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HOW TO: LT HEAD SWAP AN LS. GEN V L83 HEAD SWAP ON A GEN 4 5.3L L33. HOW MUCH HP ARE THEY WORTH?

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CAN I RUN LT HEAD ON AN LS? WILL LT HEADS FIT ON AN LS? WILL 5.3L L83 HEAD WORK ON A 5.3L LS? HOW MUCH POWER WILL LT HEADS ADD TO AN LS? DO I NEED A CUSTOM CAM TO RUN LT HEADS ON AN LS? WHAT IS THE BEST INTAKE TO RUN ON L83 HEADS? HOW WELL DOES THE L86 INTAKE WORK ON AN L83? WHAT EXHAUST DO I RUN ON THE LT HEAD SWAP? CAN I RUN VVT ON THE LT HEAD SWAP? HOW MUCH POWER IS AN LT HEAD SWAP WORTH? CHECK OUT THIS VIDEO WERE THE GUYS FROM BRIAN TOOLEY RACING SWAPPED ON A SET OF STOCK L83 (LT-BASED) HEADS ONTO A GEN 4 5.3L LS. CHECK OUT THE POWER GAINS OFFERED BY THE LT HEADS, CUSTOM CAM AND L86 INTAKE ON THE LS. ALSO TESTED AN INTAKE UPGRADE, COMPARING THE L86 INTAKE TO THE BTR LONG RUNNER TRINITY!

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26 авг 2024

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Комментарии : 242

@corvettejohn4507 Год назад

Would like to have seen a test of the L33 with an LS cam with the same cam specs as the hybrid cam so we can see what difference is caused strictly by the heads.

@harleyheil Год назад

Agreed. It lost me when the put a cam in the 5.3 that wasn’t close to stock. If that doesn’t exist, a cam of similar specs should’ve been used with the ls heads.

@filiptrojanek5083 Год назад

This test needed to included a cam similar in size to the hybrid cam but tested with the LS heads. I would suspect that only a fraction of the power increase was due to the LT heads especially on a small 5.3L engine.

@Dane33781 Год назад

Different heads can react differently to the same cam. You can't always have an apples to apples comparison.

@filiptrojanek5083 Год назад

@@Dane33781 Certainly. Buy it would give a closer representation of what the heads alone are worth.

@Fehrway_Engines 11 месяцев назад

I would like to see the L33 tested with 706 heads, TBSS intake, & a cam with specs as close to the hybrid cam as possible.

@aaronanderson6892 Год назад

Now all it needs is BOOST!!

@AustinRBa Год назад

I'm curious how this stacks up with just buying some AFR's or other comparable aftermarket heads. Of course those will probably cost more than the LT heads from a junkyard, but having to run special hybrid cams that will limit options. And I'd imagine future availability of these cams will be...questionable. Definitely interesting to see an answer to the question that so many of us have wondered!

@richardholdener1727 Год назад

those questions are why this video exists

@BLKMGK4 Год назад

I'd think buying a full on LT motor of some vintage and going crazy with it might also be a terrific alternative.

@Turbogto_guy Год назад

So in other words you compared a stock motor to a head swap and cam swap. Pointless test. Literally pointless because you don’t know what the power increase was from just the heads. I guess this is to be expected at this point. Smh.

@stellingbanjodude 10 месяцев назад

@@Turbogto_guyyou can’t do the test you described and had you been listening you would understand that. The LT head uses a different valve layout, thus a LS cam will not work. An LT camshaft won’t work either due the the length is longer. It has to be a combination of both, an LS style cam with LT lobe layout. There is only one on the market and commercially available . You guessed it, the BTR camshaft. So no this wasn’t pointless test. The LT heads are way better than most premium ported and polished LS heads, so do some research before you look like a pontificating pretentious person.

@derekr1854 Год назад

That is some interesting stuff. Wonder what the power out put would be on a 6.0 or even a ls3 motor!

@Cageisinthebuildin 4 месяца назад

Definitely want to see this on a ls3

@TurboJohn74 Год назад

Thank you Richard for making a good Friday awesome! Great content as always

@Macburton96 8 месяцев назад

I’d like to see an LS3 with LT heads and an lt4 blower and see how it stacks up to modern LT4s

@AccuSol-ERN Год назад

I agree with top shelf aftermarket "regular" LS heads being the way to go here. You get the flow you need for big power........without the hassle of keeping track of the hodgepodge of different parts needed. In today's world the aftermarket seems to be pretty quick with offering gearheads the new power parts they desire........you just have to spend the coin. Long gone are the days of garage tinkering to fab up big horsepower parts. Unless you are racing in a class that requires ALL factory parts........I just don't see the point.

@robertwest3093 Год назад

I'm blown away by the fact that this engine made 365 hp with a tiny 193@.050 duration camshaft 👍 Another impressive thing is that 389 lb/ft of torque! That's unheard of in a little 323 cubic inch engine!

@menogusta9829 Год назад

It's with headers, tuning and no accessories. He uses an electric water pump and all. Also low coolant temp. So those numbers are inflated from true stock but still good for comparison and maybe a good idea of a bolt on engine

@carado1984 11 месяцев назад

Subtract 10% then another 10-15% for drivetrain and your back to 290 wheel.

@nintendogamer5472 10 месяцев назад

@@carado1984the percentage thing is not accurate as drivetrain loss is a fixed amount, say it robs 30hp for drive train loss it would be same loss on a 300hp engine and a 1000hp using a percentage would not be accurate as 10% on the 300hp engine would be 30 but somehow same drivetrain would somehow take 100 HP on the more powerful engine.

@scotttimpany2845 Год назад

ok ok ok.... now I gotta go look for what a 5.3 LS with cam specs similar to the hybrid cam makes for hp. I need to know what percent of increase in attributed to the heads alone!

@silentbravo Год назад

That custom cam was quite large, 33x / 34x... put a large cam like that in the stock 5.3L and it would bump up a lot in the high RPM range also.

@timothybayliss6680 Год назад

Its almost identical to ported factory castings. Earlier this year Richard published an article building a 5.3 that had Katech 706 heads, LSXR intake, 234/247 625/605 cam and 1 7/8 headers that made 509hp. Those heads were CNC ported with factory valve sizes. The Gen5 heads are probably worth 30-40hp but the CNC program from Katech costs less than the hybrid camshaft.

@richardholdener1727 Год назад

that test is next!

@MichaelJohnson-kg8bk Год назад

Great information as always Richard. Also, the video looks sharp with the green screen or whatever background you are using.

@MsJohnboy30 5 месяцев назад

I would love to see this done to the ls1 with ported heads

@Lobo-tommy10 Год назад

I can only imagine how much wrenching you actually do for these vids. Thanks!

@richardholdener1727 Год назад

very little for this video-very much for most others

@shonuffgl53 Год назад

Love your videos, Richard. Guessing someone has already mentioned it... But the l86 manifold picture you used is actually an LT2 manifold. I'm hoping you cover the fuel system on the next video.. guessing the LS3 is coming up.

@richardholdener1727 Год назад

yes, my bad on the photo-the fuel system was a simple port injection. The l86 manifold was modified to accept port injectors, the BTR intake already had them, the DI was plugged in the heads.

@genepisano716 18 часов назад

@@richardholdener1727 Do you have any pictures of the L86 intake modification and who did the changes?

@Dr_Xyzt Месяц назад

In my opinion, this isn't a true upgrade if you already have good gen 3 or Gen 4 heads. However, if you have a stock bottom end 6.0 with dished pistons, this would help you get a proper compression increase.

@myoneblackfriend3151 Месяц назад

I have a Gen 3 6.0 out of a Silverado SS. I have the L83 heads and I am saving up for the rest. Any suggestions for modding the heads?

@slickcasner4205 Год назад

Like to see a LS3 with LT1 heads!

@Ws6Ms Год назад

Lt1 heads without DI and vvt cam probably won't make any more power over the ls3 head .. but the test would be awesome to see

@richardholdener1727 Год назад

coming

@chrish8270 Месяц назад

Big bang on 6.2 Ls/ lt gen5

@realshidd3062 6 месяцев назад

Big Richard go ahead and slap a LSA blower on it and let’s see what it does for the next video please

@shawnlibby675 11 месяцев назад

Richard holder have you been hearing anything about..l 8 t..6.6.. gas... gen-6 ..I believe.... but with a little bit of work what a crazy engine.. been seeing people work that motor a little bit lately and it's doing good... as a matter of fact 1320 just posted a 91 cyclone still all wheel drive with the l8t 6.6 reassembled with ls heads... and seeing another guy working on in l8t 6.6 gas and he said it's a low compression motor but just removing the cam makes a big difference

@butch4481 Год назад

Hey Richard when you do cams on the LS motors can you let us hear the camshafts on the video to give us an idea of what they sound like much appreciated

@rustysausage69 Год назад

From a builder perspective the hassle of nickel and diming swap stuff to make a hybrid happenmakes me think it would be worth it to run a complete L83 takeout and throw in a cam/tb/intake/DoD delete/with or without DI delete. Prices are coming down significantly on LT engines from a few years ago. That said, pretty cool this can be done. Now what about LS heads on an LT?

@andrewcammer2535 Год назад

It's a neat comparison, but there's such a dramatic difference between the two combinations aside from the cylinder heads that it really doesn't tell us much about what we're most interested in, which is how much better are the heads themselves. The biggest question anyone contemplating this type of setup should be why? If the goal is to be different and unique, then maybe it's a good way to go - outside of that there are conventional ways to make that kind of power on that kind of displacement that won't require so many one-off type of parts. Neat to see it done, not real practical to repeat.

@thomashumphrey5426 9 месяцев назад

Hell a cam that size alone in the gen 4 would be very close id think

@superlyfe1498 11 дней назад

Now add an lt4 blower. Very cheap in my area

@joshramirez8349 Год назад

I love your channel. Have a great weekend Richard

@realshidd3062 6 месяцев назад

Even for a quick video, I would like to see how the LT two manifold does against the truck manifold

@richardrohr5106 4 месяца назад

Ls7 with ported lt1 heads. Only this time find a way to run both ls7 port injection with the lt4 direct injection. Duel fuel. And then do I need to say it. BOOST!!!!!

@craigchiddo2794 Год назад

I want to go the opposite route put ls heads on the lt block and plumb the high pressure injectors into the manifold

@Dirtfloorfab Год назад

Hoping to get mine out this year lc9 bottom with l83 heads and a g57 98mm turbo 👍

@barryhuddlestun3098 Год назад

This answers a lot of the decisions about what to do to 5.3. I'll have to save this video. Let it breathe and give it some room for tall stacks. Ad that Hybrid cam and people will be amazed.

@tedgay8427 Год назад

Would be interested to see how they compare to the ported LS7 heads on that 427 used in the other BTR comparison tests.

@kennethpowers8995 7 месяцев назад

Those LT heads flow great and it’s not all that hard to build a hybrid. If you can snatch up a set of the LT heads for cheap it’s a worthwhile option. Then you just need a cam and a Gen V pattern intake, which you would do a cam and intake anyway even if you went full LS so that’s not extra expense. Aside from that you just need some plugs for the DI ports in the LT heads and you’re basically good to go.

@richardholdener1727 7 месяцев назад

custom hybrid cam is much more than LS cam, you also need, rockers, pushrods and exhaust-the hybrid head swap is very expensive

@kennethpowers8995 7 месяцев назад

@@richardholdener1727 I forgot about the rockers being different. Headers I wasn’t really thinking about because you would buy a set for whatever setup you’re doing heads on anyway. (Hopefully) Without looking at the flow numbers for Lt heads vs LS heads it really seems like more of a conversation piece at the end of the day then just to say you’ve done it.

@kennethpowers8995 7 месяцев назад

BTR makes a decent cam with the swapped lobes for ~$400. I don’t think that’s too bad. Another thing I didn’t consider though is the Right head doesn’t sit flush with the block, meaning you can’t just reuse your LS accessories. That is something I was unaware of too. It seems it’s still a more budget friendly option to just put a nice set of aftermarket or even ported factory LS heads vs doing the hybrid build.

@BigCapMalp 6 месяцев назад

We want to see the lt4 super charger with The Lt head + Ls motor

@lamboferruccio 9 месяцев назад

I appreciate that BTR is testing these combinations and developing awesome parts however it is an apples to oranges test, it’s actually impossible to run a proper comparison especially since the intake manifolds are so different oh and the "L86" manifold mentioned is actually an LT2 manifold pictured. A closer test would have been using an actual L83 manifold and creating a custom cam that mimics a stock 5.3 Gen4 truck cam…just saying!

@kmack747 Год назад

Now to make it an ultimate setup add a set of port injectors and boost

@kennybiggs3944 Год назад

It would be great if you can do some more testing on that hybrid that is very interesting

@DillonAuto Год назад

Nice vacuum plug. I still have the tool in my box, although I'm not sure why.

@joefixxit Год назад

Can you do a 6.0 and 6.2 THEN popular stroker variations. 392,402,408,415, and the big boy. Stroker 427 4.125 boreX4.00 stroke 😊

@turbosigma Год назад

Yes, needs to be done.

@richardholdener1727 Год назад

LT?

@joefixxit Год назад

@richardholdener1727 the 427? I had to sleeve an iron lq4 , it was a nitrous motor for about 5 passes and I sent the rear-end and the bed of my truck ahead of the cab lmfao

@roderickvinson3425 Год назад

Also require modifications for head dowels. But available to purchase

@brianrock3949 Год назад

The fuel system was really not diacussed on this deal. BTR is a big proponant of DI, so its hard to brag about big power acheived with port injection.

@richardholdener1727 Год назад

this was port injection on the hybrid motor

@jonstapleton76 10 месяцев назад

I know the bores would line up, but do the head bolts?

@speedtweaked2540 Год назад

Need another video with the L86 intake and an LT2 intake with the 95mm C7 ZR1 TB.

@Fk8td 9 месяцев назад

475 on 5.3 with a big cam is possible. I don’t think buying all the direct injection parts are worth the squeeze and engine management and fuel system becomes far more expensive. Get a set of upgraded 5.3 heads and big cam and I’ll bet for the same price you can make the same or more without the complications. I personally build direct injection 4cylinder engines and it’s a big limiting factor for fuel and cost is very high.

@StevenAndrews Год назад

Wait? I thought an L33 was gen3 since it is a 24 tooth.

@tptrsn Год назад

I think they ARE 24x but have Gen4 rods/pistons, so kind of Gen3.5?

@shaneshane1379 11 месяцев назад

This test would have been better with a cam closer to stock specs. Maybe a torque RV kind of cam.

@bluecollarhotrods9781 Год назад

Part of me really wants to put a set of L86/LT1 heads on one of my spare Gen 3.5 six liters. I feel like it could make close to 600 flywheel without any porting or exotic parts. Not as easily achieved with cathedral port stuff.

@shadowopsairman1583 Год назад

Gen 4 heads will work, no adapters needed lolz

@bluecollarhotrods9781 Год назад

@@shadowopsairman1583 Yeah, but I'm considering a Gen 3.5/Gen 5 hybrid. I'd like a simple, no porting, etc - setup that would make about 600 flywheel. I think someone has a carb intake for the LT heads too. I'm thinking about a suitable engine for my 69 Chevelle. It needs to have a lot of power if I'm not going to put a big block in it. 600ish at the crank would be about right - light, low option car with a 4 speed and 4.10 gears. 👍

@jesselee128able Год назад

I believe it has to be the L83, LT1 valves are way to big to fit the 3.780 bore

@shadowopsairman1583 Год назад

@@bluecollarhotrods9781Custom Cam Grind needed is the wildcard

@bluecollarhotrods9781 Год назад

@@jesselee128able If I were putting them on a 5.3L - yes. But the L86/LT1 will fit the 4" bore of an LQ4/LQ9 block.

@LS1NNOVATIONS 5 месяцев назад

Lq with a lt4 blower and heads.

@BlackyBulger Год назад

Guess I’m rebuilding my Yukon Denali 6.0

@mikew6135 11 месяцев назад

Hold up! We need the numbers with the exact spec cam on the stock motor or these numbers are worthless. That's a big cam. .644 lift.and plenty of not too much duration. Less duration and a tighter LSA would be preferable

@Qeebss Год назад

I have a gen V 454 outta my G30 I’m trying to get more power and was wondering if you have any recommendations for cams, intake, carb? If anything not much out there I can find and your one of the best in depth engine guy I know.

@richardholdener1727 Год назад

endless choices for that-but the TBI and tuning will be limiting

@horsefly1020 Год назад

How about LS heads on a gen 5

@corypierce202 Год назад

That looks like a LT2 intake instead of a L86.

@richardholdener1727 Год назад

it is

@robertwest3093 Год назад

That is one BEAUTIFUL 1970 Chevelle. I had one with almost the same color.

@jackdaniels2657 9 месяцев назад

Why don't we use ls heads on an LT motor?

@johnbehneman1546 7 месяцев назад

Great video Richard. Thank you so much

@ballingonabudgetlsbuilder5930 24 дня назад

What’s the name of the Cam?

@bad406camaro Год назад

INTERESTING. i have 3 of these l83 engines sitting in the garage wondering what to do with them.

@tptrsn Год назад

WHOA! Many good options of things to do with some spare L83s! Lol

@scotttimpany2845 Год назад

I wonder if BTR would be able to make the runner sections for the "long runner Trinity" out of plastic to cut down on weight

@KD0LRG Год назад

Cool video as always but a hard pass unless I come into a lot of extra cash 🍺. I have enough trouble keeping all the gen 3 -4 stuff straight, I made a cheat sheet with all the different blocks and heads for each RPO code.

@420architecMindNDesign 9 месяцев назад

Now this is cool

@thunder57 Год назад

What did you do for a fuel system on the L86 intake considering the direct injection is deleted.

@johnvirgilwilliammccoy2332 Год назад

^ THIS! This needs to be answered.

@Ghosts_and_Cars Год назад

What if you used the direct injection for water

@claytoncarter Год назад

Agreed.

@richardholdener1727 Год назад

The L86 intake was modified to accept port injectors-DI was plugged

@kylemilligan752 Год назад

I'm a great fan of your work Mr Holdener. However, when I mentioned just this same ls/lt hybrid about a year ago on a live feed you dismissed the idea, called it pointless, and basically a waste of time. How would you like your crow served Sir?

@richardholdener1727 Год назад

I still think only handful of people will do this because it's so much more involved than a head swap-watch the next one where I compare it to a mod l33

@jasonhaley5737 Год назад

We're doing this to my 6.0 this winter.

@AbstractDreamz Год назад

So technically I should be able to swap my L96 6.0 block for a newer L8T 6.6 block in my restomod Regal. .......Or perhaps put an LSA blower on a 6.6 L8T motor and get Big boy power with Big boy torque. This logic should work if you can put LS intakes on the LT blocks, Right?

@richardholdener1727 Год назад

anything can be done

@thetruthspeaker1978 Год назад

Now this is and interesting comparison 😊

@farncoisbisson7737 Год назад

4.8 direct injected!!!!

@pitomtlify Год назад

What modifications are done too the LT heads besides plugging the injectors ports? Any machine work needed?

@scotthultin7769 Год назад

Hi RH thank you for sharing 😊

@tptrsn Год назад

Killer content as usual Richard!! Would it be safe to assume that there is another one coming where you compare the Gen5 hybrid to some other comparable Gen3 or Gen4 setup to illustrate more clearly just how big the difference is? I'm thinking ported 706es with a FAST intake get pretty close to this level of performance for similar or less money?? Or a 6L with stock rec port heads and stock LS3 manifold probably gets pretty close to this combo for less money? (both of these assume appropriate camshaft to make it work)

@bluecollarhotrods9781 Год назад

I'd be really interested in that test... I have an LQ9 going together with PRC Stage 2.5 706/862s, a decent sized cam, FAST LSXRT 102mm, and all the supporting mods. I don't think it will be good for much more than 530ish flywheel. A friend has a 6L with L92 heads, Comp 469 cam, etc. It did 422 RWHP. So, most likely it's in the same range. With porting, flycutting, and more cam it might crack 575-580 on his set up. All bench racing until it hits the dyno cell.

@richardholdener1727 Год назад

yes-coming next

@tptrsn Год назад

@@richardholdener1727 Excellent!

@anythingfast4U Год назад

Speaking of the 6.0L, can this head swap be done on the lQ4? Thanks

@bluecollarhotrods9781 Год назад

@@anythingfast4U the LT1 and L86 (6.2L) heads will fit an LQ4.

@mulletracing8787 Год назад

What about l86 heads on a ls2? Wanting to swap my c6 heads for a crazy na set up

@RageAgaisnt96 Год назад

Boost! I love this combination idea

@randy6350 Год назад

Wow that’s a lot of lift for a 5.3L. And does it bolt on directly⁉

@raymondkaczmarek5631 Год назад

How can you run a stock gen 5 intake on a gen 4 block? I see di rails and valley cover but are they on a gen 4 block or did they modify the gen 5 stuff to take port fuel injection?

@claytoncarter Год назад

I agree. I doesn’t make sense, but disregard the pictures, they appear to be filler pictures that aren’t accurate. BTR intake is “hybrid” meaning bolts to gen 5 heads but is built for port injection. However, to add to your question, how do you run a plastic gen 5 intake with port injection? It’s not like you can weld injector bosses on it.

@richardholdener1727 Год назад

the DI was plugged, and the BTR intake had provisions for port injection, the l86 intake had likewise been modified to accept injectors

@bluegizmo1983 5 месяцев назад

What about the OG original LT heads, as in the LT1 heads from the 1994-1996 LT1 5.7L? 😂

@richardholdener1727 5 месяцев назад

what about them?

@shaungiles5986 10 месяцев назад

HEY RICH, DID YOU HAVE TO MAKE A VACUM LINE BEHING THE L86 INTAKE? AND DID THE HEADS NEED ANY EXTRA WORK BEFORE MOUNTING?

@Alexwaltman850 Год назад

You said the L33 is a gen 4 but I'm certain it's a gen 3. I work at a GM dealership and I know I have an L33 but I also know I have the 24x crank reluctor that came on the gen 3 motor

@richardholdener1727 Год назад

its actually a 3.5

@shaungiles5986 10 месяцев назад

HEY RICH, CAN YOU DO THIS COMBO ON A 6.0? 🧐🤔

@WildEngineering Год назад

I feel like your intro is speaking directly to me lmfao

@anthonyanderson1479 Год назад

I wanna see this compared to a similar cam in a l83. why use a gen 3 or 4 short block over the lt?

@stangman962 Год назад

What about lt heads with LS7 intake by adaptor plates?

@rustygee4919 Год назад

What injector setup did you use with the gen v heads and intake on the gen 3 block?

@richardholdener1727 Год назад

both the BTR and L86 had provisions for port injection-the DI was plugged

@hectorvillarreal3676 Год назад

@@richardholdener1727the stock l86 has provisions for port injection? Thank you for all you do for us!!!

@joshuajohnson3500 Год назад

Im ready to see Lt heads on ls with a 2650 supercharger so i can put that in my vette

@bdugle1 Год назад

Where’s the comparison to the L33 with a 459 or 469 cam? The 799 heads won’t keep up but how close IS it? A complete comparison probably needs to include another round with cam and milled 799s to make the CR close to even. I seem to recall the 500+ hp 5.3 needed aftermarket heads, and the L83 heads have to be available cheaper than that, and cams should be similar in cost. So what do you get for the cost of L83 heads and L86 intake in a “fair” fight?

@richardholdener1727 Год назад

watch the next video

@mky8353 Год назад

Boost that combo 👀

@johnbehneman1546 7 месяцев назад

A Totally Awesome Build

@button-puncher Год назад

Almost 100HP per liter. Nice.

@pdperformance1 Год назад

So 75hp from a nice cam and 25hp from the heads?

@6oblintv Год назад

This tells me an LS3 hybrid with hi ram or trinity would make 700 easy

@Skubasteph Год назад

It’s cool but not worth it at all when there are so many good aftermarket ls heads.

@johnnyparker2410 Год назад

What are we looking at for PTV

@joeyjojojr.shabadoo915 Год назад

The 'L86' intake you keep showing in the video is an LT2 intake......

@richardholdener1727 Год назад

I know-my bad-they also tested the lS2

@russelljackson7034 Год назад

Right on

@winterlounge 8 месяцев назад

I would actually like to do the opposite. Do away with the direct injection heads and run LS heads. No high pressure fuel pump to leak into you oil and valves stay clean feom injector spraying them with fuel.