First Dyno Numbers With Heads and Cam Silverado

Follow Me @austin04_z71
Modifications-
Texas Speed Stage 3 Cam
PRC Stage 2.5 heads
Speed Engineering Headers
Cold Air Intake
Dual Exhaust With an X-pipe
MSD Ignition Coils
Mild Trans Build, Coverter, Corvette /servo, wider bands, more clutch plates, valve bodies.
Stock 3.73 Gears
Turck Modifications
4" Rough Country Lift
22x12 Fuel Forged FF19
35x12.50 Toyo Open Country RT

[@dennismillus4581]

We appreciate your honesty..

[@zachgrant5333]

I've got an 08 with a btr stage 4 cam long tubes cold air and no cats with 799 stock heads.truck made 340hp and 340tq to the wheels on the Dyno and the newer motors make a bit more power due to slightly better flowing heads so i I think it's a realistic number what you made man

[@M14GUY762]

For perspective a 450 hp 510 tq raptor gets 350 whp on 35s. You are actually getting really solid gains.

[@timh1187]

Sounds right to me. I was laughing in the last video thinking people were super generous on the hp guesses.

[@Neel-xe1po]

did someone sell you some awesome heads that aren't as awesome as they claimed ?

[@thedirtdigger5990]

I've got a 2011 4X4 5.3 and did a Texas stage 3vvt cam, long tube headers, dod delete, cold air intake, custom exhaust and a tune on 87 octane I got 344 hp at the rear wheels. Oh I also did a little work to the heads. Hang in there you'll get it figured out, make sure to let us know when you do

[@deewyte5081]

Get off 87. Go 91

[@thedirtdigger5990]

@@deewyte5081 its my daily and i didnt wanna spend higher gas prices until I do more mods

[@nsprayandpraynick]

@@thedirtdigger5990 I run a heads, cam 5.3 in my ext cab on 93 everyday and get 20+ miles to the gallon and Probly another 25 hp AT THE LEAST. Also run a flex fuel sensor so I can swap e85. Y’all are leaving power on the table running 87 fuel is a big deal

[@thedirtdigger5990]

@@nsprayandpraynick after getting a new tune on 87 im at 375 rw, maybe I'll swap over to 93 and try it for a bit

[@MrBigdaddy1021]

You could have lost compression when you swapped heads.

[@rednready182]

I feel for you dude. Ive been in your shoes. My 2011 ls3 vette dynod 419 rwhp 412 rwtq with an automatic, kooks long tube, hi flo cats, x pipe and cai. I swapped heads for “prc” , vengeance racing “kaotik” cam. Yank 3200 SS torque converter. Re tuned on same dyno, same shop . Made 495 rwhp and a measly 428 rw torque. Torque is what moves any vehicle from a dig. My car was quicker. But I gave up alot of drive ability. Spent 5k on all the swapping. And was so dissapointed. I ended up supercharging it and swapping the cam for a street friendly forced induction cam. On 7 psi. Car dynoed 688 rwhp and 556 rwtq. I learned its better to boost any vehicle for bang for buck. I wouldve spent 7 k only 2 k more to have boosted it from the beginning.

[@Z71_Kevin]

I’d check with the compression test first, and see what happens from there. Who knows, maybe that Trailblazer SS intake you got may need to be put on with the new injectors. Good luck, cheers! 🍻

[@stevenalley2368]

Have the valves checked at a machine shop. Just cause their new and expensive don't mean there good out the box. Also check the push rod height. Want to make sure their shutting and opening to their full potential. If the intake ports and bigger on the new heads you'll need to have them milled to bring the compression back up.

[@travispeoples]

Naturally aspirated 323 cubic inches making 1.5 hp per cubic inch = 484 hp at the crankshaft... subtract 30% (145hp)for drivetrain loss and your at 339 at the tire... that's really good and your right on point for 323 cubic inches...

[@cmj115]

But the drive train doesn't lose 30% its more like 15-20% unless you drive a Mclaren then it's only about 10% lol.

[@ryanteixeira6449]

Manual 2wd cars are 10-15% so I’d imagine through an automatic and transfer case it could be north of 20%.

[@travispeoples]

@@ryanteixeira6449 exactly... it all depends on the vehicle... I've seen manual rwd muscle cars lose 30% at the wheels and we're talking about a 4x4 truck here... 30% is a real possibility, he's right on point with what he has.

[@ryanteixeira6449]

LQ9 Z71 I don’t know who told him 430whp from h/c/I 5.3.

[@dannyrbailey]

Good to see a good 5.3 now 6.0 build bc no one does them and you are the one I look for for my plans on my 5.3, it can only gets better from here

[@pcmcobra]

sry to hear the disappointment. Keep at it, man. Hope you learn something from this and come out ahead. I'd bet a lot of us learned some lessons on first or second ls swap. Keep it up, you will get there. No need for negativity.

[@calebhunter5343]

Try putting a corn stalk in the gas tank

[@donkeyandrews8962]

a fords pullin a chevy, that's just not right

[@travispeoples]

I highly doubt you'll find a problem... it's just the combo, a f.a.s.t intake might pick up another 20hp for $1,000 but without increasing the compression ratio significantly or cubic inch of the motor or adding boost, it is what it is.... at the end of the day it's only a naturally aspirated 5.3L motor... and they're pretty good in stock form...

[@BuckI2Bdad]

Pro tip, skip ahead to 3:30, 😒

[@wesleynelson8263]

DYNO= The Ultimate Lie Detector 🤣

[@chrisnicholson72]

Let it all wear in a little, I know the frustration, I built a bad ass motor for an older chevy and I swear the stock put down more power but over time it got better and more tweaking

[@james10739]

Why did you think 430 at the wheels i mean that's like 550 or more at the crank

[@0285rm]

Lol at 430wheel from cams and heads need a 408 to make power like that on pump not a stock bottom 5.3 no bottle

[@PEPE211606]

Just a 6.0 w a cam can do 430

[@crank1422]

I dropped my stock motor a couple years ago, and dropped in an LS327 crate motor. Not much different than the original LM7, except for a cam and valves, but supposed to put out 327Hp and 347ft-lbs. We dyno’d it and it put 292hp and 308ft-lbs to the tires with my stock transmission. I hate to say this, but that’s a problem with the dyno, not your truck. I mean, you can still check your compression and do what you need to do...but I find it hard to believe the stock motor put down those numbers with nothing more than some headers. With a 20% drivetrain loss, that’s closer to LQ9 numbers. Your truck sounds great, and I bet it runs fantastic.

[@btgperformance9234]

It wasn’t a stock motor? It’s a 5.3 with a TSP stage 3 cam, ported 862 heads, headers,

[@crank1422]

I gotcha. I watched both videos and I meant that for the first video where you said the motor was stock. Or at least I thought you said it was stock. The numbers it put down in this video is actually close to what I would expect rwhp to be with those mods...especially without a tune. Either way though, I look forward to future videos because I’m wanting to start getting some ideas on mods for mine.

[@6ohaintslow]

Minor setback for a major comeback!

[@barrscars8520]

Did you measure your pushrods before you installed them? If the heads are milled you may have needed shorter pushrods.

[@quickzilver333]

You gotta have the right combination with heads and cam. If they are miss match you will get disappoint with the out come. That's why I personally ask recommendations 1st on any well know performance shop for the right combination.

[@martinez1701a]

I would have stuck with cam only and threw on some cheap rebuilt 862 heads.

[@thatfastchevy]

I know these mods give the engine more flow but the way your truck was setup with intake and exhaust the engine already has good flow. To make power you need higher compression or more air volume to make your hp goals. Honestly I think your problem is there is no problem.

[@thatfastchevy]

You can have the air flow smooth as can be but if your not moving more volume of air not much gain that’s why adding fuel doesn’t do anything.

[@todell7008]

My thoughts exactly. I don't know what the chamber volume is on those new heads, but he may have actually lowered the compression.

[@todell7008]

On my LQ4 I used a flat top piston designed for an LQ9, milled the stock heads and a Stage 1 cam. I got BIG gains in the "seat of the pants" bottom end! DBR Perfomance custom tune for a work horse truck 2500hd

[@Ty81494]

My buddy builds these for drag cars all day long and makes 5.3 with 500-600hp all motor all day man

[@brandonwells3673]

Maybe they start as 5.3s, but theres no way I'm aware of to get 500+hp out of a 325cu in displacement without boost.

[@edwardsutphin2736]

Hey man its edward i met you down at the exuast shop the other day i gotta say i love your truck and your chanel youve given me a lot of new ideas for my 06 silverado

[@btgperformance9234]

Glad I got to meet you man, you've got a nice truck. Let me know if you need any help with anything.

[@edwardsutphin2736]

@@btgperformance9234 thanks man i might do that i got a lot of mods i wanna do as soon as i find a transmission

[@rtrick5040]

Edward I got a trans for ya. I’m in sc thou. I got 2wd 60s and 4wd. Or can rebuild the one you have now. Just lmk

[@edwardsutphin2736]

@project race truck how much for a rebuild

[@edwardsutphin2736]

@project racetruck

[@mhanson131]

i know its an old video but just seen it. initially thinking transmission is slipping maybe and robbing power. possibly torque converter multiplication is off. or you simply overshot the volumetric efficiency of the displacement of the engine with all of the extra air you gave it to breath. any updates to give us after 2 years?

[@RClark1022]

Still got a badass truck man! I kinda thought something was wrong with the dyno the first time because there's no way your truck should have made 313hp when it was stock.

[@chrisriddle5248]

Correct, stock should be sitting close to 270

[@dobetter4271]

Stock 4.8 and 5.3 makes 220 to 240hp stock

[@mttlws999]

Seems like you’re talking the difference from crank to wheel loss. From factory, that 5.3 is probably putting down 200 HP at the wheels. Seems right to me.

[@BIGcootZ]

I love this channel and I just know it's going to take off keep working!

[@samuelroberts8298]

I would check other parts of the drive train. The power loss could be after the flywheel, transmission, rear-end, etc.

[@OfficialCyanideBand]

Speed Engineering makes special spark plug wires for their headers. Truck and Car style

[@Framlife351]

Maybe not enough compression ratio to get the cam to make lunch. Or rocker preload is wrong due to the cam being ground on a different base circle. Push rod length?

[@samcrittendon7]

No chance of 430 whp out of that setup. 350 would sound believable

[@johnpresha829]

That truck stock did not make 300 whp bro. Those numbers are literally matching what other cammed trucks make on a dyno

[@gmracer2003]

Heads 799 head stock with good spring milled a little call it good I see people lose hp with high flow heads all the time

[@theorignalgrayson]

I know right 799 heads seem to always be the best on any 5.3 or any other vortec build

[@gmracer2003]

I’m running milled 799 in my 08

[@kohlguenette6669]

Stock Fuel systems can’t give the output

[@klone209]

Sometimes the valves don’t seat correctly straight out the box

[@firehawk956]

The initial bolt on dyno was a little high. Should've been Around 280 wheel hp realistically. I think your cam is holding you behind on your power numbers sounds very mild. Get something more aggressive with a higher lift to take advantage of the ported heads. 360ish wheel is more realistic.

[@AtoBPerformanceAndTuning]

What’s the chamber size in the aftermarket heads? What pistons did you use? Might sound crazy but put stock heads back on and retune tighter combustion chamber equals more compression. Look up Richard holdner. Lots of info on 706 stock heads.

[@dietdude7]

My guess is that the power enrichment and eq ratio is way to rich. My 03 sierra with a 5.3 had it running a afr of about 10.7 i tuned it to around 12.5 to 13 and its doing way better now

[@btgperformance9234]

Tuner got it to 12.7

[@Snip3rinth3mist]

@@btgperformance9234 12.7 with E10 is a little lean IMO. Try for a .88 lambda or 12.4ish AFR

[@anthonyrodriguez-fo4lz]

Like the program, did you check static compression ratio durring assembly? 10 to 1 is nice to start with. Hope you find the problem. Keep up the quality show, don't give up.

[@anthonyrodriguez-fo4lz]

Andy sounds like he knows his stuff🖒

[@ToddHLHG]

Im sorry to hear the power numbers are not what you were hoping for....Compression or leak down check may tell the tale.

[@tristanwendt1355]

I feel like ur dyno numbers from the old 5.3 were inaccurate and was a false reading tbh. I have longtubes,e-fans, full 3 inch exhaust, airaid full cai, and no cats , with a 91 octane dyno tune on a lm7 and my truck made like 240 or 250 on 33s. So i mean i feel like the numbers are accurate but could be off by 20 rwhp or so id almost try a different dyno or something. Cammed 5.3s with bolt ons generally make low 300s to the wheels

[@MrJiblack]

Here's an idea! Stand up toward the front an show numbers. It's not as loud up front verses the back of the truck

[@gearwolf9170]

It sounds like maybe the reader isn't working right? Which could be causing the readings to be wrong. Also you feel the difference when you're behind the wheel it honestly sounds more like an ecu or something in that area. Not sure but it seems more like that'll be the area to look

[@gsxrred1000]

There’s a very easy fix to this. Put the turbo on and let it eat. All the supporting mods u did will make more power at less boost. IMO cam /valvesprings/ turbo is hard to beat for making power cheap.

[@Neel-xe1po]

funny thing is that it looks and sounds like there's more power there. I can't even begin to think how bummed you must be. sorry man keep your chin up and push through!!

[@shanepeters8787]

Those numbers seem pretty accurate for a 5.3. What size cam are you running? It sounds on the small side from the video. If it's a small cam those numbers are right on par.

[@chriskubond6314]

Definitely didn't see that coming. Hopefully it's an easy fix and the motor don't have to be taken apart again.

[@bottlefedthoroughbred2471]

I have an 08 vortec max 6.0 with btr stage 2 and valve springs. Long tubes and with factory muffler made 340 to the tire and 357 torque

[@coreyscott1304]

Buddy of mine just built a 6.0 for his 2500 hd pile of cash in it he ended up with 345 to the rear wheels I’m building a LQ9 6liter for my 1500 but baby steps man not cheap and I know you didn’t cheap out but you’ll figure it out man

[@juanguerrero2282]

I also have an lq9 in my 1500 just ordered stp stage 3 cam. But yes baby steps

[@javitigerball]

Don’t be disappointed don’t forget about parasitic loss it’s roughly 15% or more due to the size of your wheels and tires so on motor your at about 376ish maybe more. So I’d say that’s a pretty fun truck

[@PiggyDetector]

There’s a possibility that the dyno could be messed up also. Also sounded like the tuner didn’t run thru the gears. Instead held it at a set rpm and floored it. That is something I have never heard of

[@HeadFlowInc]

I’m not sure if you ever figured out the issue, but your fuel injectors would need to be a minimum of 30# more likely bigger than that to support the power. What did you figure out?

[@Changitohd01]

Check your crank sensor bad signal means no power its happen to us in the dyno aswell

[@WAHDEEDOWthe2]

Sorry to hear this man. I know how it feels to be let down after installing something so exciting.

[@brandonlutze3316]

Im going to bet its the valves not sealing all the way if you boughtthe heads with valves in them. Learned from a old man, you never buy heads with valves in them if you do always have a valve job done.

[@travispeoples]

Not sure how much it would affect the numbers, but it looks like the truck is a little crooked on the dyno rollers... looks like the driver side rear tire is getting a little tire shine on the outside edge to me...

[@travispeoples]

Your heads are 862 castings... right? If so those are just CNC ported factory 5.3 heads... PRC is Texas Speed's own brand of aftermarket heads... they just shipped your CNC ported 862's in a PRC box... what does the dyno graph look like?

[@chrisriddle5248]

Not sure how accurate but read somewhere that for big numbers the 799 heads are supposed to be good

[@ottepedersen9219]

Did you put rings in it,may have blow by.

[@ryanlimon84]

Might try checking the MAF sensor. My lq4 swap wasn't performing properly in the higher RPM's and had a weird bog/stumble while under full throttle. Oil from the air filter had accumulated on the inflow side of the MAF. Actually took wiping it off with a q-tip to get the oil/dirt off. No codes thrown or anything showing up on the scanner. After cleaning it, the difference was night and day.

[@josephscaramuzzino1190]

340 to the wheels is 410 to the crank. Thats all your going to get out of whp without boost of some sort or boring and stroking.

[@dirtydiesel8998]

Dang i have 99 gmc with the 5.3 i was hoping to see this have a good number today hopefully things go good cant wait to see it go i wanna build my truck, your truck is inspiring me to build mine

[@shawncordeiro1150]

don't waist your money

[@lorenzolazos]

Maybe the Dyno was wrong the first time ?? There’s a guy by the name “itsjusta6” who dyno’d at 1000 with his mustang then got a smaller pulley and new stage 3 supercharger and got 900 rwhp on a better accurate dyno

[@oSuseJ]

Those 5.3’s make 200 horsepower roughly to the wheels stock. So for the modifications done to it. It seems like it’s right on par

[@btgperformance9234]

Mine made 313 with basic bolt ons, that dyno video is on my Chanel as well

[@oSuseJ]

bowtieguy97 yeah I saw the video and the description says CAI and tune, 313hp to the crank seems reasonable w those modifications. No cold air intake/ dual exhaust/ tune will get you 313rwhp on a 5.3 Lm7

[@ernestorodriguez8228]

Change your intake manifold to a tbss or fastlsxr and about 36 or maybe even 50lb injectors and fuel pump and you will see real gains because your have everything there as far as your way to supply more air to your engine the only thing your missing is that a better intake manifold and bigger injectors/fuel pump

[@MrBubbahunt9]

Did you go up in chamber and valve size?..that only works with a bigger bore on the 5.3..that's why most have good luck with the 5.3 heads on something with a bigger bore. it unshrouds the valves so they can flow...or maybe the tans is slipping. .thanks for the posts....

[@screaming86]

So please don’t get offended because I’m not trying to flame you or your tuner. With what you’ve done to the truck NOW it’s right on par with the power it should be making. That being said I watched your last dyno video and this one. I’m honestly betting on something in the first dyno run being setup incorrectly on the dyno giving you the 3xxwhp numbers with more Or less a stock truck. What gear is the tuner running it with? Also when you were dollying the truck why nut just unhook the driveshaft and zip tie it up out of the way?

[@drivinwithdrew7676]

screaming86 I thought the same thing could have happened,

[@drivinwithdrew7676]

He needs to go hammer on it on the street and see how it feels

[@screaming86]

Drew Marsalise yup typically nbs trucks with the lm7 make around 210-230whp stock. Cam bolt ons put them In the 320-340whp range.

[@drivinwithdrew7676]

screaming86 that’s how I feel, too I have a 383 stroker that runs to 7200 like easily probably barely makes 430 wheel

[@screaming86]

Drew Marsalise my cam/bolt on lm7 in my fbody I know makes nowhere near 400whp lol. It only pulled my 3500lb trans am to 114mph in the 1/4 with manifolds at the time.

[@firehawk956]

Post both dyno graphs of before and after.

[@Snip3rinth3mist]

Yes! Curious to see the difference in torque between the heads and cam

[@kleankustomz8454]

Sounded sick ass fuck man Chevy all day!..! Keep killen it!

[@dinkyray6876]

Maybe too late to comment but I would bet torque converter. If engine good then has to be transmission. Too bad it wasnt on an engine dyno...

[@Tyler_5521]

Ain’t nothing wrong with that look at the size tire you have minus drivetrain power loss that’s just about right think about all of your engine accessories taking power. That’s pretty good and just about right

[@lelandnjami]

Gen 3 5.3 is 245whp stock, cammed. Tuned about 290-310 Gen 4 tuned is 290whp cammed is 320-340whp normally. My supercharged 5.3 gen 3 made 334whp..

[@cmj115]

Scroll through these comments and try every single idea starting with the easiest and cheapest route until you figure it out. Apparantally there are about 100 different things that coukd be going wrong 😂. I can't wait till you do get it figured out tho.

[@Travelair2000]

Check your fuel pressure. I don’t think the stock pump will have the capacity to exceed 330hp. You’ll see the fuel pressure drop off suddenly when it reaches its limit.

[@lsxcole7039]

Out here in California on a stock 5.3 with bolt in’s only put out like 270ish to the wheels man your previous dyno shop you went to dyno could be way off a buddy of mine all motor LQ9 6.0 made 430 to the wheels today so don’t be to disappointed man

[@2012Z28Camaro]

He had headers and a tune i believe when he did the first dyno. I know he had a tune....i cant remember if he had headers for sure...

[@scottjeans6184]

I wonder if the ECM became "bricked" a term for factory ECM tuning capabilities.🤷🏼‍♂️

[@jonathanrider2062]

I have a 2006 been looking to do the same that said I would only make about 450 to the crank an around what u made to the wheels LSX performance shop in was telling me my stock 706 heads with some work done flows better then aftermarket truck flow heads an a btr stage 4 cam is to big to make numbers the motor just can do it without pro charging it or turbo is the only way to pull out the big numbers to the rear wheel

[@lanegeisewite1436]

Yeah sounds like the wrong heads for your combo. Factory heads with some porting and polishing and milled down a little bit might be your best bet especially with factory flat top pistons

[@xandertsaint8717]

love that truck with the rims n hd mirrors

[@GEDEntertainment2012]

Nothings wrong.... you liberate horse power sometimes vs actually adding

[@gregmf9427]

Do I hear the governor kicking in?

[@donniemartin7677]

No more low end?... Just a up in a couple hp.... sounds like you need to make up that lost compression with a snail shell

[@KevinBigg]

A dyno is just a tuning tool. Idk what all is done to the heads (im new) but if you opted for larger chambers you lost compression resulting in less power. I think 799 heads have 61.5cc chambers. If you did get heads with larger chambers you can have the heads milled down to up the compression

[@jordancomeaux6888]

799 are 64cc, he went with prc 2.5 706 heads that are 59cc. You are correct thought the dyno is just a tool, one that people get bent out of shape over.

[@d_theletter]

You will figure it out man just keep at it

[@ethanbible5264]

Damn man I hate to hear that for you I would have threw up hopefully you can get it figured out.. you spent a lot of money for the same s***.... I could only imagine how you feel I would be so devastated and mad.....

[@red93yj]

I think that's about where it should be.

[@Ls__Camaro]

Valve springs? Push rod length?

[@chrisriddle5248]

You want more power, bigger throttle body and injectors. You put a bigger cam in the motor it needs more force to get it started and more force to keep it spinning

[@TheShotgunGGjr]

I don’t understand when people buy “stages” for cams do the research look what durations and exhausts does the best for what you want and get what you need. You’ll be lucky to get 400whp naturally aspirated out of a 5.3 Pretty close but not quite. Need a turbo

[@sstevocamaro]

Those numbers are realistic bro!! Your original numbers BEFORE heads and cam wasn’t right!! We tried to tell you lol

[@deewyte5081]

I operate a dyno and that thing should have put down like 260 stock. And with those tires and of 4x4 might be lower than that

[@kylerwilley7964]

Nothing wrong with it, just how those 5.3’s are. I have an 02.... you’re not gonna see decent power for the 5.3 /6.0 unless it’s boosted somehow

[@kyleeasterly1832]

Not true, gotta have the right combo. I make 550 to the wheels n/a with a lq9

[@Mbowman223]

I'm not trying to be a dick but there's no way your original motor made that much! A stock 5.3 makes 295hp an that's not to the wheels! Something was messed up at the dyno shop Man! Plus when u drive your truck now I bet it feels faster than before right!?

[@garydroz3775]

i put a custom ground cam and milled the heads 10 thousands,full open exhaust and dyno tuned my uncles 5.3..it put down 331 hp with 286 ftbs...this dudes dyno is messed up...btw,my uncles 5.3 stock put down 223 hp

[@thingstoremember4489]

@@garydroz3775 I think that 220 who has a lot to do with the condition of the engine because Im intake, tune, exhaust, ignition, fuel, and fans in my 4.8 and I dynoed 279 hp.

[@jacksmith3189]

Amazin Blasian Mark, you are a passive-aggressive DICK

[@1sick_vic550]

No he’s probably right the 5.3 makes a lot more then advertised in these trucks I have a 99.5 Silverado that was tuned full exhaust intake minor custom grind cam with 3.73 rear gears and that 5.3 made more then his dynoed on 2 different dynos one down south from me and one 20 mins north of me the 5.3 from 99-02 made 305 at the wheels in most trucks and if it hasn’t been beaten on 24/7 then it can make more

[@gsxrred1000]

430 the wheels is not realistic out of a 5.3 na Unless you go super high compression on race gas

[@f30_boi98]

gsxrred1000 yeah I was thinking the same thing lol 😂 he might get 370 if he’s lucky

[@ryanteixeira6449]

Pierce Leonard even 370whp is a lot for a 5.3. Just 350-360 takes a healthy cam and heads.

[@MegaDcherry]

Depends on the year 5.3

[@gsxrred1000]

darryn chery don’t matter what year it is It ain’t gonna do 430whp n/a without 10k in upgrades and at that point why a 5.3

[@lifewiththehamptons2191]

gsxrred1000 I’m with you. 430 RWH equates to around 550hp at the crank with a stock transmission. I think the original dyno run with the stockish 5.3 may have been in error? Wait, over 400 crank hp from a stock 5.3 was an error. Your current numbers sound spot on.

[@jakeresch4332]

So how are them TexasSpeed parts?

[@DanielLopez-qm7kn]

If you want solid power turbo is the way to go. Of course your transmission would need upgrades to be able to handle it.

[@drivinwithdrew7676]

How does it feel driving? It doesn’t sound like a Valve issue, I could be completely wrong but I think the numbers from before are kind of high, it’s gonna be hard to get more than 450 hp at the flywheel without a lot of compression which might make 360 wheel on a STOUT 5.3 so your issues may be not be as bad as you think, it sounded like it would like to rev more the heads and cam, won’t help low end and mid range much meaning the torque could be down. If hp was still climbing at redline, I’d rev it higher and see what happens

[@drivinwithdrew7676]

I would do a compression check just to be safe, but the engine doesn’t smoke and it still sounds pretty healthy

[@EGGINFOOLS]

That's the numbers you should expect really with your setup. Your description says you are running the Diablo 87 octane. That's not right is it? I didn't hear you mention fuel or I just missed it. The Dyno graph would be able to show valve float issues. Especially since he bounced the Rev limiter a few times

[@5sinmex]

Check your pushrod length, you're also running dished pistons and a combination of too much head and cam for the small bore.