can the LS CONQUER? or is the 8.1 KING? $3,000 shootout is DONE (and I'm kinda disappointed)

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After about a month and a half of working on the 4.8 versus 8.1 build-off the wrenching is done, the tuning is dialed in, and it's time to measure the results of our labor and see once and for all, is the 8.1 liter Gen VII Big Block still king of the hill, or can the mighty mouse 4.8 liter Gen III small block LS LR4 take the crown? With the same $3,000 budget for each, I set out to determine if a modified LS is the best choice for a performance truck, or perhaps a bone stock 8.1 big block might be better all around... This test is made up of 0-60 acceleration times, chassis dyno numbers for HP and torque, as well as some runs to the 1/8 mile.
Check out TolmanPerformance.com for merch and to support the channel
Draggy GPS Performance Meter, accurate 0-60 + 1/8 & 1/4 mile time
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Complete 4.8 Build List
1 3/4 long tube headers with custom X into Y 3 into 4 inch exhaust
220/224 @ 0.050" cam 112+4 0.575" lift
Comp 918 beehive valve springs
Summit LS7 Lifters + Trays
Summit Oil Pump
Mahle MLS Head Gaskets
ARP Head Bolts
BTR Roller Trunnion Upgrade
8.1 truck injectors
Summit Pro LS Torque Converter 3,000-3,200 stall
Airaid modular intake tube
AEM Wideband Gauge
All new gaskets
Tuning by Skye Performance in Smyrna, TN
Chapters
0:00 Is the LS still Best?
2:42 Dyno Testing
4:20 Disappointed with the results?
10:29 Airbox Mods
13:14 Did the holes work
18:03 0-60 Testing and 1/8 Mile
21:03 Declaring a Winner
#lsswap #gmt800 #racetruck

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20 июн 2024

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Комментарии : 605

@LawrenceTolman 2 года назад

OK, lots of great guesses with our contest the other day, but we had four people with guesses within 0.3 HP of the actual measured at the wheels, so that means four T-shirts will be going out. I'll be putting the names and official announcement in next thursdays video, but thanks to all that entered!

@gearbanginentertainment7476 2 года назад

well now that this series is done, there is no point to your channel. it holds no more entertainment value. peace!

@BrockGrimes 2 года назад

My 88 reg cab short bed.....I'm dropping the 502 4l80e package deal in it. Big Block all the Way!

@Prestiged_peck 2 года назад

LSA WITH a turbo, if you're going for the supercharger only approach though go for a twin screw (e.g. KB/whipple)

@2S1L3NT 2 года назад

Hi Lawrence, where did you source the 8.1?? (I'm in Riverton)

@Prestiged_peck 2 года назад

@@2S1L3NT they can be had from suburban 3500s, many 2500+silverados, the avalanche 2500/3500, and most gmc equvalents

@christianmeeks4430 2 года назад

I really think that if you do some home porting on the heads and upgrade to a trailblazer SS intake you'll gain quite a bit with the upgraded cam. Also, as far as power adders, a twin screw supercharger is going to be better than a roots supercharger if you go that route.

@ponypwr 2 года назад

Port the heads, twin screw it!

@kristianmichels5649 2 года назад

Tbss Intake would see good gains porting the heads would see a tiny gain for the time and money spent. Those heads stock can support more power then most 4.8s can make

@dalethomas9307 2 года назад

Man the difference between a LR4 4.8 and a LQ9 6.0 is really eye opening. My LQ4 made 409whp with a set of speed engineering long tubes and dual 3”, a 218/224 cam and a TBSS intake finished with 90mm throttle body. I am at sea level with great air so that does help.

@shadowopsairman1583 2 года назад

Considering the LR4 and LM7 share the same bore, different stroke, and the LM7 and LQ4/9, share the same stroke but the LQ4/9 is larger bore. 293, 325, 364CID 7.4 is 454, 8.1 is 496CID

@TheMotorman80 2 года назад

Yeah I’m surprised too! My 5.7 LS1 with a TSP 233/239 cam, headers and a homemade CAI made 382whp.

@xpeacemaster 2 года назад

@@TheMotorman80 why wouldn't you just get an slp intake?

@TheMotorman80 2 года назад

@@xpeacemaster Because it’s an LS1 in a 1995 S10. SLP doesn’t exactly make an intake for that, plus it’s way cooler to fab up your own stuff!

@sethh8892 2 года назад

@@shadowopsairman1583 not sure what any of this has to do with his comment...

@APM67MustangFastback 2 года назад

They both have their place. My choice was easy. I bought a Volvo 240 to shove a 6.0 in to it. My truck already had a 6.0, so instead of buying another 6.0, I bought an 8.1 for the truck. Two projects with one engine 😁

@demarcusbody9437 2 года назад

Destroy that Volvo asap

@moparmanjames 2 года назад

Well, you just stomped the LS with the boat anchor in every category including dollar per hp, then concluded that the LS is better. Lets just agree that given the same modifications, the larger displacement engine usually out performs the smaller.

@91CTD 2 года назад

the problem is, you have to locate & buy the 8.1 engine to swap in which usually aren't cheap. Standard cab 4.8 and 5.3 trucks are dime-a-dozen as long as you'll settle for a high mileage used one.

@sethh8892 2 года назад

@@91CTD and? That doesn't disprove what the original post states.

@67Chevelle396SS 2 года назад

Magnusson is my vote. You already made the exhaust and have a turbo setup. Will really wake up the bottom end and make it feel more like that big block you love ( I do too super stoked for the stroker build!)

@davemcdaniel4856 2 года назад

You are supposed to open the fender holes up. They are 75% shrouded compared to the airbox inlets. Die grinder and a few minutes work opens it up to match the airbox tubes. Just like a gasket match.

@Mr688895 2 года назад

Neat comparison. Thank you for all the hard work.

@abnpthfdr2934 2 года назад

This has been an awesome quest. You are a very talented do-it-all, a jack of all trades. Wish you (and your trucks) the best in the coming future and will be watching the additional improments that you will have for them.

@LawrenceTolman 2 года назад

Thanks!

@lincoln61 2 года назад

How does the fuel economy of the 4.8 and 8.1 compare at 75mph? For those of us that rack up highways miles.

@davemcdaniel4856 2 года назад

My 8.1 Suburban gets 10 to 11mpg at 80mph with 33x12.50, 4l80e trans, and 4.10s. 7.5mpg in town. Cool thing is my mileage doesn't change unless I'm towing 8k+, or have a large cross section trailer for wind to grab. I can be solo, or at max passengers and payload with a trailer and it doesn't change. I'm also in Utah. I'm cammed, roller rockers, e fans, long tubes, dual 3" exhaust with x pipe, Volant ram air, 4l80 mods, and tuned. When stock i got 12mpg freeway, 9 in town.

@derekmaxwell8164 2 года назад

@@davemcdaniel4856 bigger engines are affected less by towing ford even said they used the new 7.3 gas engine to save fuel.

@shoveitkarengunsandammotes4670 Год назад

My little 4.8 gets 19 per the gallon on highway my older 99 suburban 8.1 got like 9mpgs

@blautens 2 года назад

For me, I love the LS2 in my TBSS and it makes for low effort power - I'm in my 50's, I'm done with blowing stuff up. Mild tunes and bolt ons, long tube headers, extensive aftermarket support, easy to tune and diag with HP Tuners, and no DOD makes this particular LS2 my sweet spot - I'd drop it in anything. But hey, NA vs NA, big displacement will win the numbers game. But I'm so dialed into the LS platform, and I'm just done spending time working on stuff rather than simply driving it - so the easy way out for me is anything LS. Great video - I love your methods and hard work and conclusions, they're nuanced and comprehensive. Thanks!

@Synthfidel 2 года назад

Following you closely, and trying to keep up financially! Caltracs are on my list for the 81 stepside, but not the 99 AWD. The 6.0 / 6l90 combo is in the 81, and yes I know you said dump that trans, but I think with some higher line pressures and a few other things, it may survive. I did keep the extra 80e, just in case. Stay tuned my friend, and I definitely will too!

@olblue81 2 года назад

Great content LT. I enjoyed that you stuck to your process and modded the 4.8 even if swapping in a 5.3 or 6.0 seems to make more sense.

@vhp454 2 года назад

Kids kids kids, i own many big block chevys. I also own a truck with a ls 6.0. First i own a stock 396 L89 big block. Only added headers. This engine is NA with a carb. It put out on the wheels 416hp and 496 tq. Now i own a 1971 Baldwin Motion camaro, i have owned this camaro since 1982. It gas a 454 LS7 from 1971 installed by motion. Only added a 3.5 dual exhaust and hooker headers and it is carburetor. At the wheels it has 577hp and 608tq NA. I will keep my big blocks!!!!!

@mcfero1 2 года назад

Similar times on the 4.8 as my 72 el Camino here at 1200 ft elevation. I’ve got a gen 3 5.3 with a tbss intake and 90mm throttle body, 4l80 and 2.73 gears. Best times on my draggy 0-60 8.03, 1/8th mile 10.45 @71. In the process of change to a 9 inch and 3.70 gears. Turbo soon. Love the content.

@teaguegearhart9851 2 года назад

LT mic drop. What a grand conclusion a really fun series. Great work LT.

@Verticalpedalgarage 2 года назад

Awesome video as usual LT. Merry Christmas!

@chuckspeed8880 2 года назад

My old truck. 2004 Silverado 2500 hd, I had a 2-1 magnaflow with the 4” tailpipe, afe cold air intake, on my buddy dyno, it made 278hp/340 torque roughly, glad you bought the 4” tailpipe from magnaflow, that little 4.8 that could can’t wait to see you do more with it

@HeadFlowInc 2 года назад

Have you not done the basic performance changes to the Power Enrichment? You don’t need any Delay and PE needs to be set at 40-50% throttle. Also do a TPS reset to make sure it’s scaling properly. JD

@Dr.Westside 2 года назад

PE should be set throughout the range and should ramp in around the same time as the power band for the cam that you're using . You definitely don't want it running 50 mmHg and ramping in at 2000 rpm so every time you look at the gas pedal you're in PE . That's a fantastic way to waste fuel and ruin power . You really should have a delay unless you want your computer pulling fuel everywhere you go unless you plan on driving with your foot to the floor all the time . Just taking off from a stoplight you pull 75 mmHg . And in my case that's with a 232/241 cam that robs a s*** ton of vacuum . Stop raping your PE and properly set your VE .

@kevinboer4848 2 года назад

I've enjoyed following your builds. The stepside reminds me of my buddies truck. He put a Magnusson TVS1900 on a 4.8 and it made good low end torque.

@Stinky_G04t 2 года назад

I did this but on a L9H 6.2 i love the trucks it’s amazing also full bolt ons.

@Shimmy_J 2 года назад

Absolutely LOVE the way the 4.8 sounds!

@SavageNasty253 2 года назад

Thank you for using your 4.8. everyone picks the low hanging fruit and gets the 5.3 or 6.0. not everyone has the space and time to swap out the 4.8 to 5.3/6.0. Imma do this with my two Silverados but they'll both stay 4.8. then boost. Thank you again! I fell in love with the 4.8 and I can't seem to get away from it...

@crautoguy8384 2 года назад

I agree might not be the big horsepower monster but that Little motor Winding up Sounds so good yes you could make more power With bigger one But I love the underdog It's the C biscuit

@curvs4me 2 года назад

You can just make a pull without the air filter to really narrow it down. Then you'll know if it's mostly filter or intake piping. You can keep going with timing until you don't make any gains and adjust knock sensors accordingly on the same day with the same fuel. You won't hurt an NA engine that way, the knock sensors will pull timing.

@crautoguy8384 2 года назад

Problem is if that's a oiled KNM air filter it dirtied up the maf

@curvs4me 2 года назад

@@crautoguy8384 If it wasn't dryed for 12 hours maybe. Or if it isn't K and N filter oil. It dries completely overnight.

@tommy-leerice8143 2 года назад

Great video love all the information you put out there keep up the good work 👍👍

@petersimpson1734 2 года назад

I really enjoy the BBC vs LS comparison, Turbo's are my favorite form of forced induction but will be gladly following along regardless of which way you go. I would be curious to see you make a 0-60 run without the air filter and that would tell you if the restriction is the air box, filter, or both.

@sogood4u489 2 года назад

Thank you for the great content and look forward to another year of it. Merry christmas LT. Claiming that hill to one mill!

@chrisseymour2029 2 года назад

I enjoyed the video. I especially appreciate the methodical approach to tuning and the practical suggestions on measuring performance improvements without a dyno session. I found it really helpful. The air box hack is a great example of quick low cost way to test a hypothesis and then using the data logger to infer the improvement. Very clever, thanks.

@LawrenceTolman 2 года назад

Glad you enjoyed it!

@LawrenceTolman 2 года назад

Glad you enjoyed it!

@bigblockford3059 2 года назад

Wow that LS made the same power a stock Ford 4.6 3valve makes. the 4.8 is gettin there. I’m super excited for the big block stroker. Can’t wait to see that torque monster eat!!

@pv2smurf 2 года назад

Stoked to watch!!

@adamthatguy4655 2 года назад

This has been a fun comparison to watch. You should call it "the little engine that could". Keep up the great content! Merry Christmas!

@TheycallmeRpCratchet 2 года назад

Bro I love the note of that exhaust you built sounds awesome. I have done similar things experimenting but that thing sounds great.

@paulseguin1061 2 года назад

Hey LT! You are always putting out great content! Thank you! I’m in the process of swapping my 94’ K1500 and was wondering about the dual 3” to single 4” exhaust and how it would sound. Then how convenient for me you are doing the same exact set up I’ve been building in my head! Haha. Looking forward to the completed system with tail pipe! Thanks again, Keep up the good work!

@jakewade7388 2 года назад

Very good video LT. I was a little optimistic on my 320 HP guess. I hope you plan on putting a roots style blower on it. I really want to put one on mine but, they are $$$$$$$

@patkrause1254 2 года назад

Keep up the good work LT. MERRY CHRISTMAS

@watajob 2 года назад

Context matters. Emphasis on race over street? LS, hands down. Everyday driver, (towing, hauling, longevity, low strung), big block all the way. The 496 w/a mild cam, exhaust work, intake help would have probably yielded ~400 HP and well north of 500 ft/lb. Perfect to pull the trailer, load it up at Home Depot, then blow the tires off at the track.

@tomthomas9910 2 года назад

Great comparison surprised even with fuel injection at the 4.8 still isn't making one horsepower per cubic inch especially the 8.1 stock boat anchor had one in a 2500 heavy duty with a factory 410 and an Allison 6 speed it seemed way down on power plenty of torque but yes a supercharger or turbo would have definitely been fun and pept that motor up seems as though it's been replaced by the 6.0 that over the years has become more efficient and definitely better gas mileage

@joshuathacker7479 2 года назад

I’m leaning towards your restrictions being TB, even with a 4” intake tube, that’s still the deadhead point of stacking air and just bottle necking it right there, but my guess is also if you stepped up to a bigger TB you’re going to lose some on the bottom end. But I agree with most everybody, it’ll respond best with some boost or nitrous and the bigger TB

@jordanv5400 2 года назад

absolutely awesome comparison and well done videos, loved every minute of them!!! would love to see how much you spent on the 8.1 to turbo it and use the same budget to turbo/s.c the 4.8 and then compare the numbers again! I love the David vs Goliath theme so I say build out the 4.8 before you swap it out.

@LawrenceTolman 2 года назад

Hey made a video about a year ago showing the cost to turbo the 8.1, but that was my plan to try to continue the budget comparison in stages

@jordanv5400 2 года назад

@@LawrenceTolman I'll definitely check it out! yea I think it'd be awesome to see what the $$/hp is once they both have forced induction and same money spent as well as which one is quicker on the strip/draggy 👍👍

@raymondjohnson8522 2 года назад

yes that would be awsom

@jamesnewman3198 2 года назад

Put the 8.1 in the stepside then you would have something when awd happens , love my 8.1 over my 5.3,6.0 , nice video thanks

@ValarAmstaffs 2 года назад

Love it! Great series LT!!

@assaultlick2169 2 года назад

I'd love to see a procharger on the step side. A roots or screw blower would really help the low end torque but I feel a procharger would really play into the 4.8s short stroke and need to rev out. Either way, excited to see where this goes

@shadowopsairman1583 2 года назад

Twin screw it.

@rotaxtwin 2 года назад

Would love to see a roots supercharger on that 4.8. I don't know if they're popular as turbocharging is so common, but I just love the sound of that little LS revving out. The 4.30s would be right at home, no doubt.

@andy347495 2 года назад

Did you say you didn't include all the gaskets etc... for the 4.8? Wouldn't that add a lot to the price list of the 4.8 and give a better comparison of cost?

@erscustoms911 2 года назад

Good comparison lt Do you think this intake box would give me around 5 hp on a stock 97 vortec?

@garyangle3306 2 года назад

Love what your doing, let em breathe, let em eat. Nice video. Thanks

@Manoznegraz01 2 года назад

I have a 98 single cab stepside with a 8.1 and allison 1000 transmission , its flawless and love it. in my opinion the 8.1 is under rated . i would like to see more aftermarket performance parts out there.

@johnprince7510 2 года назад

In my experience the small spikes you see on the wideband under full throttle are misfires. Not complete misfire, but small misfire. That could be part of your missing power.

@bwag4007 2 года назад

Nice data analyzing! Next need to figure the weight of the vehicle into the matrix... Great stuff!! More Power Tim (err LT) the toolman taylor, grunt grunt!

@rayrussell6064 2 года назад

I'm a big block fan always was and always will be but ls has its place 100 percent great test results especially with a 4.8 not a fan off the bigger ones are way better but lately I have seen a few more 4.8 videos and I'm getting a little more impressed good luck and as always be safe 👍 😊

@leoalmond4967 2 года назад

I did similar upgrades on my 07 Tahoe a couple of years ago. Custom Cam new springs full rebuild full headers intake etc. spent $3500 at the engine shop. Dino in SC shows 320 hp 321tq at the wheels. I did have a full day with a reputable tuner. 5.3 and a generation newer. Still get 18mpg. Wife drives it everyday now. Most likely an elevation issue for you. The 4.8 supposed to have thicker cylinder walls which makes it better for boosted applications. Love the challenge. Smart move

@lparsons6977 2 года назад

Love this info thanks!

@charlesschneider7079 2 года назад

I really enjoy watching your build vids even back to your days on Trucks. I personally would keep the LMG 5.3 in my Silverado with a few upgrades. I have the speeding ticket to prove that it will get you in trouble in a hurry.

@charlesschneider7079 2 года назад

BTW, your friend, Pat from Engine Power, did a junkyard 5.3 build that put down decent power on his dyno.

@gregrohrs404 2 года назад

This comparison of data and thoughts/conclusions is really cool. But I’m honestly only here for one reason…what will he name the little 4.8?!? Lol. Only kidding about being here for one reason. These videos are great, LT! Your knowledge and research is top notch. Keep up the good work!!

@qxr20 2 года назад

nice work it sounds good, Lsa would make the 4.8 a blast... i have 2 gt30s on one and it needed a tiny bump of n02 to light off the turbos. but that was with the stock converter...

@jerryr1663 2 года назад

Great video! I’m still adamant LSA!!!!!!! Please !!! for the 4.8!

@sidswift4709 2 года назад

LT IF You can fid a 08 model LY6 6 liter add an Elgin sloppy stage 2 cam and find a good used 6 speed trans you will be AMAZED with the end result Regards Sid Nice projects and thanks for sharing with us

@prnd21turbo 2 года назад

Great video .

@AustinCoulson 2 года назад

I know it's not the point of these builds, but I am curious what the fuel mileage is on the 4.8 NA vs the 8.1 NA?

@thelaw300 2 года назад

Thanks for the fun comparison LT! I’ve owned a 8.1/Allison 2500HD; all said I would rather have an LS in a truck in most 1/2 ton scenarios for the same reasons you mentioned. Especially an aluminum block, just so much lighter, much much bigger aftermarket support, higher rpm = more smiles for me. Conversely, the 8.1 makes more sense where weight is a good thing or you’re running 38”+ tires offroad.

@davekulman8195 2 года назад

The stock 8.1 setup would be great for towing and you said it Best there is no replacement for displacement but the little 4.8 did great considering the displacement and you're turning the 4wd components I think it was a very good comparison because each trucks setup they'll have their place like ugly truck trailering the step side to the track

@brandonallison2617 2 года назад

They both need heads and an intake manifold, but as the 4.8 sits, if you dumped 29.4 psi of boost in it you are looking at ~556 rwhp/~667 crank, if it can move the air and fuel.

@albertgibbs2937 2 года назад

Looks like Saratoga Springs, I'll keep my eye out next time I'm over visiting the Brother and Sister inlaw. Any plans to come to Boise and run your trucks at Firebird? Hoping to have my Turbo 99' Silverado at the track next summer. And I agree 100% there is no replacement for displacement...

@PappyDan 2 года назад

on the stock air box, the upper air intake can be removed, you can also remove the holding ring from the MAF and remove the screen.

@ropac1256 2 года назад

To get the most performance? Big Block!!!! To enjoy it and drive it too.... LS. Stoked to see this awd conversion

@gapnationgarage71 2 года назад

You should hands down do the whipple 2.9l if you are thinking about a roots style, because it has the front inlet, and cost the same as the smaller 2.3l….. then if you go up in engine size aka 6.0 or 6.2 you won’t have to get a different blower!🙌🏼🔥

@EGGINFOOLS 2 года назад

Nice that the 8.1 makes those numbers on 87 octane gas. Doesn't need premium. Also with the numbers the 4.8 is making I don't think the 3 inch tube is a restriction at all. A 3 inch exhaust would be ok at those numbers so the intake would be too. Maybe pull the filter out of the box and run it a few times and read the kpa

@LawrenceTolman 2 года назад

those are other good factors that I didn't consider, but they do make it appealing for the big block.

@xozindustries7451 2 года назад

You really need a supercharger at that elevation, it’s science 😂

@charlesbaranski1860 2 года назад

Still cool. I’m building a 5.3 to a 5.7 so basically a iron block LS1, with a BTR Truck Norris cam and a TBSS intake.

@ericvortecmax 2 года назад

I’m really interested in that cam

@evloftis4143 2 года назад

i have a 5.3 in my 2001 silverado 4x4 and it puts 450 to rear wheels. like the 4.8 build so what you goin to do to it now ?

@Thedriver96207 2 года назад

Wow I was wicked close with my guess! I figured that would be about right, they aren’t the best NA.

@crankygunreviews Месяц назад

truck sure sounds awesome. I had a 4.8L sierra and it was a great reliable truck, and never had issues.

@edjackson4389 2 года назад

Im not even into Chevy stuff that much (more into Jeeps and Broncos), but I still enjoy seein the results of your work. I am entertained sir. Keep it up, and thanks

@LawrenceTolman 2 года назад

Appreciated!

@xtnuser5338 2 года назад

First time to this channel, and I'm super impressed with your organized presentation. Thoughts though: I've always though it was odd that people try to make their old trucks go faster. Keep the old truck stock for when you need to haul stuff...and get an old Camaro or whatever to put the money into for performance. Would this not be a smarter path?

@briceauger9072 2 года назад

On that filter box modification just wanted to mention it’s very common for bmw guys to do a “charcoal filter” delete. Idk if Chevy did this where they put an activated charcoal filter after the regular air filter, but if they did and you remove that you might be able to rid some of that restriction and maybe gain some throttle response. Did it on my e92 and I makes enough difference to notice

@jimmyandtommy1 2 года назад

Could be a silly idea, but would the different cam possibly have a negative effect on resonant freqs in the intake system as a whole?

@stellingbanjodude 2 года назад

I’m in the final stages of wrapping up my gen v LT swap on my 99 sierra. Just got it back from the dynoshop it put down 497 at the tires. Was it easy? Mechanically yes, electronically NO. I started the swap a week before the Covid lock down and it has taken this long to sort everything out.

@mhotrodscooter 2 года назад

i had 04 chevy 1500 with a 6.0 cam,milled 243,nnbs intake,90mm tb,lt's,80e,4.30 gears, made 417hp/414tq @ the wheels. my mud truck has 8.1/allison combo and there is no comparison when it comes to torque.. now the 8.1 is cam,d intake mod,lt's, 90mm tb,roller rocker its a beast now.

@joeyjojojr.shabadoo915 2 года назад

If you are planning to beef up the 4.8L, at least all aftermarket forged crankshafts are roughly the same price, either 3.622" or even 4.00". That little iron block with a 4" stroke will become a monster @ either 363CID at stock bore or even up to 383CID if you want to stretch the cylinders out a bit to LS1 bore size.

@colinallan2976 2 года назад

Good stuff LT!

@erichildreth7562 2 года назад

The 4.8 sounds great and I thought that the HP numbers would be higher but I forgot that you are at a higher altitude, how about doing some porting on the heads and maybe having the heads milled a little bit for higher compression and/or swapping out the pistons for a higher dome piston instead of milling the heads? Just a thought. On that airbox where you drilled the holes, take it out and cut it so that the bottom half is more shaped like a "cage" so the airbox is almost totally unrestricted. Just my 2 cents. Thanks for the great videos and looking forward to seeing more!! Hope you and your family have a Merry Christmas!! :)

@christopherhuber2517 2 года назад

Nice job

@Bynx_McFyden 2 года назад

the magnuson!! love the Zip of a twin screw, and theres no apool time! dwf get that down low toraque. and thats what kills me, the LS is popular cuz everyone uses it. if the 8.1 had the same support, it would be no contest.

@MongoMotors352 2 года назад

I think the little 4.8 is the perfect LS if it’s in a lighter truck. I want one to swap in my 99 S10 Extreme.

@chrishansen7004 2 года назад

dream swap man id love an s10 extreme. send it! would be nasty as hell

@Levibetz 2 года назад

If you're swapping, you may as well go with the biggest LS you can afford. No LS is RPM limited, so big rpm just means bigger power with a bigger LS. Unless you intentionally want to keep it mild.

@MongoMotors352 2 года назад

@@Levibetz it’s just going to be my daily driver. The 4.8 should give me 300 ish hp and better mpg than the V6.

@colorblind1983 2 года назад

This is hands down the best thing on RU-vid. LT, I love your videos!!! P.S. The ugly truck is my favorite build. I WANT IT

@208Concepts 2 года назад

That timing revelation is interesting. Up here in the Boise area most LS' like between 24-26°

@tdsilverado7470 2 года назад

LT I love Big Blocks, What can I say. My very first car was a 67 Chevelle SS 396ci 4 speed 411 posi from the factory. Nuff said.

@ictcarguy3162 2 года назад

I suppose a ported LSA with the cathedral adapters would be okay since hood clearance is not an issue here. Still prefer the turbo for overall cost and you could rear mount since you already spent money on long tubes.

@garagemonsters9305 2 года назад

No replacement for displacement. The big motors will almost always have more power lol I s dad that people still don't get it .

@jesselee128able 2 года назад

LS reluctor wheels are known to be as much as 14 degrees off. Id either verify timing with a light or keep adding until hpt shows knock

@stlchucko 2 года назад

What gear were the pulls done in? And does the 8.1L have a 4L80 while the 4.8L have a 4L60? If the pulls were done in 2nd, it would be expected that the 4L80 would read higher than a 4L60 since it has a 1.482 2nd gear while the 4L60 has a 1.625 ratio. It won’t be enough to make up the 25-30 hp difference, but it should lessen it.

@zachredline 2 года назад

Intake runners for the filter box will increase airflow affording to the shows. Less turbulence into the intake, to the intake ports is better righr?

@bretfeeney1072 2 года назад

LT, you could do a 363 stroker low compression and run boost with the 4.8l. I have a 2000 Sierra with the 4.8l and not sure what route to go. I think the 4.30 gears maybe a little too much gear to daily drive. I daily drive my truck so I can't have that much gear. Thanks for the content LT

@10219266 Год назад

High altitude is definitely a challenge. I live in Colorado so I feel your pain.

@boston7704 2 года назад

Very hard to beat an LS for inexpensive and solid power gains. I've had three, including an LSA and they all have been home runs. 8.1 is intriguing as it incorporates a lot of LS technology, and it's a great motor.

@NXT_LVL 2 года назад

Here's the thing: LS is king for the aftermarket. BUT your 8.1 is displacement... now queue in the 572/632 crates that GM has announced this past year. 572 in the COPO and the 632 that makes 1001HP. Now that I've completely thrown a monkey wrench in it all. Loved the series.

@traekiser213 2 года назад

That exhaust sounds dope

@jamesgivens2554 2 года назад

I wound up cutting out the whole side of my stock airfilter box just where the two original holes were and it works great..

@davidpugh8772 2 года назад

holy cow Skye Performance? They did some work for me a few years ago on a project car I had great guys! it's been forever since I heard that name since moving away

@ponypwr 2 года назад

Best sounding 4.8 ive heard!

@ryanlippy3745 2 года назад

What’s the weight difference in these trucks? I’d be curious how much faster the SCSB truck would be with the “naturally aspirated” 8.1 like in the ugly truck.

@LawrenceTolman 2 года назад

i am half tempted to swap in my built 547 into the stepside lol... that would be so fun to do a 4 wheel burnout/launch