@richardholdener1727]

I don't think very much

[@maxinumarmor]

Can you compare the 823 square port found on the 2500 and 3500 silverados? It has a 68cc chamber and 317 cfm intake and 252 cfm exhaust when tested.

[@damianvelezgonzalez8557]

Good morning I always watch your programs and I like them a lot. I ask, I have an original 5.3 LM7 engine and 862 covers with a pressurized shift 68 inlet and outlet 90 with a Fitech injection system for 750 hp with a 102 millimeter jog, which lift shaft would be good for the street, thanks

[@richardholdener1727]

pressurized shift 68 inlet?

[@MississippiDan1]

Sounds like a job for truck norris...

[@darrel70043]

Are 862 gen 3 heads a direct swap in place of gen 4 243’s? I’m hearing knock sensor is in a different location. Thanks!

[@richardholdener1727]

the heads are a direct swap

[@bluecollarfox916]

Rich would you enlarge the 862 valves to 202 if you had the 3.898 LS1 bore? I’d be doing a basic port job and unshrouding the intake valve. Or would you just leave the stock 862 valves. It’s gt45 China turbo motor.

[@richardholdener1727]

bigger valves can add power on the 862s

[@traviswren6364]

4.8 with ported polished and milled 20 243 heads and summit stage 4 ls pro cam how much power will this make

[@richardholdener1727]

IS IT FOR RACING? BIG CAM FOR A 4.8l

[@davidwalker5748]

I see taking a 6.L and stroking it to a 408 can the same thing be done to the 5.3 L since they both have the same stock stroke just a different bore size in each one and with the stroked 5.3 what would the displacement be after that

[@richardholdener1727]

383 on the 5.3l with an increase in bore size of 3.902

[@alejandroolmos1840]

what is the best head to run on a na lm7 with header,e85 and tbss manifold , the stock 706 head or worth the upgrade to a 243/799 head ?

[@richardholdener1727]

I doubt you gain much

[@alejandroolmos1840]

Thanks for the reply! and another question would porting either one be worth it ?

[@clintlawson2455]

Sometimes we just need 4 shots of great bourbon

[@michaelbarnes2937]

Do the stock 243 heads work well with a BTR stage 1 truck cam and 5.3 vortec engine

[@richardholdener1727]

yes

[@bobbyowens8451]

Did it have a good 5 angle or radius valve job,if so there you go..

[@richardholdener1727]

it was stock

[@benfrank2652]

New to your channel . I have a 5.3 lm7 with 862 heads What would be best set up to reach 500hp

[@richardholdener1727]

SEE THE 500-HP 5.3L VIDEOS

[@wilhelmvo6399]

Do you have a website so we can see the full graphs of all these test from idle up?

[@richardholdener1727]

WE DON'T LOAD AMOTOR AT WOT AT IDLE

[@elseco2341]

6.0 with 224 231 cam headers tbss intake and 243s 92mm and k&n hoe much would I make to the wherl

[@elseco2341]

Wheel

[@rockroll9513]

Over 400

[@bradp9938]

kzbin.info/www/bejne/pl6wcn-udtOnbbs

[@richardholdener1727]

maybe 400

[@reyperez3424]

Do a 226/232 lsa114 .600 That’s what a friend has 07 Tahoe ls2 from a tbss 6.0 and runs 13.7 Corvette TB and stall but can’t get off the line above 2000 without spinning, haven’t use drag wheels yet 3.73 gears with lsd Hp at the wheels were over 360

[@yfnfresh9184]

I have a gen 3 5.3 I replaced with flat tops pistons, longtube headers,243(not ported.) heads and btr stage 3 cam and springs ,and a 102 fitech intake and stand alone system. Th350 trans and .its my first build any guess on the hp I'm looking at?thanks for anyone's help

[@richardholdener1727]

what stage 3 cam?

[@yfnfresh9184]

@@richardholdener1727 the Brian tooley stage 3 truck cam 553/553 lift

[@nep639]

Looking to rebuild my lq9. V6 right now on my single cab, I have a built 4l60e ready to go. Just collecting as much info I can, first timer and want to learn. Trying to max out a “stock motor” (heads ported, nnbs intake manifold and the throttle body). No nitrous/turbo or supercharger till later on. Doing all that work might as well throw a cam right 🤣 what heads will help with my build? 243? 799? I do want good low end and top end.

[@richardholdener1727]

use 243/799 (same heads) if you have them

[@nep639]

@@richardholdener1727 what cam is best if I was to put a lsa supercharger or nitrous. I thought about BTR just don’t know what stage.. if 2 or 3.

[@meanermater1310]

So... what would you say would be the ABSOLUTE max n/a one could pull with a l59 with 862 heads on 91 but yet be streetable

[@richardholdener1727]

MAX AND STREETABLE....DOES NOT COMPUTE

[@meanermater1310]

@Richard Holdener see issue I am having is which way to go for power. Fuel is an issue here. Few places have e85 and them who do don't seem to stay consistent test wise, however we do have 91 everywhere. Can one get away running poor man's meth injection as well to pull lil extra timing? I mean I'd like to achieve 800 crank, I'd be fine with 700. Would this be possible? I just can't fathom the cost of having barrels of e85 shipped

[@richardholdener1727]

you can make 700 flywheel hp with an ls and boost and wm

[@meanermater1310]

@@richardholdener1727 I'd be happy with that

[@jmullis78ify]

I put ls6 heads on my 6.0 lq4. I wouldn't really recommend the swap out of the factory heads. The horsepower difference really isn't worth the labor and the costs

[@ronalddrummond4580]

Hi Richard, I have a lq4 with 799 heads milled .010 and .041 head gaskets what’s my compression?

[@richardholdener1727]

SEARCH WALLACE RACING COMPRESSION CALCULATOR

[@allatonce3143]

How about testing a stock 1978 400sbc against a stock LQ4 with 317 heads !

[@richardholdener1727]

a stock 1978 400 make about 150 hp less than a stock lq4

[@allatonce3143]

How about low end torque test pure stock ? It might be hard to do this test due to the scarcity of 400sbc unless you bought my 400 for a ridiculous high price . It would be a fairly accurate test and close to stock wear wise since it has only 89 kilos on the odometer . Even an LS won't idle any better . Solid 21 hg vacuum. Its currently running in my 1978 Chevy Van 22 foot motorhome 10000lbs with supplies . I towed my Honda Accord with a tow bar up over the Cocaqualla Pass in the BC Rockies , toughest climb in Canada , almost 14000 pounds with little trouble .Yes the Turbo 475 pulled down in second a few times but really no sweat . Quite a feat for 150 HP ! Oh yeah , its in a dually with a complete fiberglass body . I also have a LQ4 out of a 2007 Savana and a 4l80 and everything to do the swap . Just hesitant to pull the trigger . Might do a lot of work only to face a huge disappointment . Could an LS have that much more torque ? You know how we always go on about cubic inches and stroke . I could be more motivated if you would buy it because its physically in the way of the 6.0 and 80. Help !

[@allatonce3143]

It was a cool moonlit night so the air charge was cold and that made the 400 stronger maybe..i dunno....

[@raymoore1870]

I have a 09 6.0 LY6 with vvt. Do you have to swap the cam out? Can I just change the cam sprocket and bolt? I’m installing this ly6 in a non vvt application. This is a budget build. Let me know thanks

[@richardholdener1727]

to remove vvt-you need to remove the cam and replace cam and timing chain

[@clintlawson2455]

Im wanting to put in 4x4 square body

[@matthewpalacio3198]

Do a video of ls383 and 243 vs 706 heads

[@SuperSilvi1990]

Seconded for the 383 my current build route for my gto. I have the 243 heads tho.

[@matthewpalacio3198]

@@SuperSilvi1990 same here and going turbo as well I wanna see what kind of numbers it put down

[@schase5193]

Hey Mr. Holdner, love your vids and the way you explain stuff. So. I have a couple of questions for you if I may please. I have a 4th gen Camaro. LS2 Aluminum Short Block , Stock Compression, West coast fully ported L98's DBL LP385 Pumps, LSXHR Manifold. I want to go twin-turbo. How much Can I realistically and reliably expect from this setup?

[@richardholdener1727]

STOCK BOTTOME END?

[@schase5193]

@@richardholdener1727 yes sir.

[@schase5193]

Well. Not completely. I will have summit h beam connecting rods and forged Pistons but the crank will remain stock.

[@swappedoutZ71]

@@schase5193 get the crank too or enjoy having a limiting factor in your otherwise stout build

[@gothicpagan.666]

If that motor had a matching pair of heads, both that good, it was probably one of those cars that just seemed to go well.

[@leonmullings2550]

What head gasket to used with the 706 862 heads on lq9

[@richardholdener1727]

fel pro for a 4.0 or bigger bore or ls9

[@TheKAR1955]

Can I get more power to my 4.8 with 862 heads with larger then stock fuel injecters

[@christopherking2012]

Arnt those the stock heads? 706/862

[@hoosierroller]

So out of these heads and the tests whats the better heads to run on a 5.3 daily?

[@richardholdener1727]

use the heads that came on the motor

[@user-ws9sp1wb6q]

I have a cammed 4.8l would recommend to use the 862 heads or 243?

[@richardholdener1727]

862

[@jeromecarter1253]

Can a ls3 head fit on a ls1 block

[@richardholdener1727]

yes on the block, no on the bore

[@jeffreyherrin8870]

My 5.3l has 243's on it. Its an LY5.

[@shadowopsairman1583]

Gen4. Gen 3 is LR4, LM7, LQ4/LQ9, this is not all inclusive

[@CobosDoesItAll]

My 4.8l ly2 has 243s.

[@seanandersen338]

@@CobosDoesItAll mine cam with 862

[@jpgasper]

What did the valve job look like on the magic 243 heads? Maybe they had been off before and someone did a nice valve job.

[@insanekiller9256]

Hey richard i have a 4.8l and i have 862 heads and im going to put a stage 2. 212/218 .600/.600 and im also going to do ls7 lifters and a stall and 3.73 gears would this be a good decent setup for daily 🤔

[@richardholdener1727]

yes

[@insanekiller9256]

@richardholdener1727 thank u🙏🙏💯just want to wake up my 4.8l a little more

[@SAS-Inspections]

I have a 5.3 Lh6 and I’ve chosen the btr stage 2 cam. What else should I look at to improve the engine

[@richardholdener1727]

long tube headers, tune, springs, tbss intake all help

[@E3DaDrumma]

Have you done a 862 review and test video…??? Thinking of getting them for my 04 6.0

[@richardholdener1727]

I have tested them vs every other stock cath port head

[@E3DaDrumma]

What’s your take on them I have a stock 04 6.0 with the 317 heads… what would be a good combo for everyday driving with some haul ass capabilities

[@andrewmontgomery1763]

I know this is unrelated, but I still would like some resolution of the trickflow head debacle for the 4.6, mainly that stock cams (and any cam designed for a PI head’s valve geometry) won’t work well in trickflow heads, and can lead to tuning difficulties and ultimately an engine not making the power it should. I’d love to see a back to back comparison of a set of L&M engines cams and a comparable Comp cams set (made for a PI head).

[@richardholdener1727]

THE TFS RUN FINE WITH STOCK AND STANDARD PI CAMS-JUST ASK THE GUY WHO DESIGNED THE HEAD (BRIAN TOOLEY)

[@andrewmontgomery1763]

@@richardholdener1727 that isn’t a strong argument though, simply relying on the creator (who is not a fully objective evaluator) saying “there’s no problem”, when my engine builder has has personally experienced issues with TFS heads and PI cams, and L&M engines (a respected company) has provided a reasonable explanation as to the lack of power and tuning issues being the result of altered valve train geometry. I know Brian Tooley is your friend, I’m simply asking for a back to back test. I deeply respect you and Brian Tooley, I just have seen reasonable evidence that there may very well be an issue that’s worth doin a relatively simple test.

[@Kamshaft93]

Do you have any experience with the Wegner NASCAR spec cnc 243s

[@richardholdener1727]

no sir

[@cstavro]

1.89" intake is plenty even for the 5.7. the extra flow on a flow bench from 2" valves won't benefit anything smaller than 5.7L. 706 heads have essentially an identical port to the 243. That's why they flow the same. the small valve is what makes the 706 heads better, not the chamber. and it's not the "discharge coefficient". it has less reversion, which is why it boosts low end torque. there's still lots of room for improvement to get rid of the chronic turbulence inside the port.

[@richardholdener1727]

NONE OF THAT IS ACCURATE-THE 706 IS NOT THE SAME PORT AS THE 799/243 (TESTED THAT). A 706 DOES NOT FLOW THE SAME AS A 799 (TESTED THAT) YOU PROBABLY MEAN THE 317 HEAD AND 799-WHICH DO FLOW THE SAME BUT HAVE DIFFERENT CHAMBER SIZES AND DESIGNS. COEFFICIENT OF DISCHARGE IS A REAL THING. A 2.0 INCH VALVE HELPS FLOW AND POWER ON A 5.3L BORE (TESTED THAT)

[@anthonyminnard1204]

Hey Richard, I have a 5.3 l59 with 862 heads with a SS2 cam. Im thinking of putting on 243 heads with flat top pistons or maybe keep the 862 heads with the flat tops. what is the go to here? what should i do?

[@richardholdener1727]

flat tops and 706 (ported with bigger valves)

[@anthonyminnard1204]

@@richardholdener1727 706 heads over 862 heads?? Just picked up another lm7 with 706 heads two days ago.

[@anthonyminnard1204]

I guess i should mention this is in a tahoe. 2800 stall. 3.73 gears for now.

[@richardholdener1727]

706 and 862 are the same heads (performance wise)

[@paulparish4965]

What is 823 LS heads in 4th gen 6.0

[@richardholdener1727]

823 is a rec port head

[@paulparish4965]

What is need to make them equal to a CNC port head

[@mohofrojo321]

I got a 99 firebird v6 project, I want to swap a 4.8 . What heads do you recommend with turbo setup?

[@richardholdener1727]

STOCK HEADS WITH SPRINGS

[@martinez1701a]

Those LR4's are always overlooked, a lot of guys usually go for the LQ9 or LS2's. They're great for making power with forced induction and you can usually find them cheap.

[@garykarenmcgruther6386]

Are you going threw all the lift ranges? Anything past the combustion chamber depth you'll see a flow increase cause bore fixture size to a point I do believe but not a big increase. Was your depression set rt?

[@richardholdener1727]

FROM .050 TO .700 USUALLY

[@Gbody_Bobbo]

When are you going show this video ? I’m a fan of 243 head. I want to see it on the big engine

[@richardholdener1727]

this is on a 5.3L-I already have vids up on the 6.0L test

[@Gbody_Bobbo]

@@richardholdener1727 I would like to see them on 4.125

[@CobosDoesItAll]

@@richardholdener1727 do you any data with the 243 heads on a 4.8? That's what mine has.

[@westcoast6162]

@@CobosDoesItAll you're looking at around 320 to the wheels and that's with a big cam

[@jamesdavid3933]

Cant i run 862 heads on my lq9 6.0. I have set of 317 at the moment do you think will make more power

[@richardholdener1727]

yes they will

[@jamesdavid3933]

@@richardholdener1727 Thanks Richard im listening to your new video rigth now about706 (862)on 6.0 Good work thanks again

[@anthonymontoya6950]

I wondering if using my PRC ported 243 heads on a 408 will be a good combo ? As of now that is what I have with e btr stage 3 cam. It’s going on a c6 ls2

[@richardholdener1727]

YES-THEY SHOULD WORK WELL

[@anthonymontoya6950]

@@richardholdener1727 thank you Richard for your tech advice I’m planning to run them for while then update with some Frankenstein Ls3 heads later on.

[@cartrellthompson4422]

Do you know about the 383 stroker motor

[@richardholdener1727]

which one

[@Saddedude]

823s are cheap and flow over 300 cfm stock. Why guys keep argue about the best cathedral port head when the best 6.0+ head is rec port is beyond me....

[@tonym6854]

For high rpm horsepower yes. But how often are you at 6800 rpms? Cathedral gives much more torque at lower rpms and better for street performance. Velocity at lower lift is key

[@Saddedude]

@@tonym6854 They made more power everywhere iirc.

[@tonym6854]

Not according to this test 20 lb/ft more lower in rpms kzbin.info/www/bejne/d5aZXmSmrNV6r6M

[@runnningonempty]

What happened to the vs vid of the hand ported 862's to the 243's?

[@richardholdener1727]

coming

[@runnningonempty]

@@richardholdener1727 yeay..I port 2 sets a month,I have 2 pairs next to me now.

[@josephedwards1632]

Is there a good option from the aftermarket for a small bore engine like an LS1? 243’s are getting harder and harder to find, coupled with the amount for port and polish work I think price is comparable. Got a freshly cleaned and checked out LS1 with a polished crank for doing some brush work. Want to put it in my S10 for a fun 450ish hp street driver unless their is a budget friendly stock head that will get the job done on pump gas.

[@deewyte5081]

Wilkes

[@boatsandjeeps780]

My 5.3 is 2012 all aluminum with 243 heads , how do know what motor thus is (lm7 etc etc)

[@richardholdener1727]

l33 or lc9 possibly

[@clintlawson2455]

Wish the 4.8 and 5.3 could be bored more

[@christopherking2012]

.118 over