Chevy performance cnc ported ls3 heads

[Bo White]

479 to 494 is a good gain. I had simular gains when I put heads on my car.
http://www.camaro5.com/forums/showthread.php?t=445936

[QUICRNU]

I agree to certainly make the engine more reliable with the truunion bushings c5r chain, oil pump, dogbone, lifters etc etc.... but assuming all that was happening and the question remains, I chose to do the heads. 1200 shipped, 600 net if selling old heads.....*shrug*

If you aren't racing or going FI one day.... Maybe allocate towards mods that will help you use the power.

PS Dyno charts don't mean much from 1 car to another.

My car has never dyno'd above 586rwhp, but I do know my tune is right from it.

[WHAMMO]

Originally Posted by 07-SRT

Lol. Happy Dyno I've been using the same Dyno since 2011 when I became a member go ahead and look.... I've had srt's I've had (2) 5.0 and (2) Ls3 Camaros...370 horsepower stock Ls3 on the same dyno and you call that a happy Dyno as the numbers I made head and cam o same syno.Have videos too. It's called the right combination most people just randomly put stuff together here I'm sure you've read Bo White's threads how much power does he make and what's he run in the quarter ? Point being his car gets it in the 1/4 mile do to the combo...

You dont have to be offended. I did 37xrwhp with boltons. So my dyno was stingy and yours happy. Your car must be a beast. Im more interested in 1/4 pass but then you have all the weather factor and altitude comin in.
Dyno numbers means nothing... Tuning and mostly marketing tool nowaday IMO.

[07-SRT]

Originally Posted by Bo White

Me?
Im not questioning anything other than has anyone had a before and after with just heads. You answered my question on your previous quoted posted.

Wasn't directed at you BO.I was just making a point that GPI make some stout set ups their cam only is making close to my head's cam that's all

[07-SRT]

Originally Posted by WHAMMO

You dont have to be offended. I did 37xrwhp with boltons. So my dyno was stingy and yours happy. Your car must be a beast. Im more interested in 1/4 pass but then you have all the weather factor and altitude comin in.
Dyno numbers means nothing... Tuning and mostly marketing tool nowaday IMO.

I'm not offended sorry if you took my post wrong yes that is a stingy Dyno you have with those numbers. I was just trying to make a point that the dyno I use is about average across the country on SAE corrected numbers when looking at stock Camaros, Mustangs,Challengers that's all... and I agree with you I'd rather have a faster car than a larger Dyno number that's for sure...

[christianchevell]

if this one guy did heads for 1200 shipped they are not cnc ported ...btw, dyno jet not load bearing can be a big difference but they are what they are a measurement device, and his is even kind of a lame dyno sheet IMO no AFR, what corrections factor, and smoothing I would not deal with.... But chasing a dyno number is just that, I know I drive a stroker and have more torque than HP.... this post was about heads being worth it and the more you need the flow the more you benefit and that's kind of lost.....................................

So as long as we don't care...go ahead mill the heads for like 2 hp.....and screw your future chances of a large cam with those heads, I am at 11:1 the difference between 10.7 and 11;1 is squat btw look it up online and you will see little compression changes are worth not much, so his tuner.....

Here a dyno of my car with what I call a mild cam a stage three from cammotion .613/.578 and like 114+4 LSA like 25 and 35 duration...they as most cam grinders move on, my old tsp 235/239 cam had .639 and .623 lift and 112 lsa...but seems mot makers are shying away from big lift most likely due to people not changing their springs breaking and complaining and not doing a break in either...heck the old Cammotion line up is different...Oh well, I am just biding my time anyway until daughters college crap is over...



so not as clear as my old engine but I gained across the board on averages stroking even going milder cam, I attribute crap to the heads for now as I really know its would make like 5hp ....I have to maintain and daily drive until I get out of the fire...wallet big time...LOL

then ls7 small bore heads, hell maybe lsx stroker ....c-7 who knows, time ....

heres my nutted out ls3 2013 with the 235 239 cam, CAI with scoop and headers with HFC...electric PS ,NPP.....

heres my first dyno on old engine, cleaner and more max effort should have used that cam again but sold it with parts, and it was not a 8620 core its was just broken in right so looked prestine and could be resold even with over 10k on it....



Not all dynos are created equal, talk is cheap, don't let flash and bling blind you.. if you want to go big with stage four if they have it your going to be changing out the springs anyway just as much and with good oil as I use and good practices..I do a break in of the cam with BR40 oil and a run for break in just to get the thing run and hot as springs need a brake in also a couple hot cold cycles on the dyno.... so I don't worry..... I used to use a 235/239 cam from tsp 112 LSA with .639 and .623 lift and .675 prc springs, nice cam I am telling you listen to some utube clips.....LOL You will get good sound with lots of different cams and few go more upper end of the all out street roller cams peddled to us the working class non racers who are with cams we cant use and well make practicality..not so much with a big tunnel ram erc...LOL .750 lift its real...yup some cams are as some engines pushed at various practical levels for what you want to use them for and about a .630 range is pretty safe for stock slugs that and below, lots of good cams out there polluters and such... its also nice to go custom grind sometimes also I added to my lift .010 on my current cam now. PTV matters , these guys used to have one with real low ptv even compared to the TSP cam I had with its lift...it was the gsx6 of something like that... https://www.lgmotorsports.com/cam-ki...gigliotti.html But too go big or go home is hard on the parts LOL And budget for the future matters as maintaining things is often the investment of upgrades with a cam....

[marklsx]

I've been meaning to post in the dyno section. I recently installed:
- BTR stage 3 cam, platinum spring kit
- GMPP heads with bowl blend by BTR
- ATI 10% underdrive balancer
- Melling 10296
And ported throttle body, new lifters, trays, LS2 damper, 7.4" pushrods, stock LS3 head gaskets, tune. Already had Kooks 1 7/8 LTs with cats, Magnaflow 2.5" street cat back with resonated X pipe. I didn't dyno it before mods.

Final numbers were 464hp/422tq on a Mustang dyno. I thought I might get 10-15 more but I am very happy with it.

My commute is 120 miles a day. I love driving it. It does have some cam surge coasting at slower speeds but it's easy to drive around that. I would not change a thing about it.

[QUICRNU]

Mine were from summit on sale 1260 shipped when I bought them, GMPP CNC ported Heads.

Incase I was the "One guy" referred to earlier.

Good luck with your build OP, all the best.

[Jayjellyfish212]

Unless something changed ??? A lot of people on here make everything done to a car a bolt on classification based on some of the above info responses! Just reading some of this and had noticed some misconceptions.

Bolt on's items are typically air intakes, exhaust parts, manifolds, throttle body etc. and some cylinder head work. These are usually items of a stage 1 classification.

Cams, blocks and rotating assemblies such as stroker kits etc.. are not bolt on's and are classed as engine internals or engine work. This would also include cylinder head work. These are items of a stage 2 classification.

Superchargers, turbos, nitrous etc . are forced Induction modification. Including support items to accommodate such as rear end and drive shaft, clutch etc.. these are items of a stage 3 classification.

Maybe I'm wrong and things really changed but in 42 years I never known any internal engine part to be considered a bolt on! I don't know but perhaps if it has a bolt it's a bolt on and if it is a peel and stick it's a stick on!! Lol

[Bo White]

Correct. If it touches engine oil its not a "bolt on".

[QUICRNU]

Originally Posted by Bo White

Correct. If it touches engine oil its not a "bolt on".

[2013 ss1le]

Appreciate the info guys. I guess I should have been more specific as far as what my intentions are for the car and why I was looking at the gmpp heads over porting. I work in Beaumont Texas my car is in clarksville Tn. I work so much I don't have time to do the work myself I have had one day off in two months. To keep from tying up the mechanics shop of pulling my heads and sending them off and waiting to get them back I was just thinking I could get some modest gain by buying the gmpp heads and having him install them. Do headers,cam and heads at the same time with tune, instead of having to do tune two or three different times. After the engine work is done I am going to put an anti wheel hop kit in and drag radial and have fun at the track. I took it to music city raceway in October and 9.2 on 1/8th was the best I could get. A lot of that I am sure was because it was my first time racing. But it was no fun being that slow.

[NikolaiD]

I recently installed the GMPP heads on my LS3 and I'm beyond impressed with them.
GM advertises 10% more airflow and my AFR went from 12.8 to 14.1 in the whole rev range, so dead on.
Car's never been on the dyno, so I'm not sure what that means number wise, but the improvement was noticeable. I wouldn't be surprised to see close to 10% power gain out of them (I realize this sounds VERY optimistic, but it feels like there was a huge gain). This is on Tick stage 1 cam and 1 7/8 headers.

Only regret I have with them is not installing them at the beginning of the season.

[Bo White]

10% is huge on a 500hp engine.