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Old 01-11-2013, 01:14 PM   #3631
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Read an article on GMhightechperformance.com where they did back to back engine dynos of stock LS3 crate engine, then put some GMPP CNC ported heads on. Not much of an improvement at all, at least not worth shelling out the extra cash.

My question is, would it be worth it to port the LS3 intake when doing the top end swap to an LS2? Or just keep both intake and heads stock and slap 'em on?

Porting is debatable in its gains. It will flow better than the stock LS2 manifold either way though. If you want to save some money on the build, I'd skip it as you won't leave much on the table. FWIW, I did get mine ported.
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Old 01-11-2013, 02:58 PM   #3632
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Quote:
Originally Posted by TheElementalCashew...View Post
Porting is debatable in its gains. It will flow better than the stock LS2 manifold either way though. If you want to save some money on the build, I'd skip it as you won't leave much on the table. FWIW, I did get mine ported.

I have CNC ported aftermarket castings and a self ported LS3 intake. Hopefully Ill have some #`s soon :/
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Old 01-11-2013, 03:00 PM   #3633
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I have CNC ported aftermarket castings and a self ported LS3 intake. Hopefully Ill have some #`s soon :/

I am interested in seeing how your CNC heads do. Like I said, I did the intake and TB, but may do the heads down the road if it is worth it or I go with more cubes.
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Old 01-11-2013, 03:05 PM   #3634
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I am interested in seeing how your CNC heads do. Like I said, I did the intake and TB, but may do the heads down the road if it is worth it or I go with more cubes.

They probly wont do much, and hopefully DONT hurt me. But I am setup now for about anything I want to throw at it cube wise lol
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Old 01-16-2013, 09:37 AM   #3635
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Besides camaro5 and corvetteforum, any other large forums to troll for parts that you guys know of?
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Old 01-16-2013, 10:00 AM   #3636
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LS1Tech and the G8 board may have some stuff as well.
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Old 01-16-2013, 10:04 PM   #3637
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Originally Posted by cavell...View Post
Read an article on GMhightechperformance.com where they did back to back engine dynos of stock LS3 crate engine, then put some GMPP CNC ported heads on. Not much of an improvement at all, at least not worth shelling out the extra cash.

My question is, would it be worth it to port the LS3 intake when doing the top end swap to an LS2? Or just keep both intake and heads stock and slap 'em on?

It depends on how much you have to spend. You will make great power on stock LS3 heads and intake. If you have some extra cash, there is more power to be found through intelligent porting.

I had stock LS3 intake/heads for a long while, then got both ported and picked up 20+rwhp with the same cam and exhaust. This is when I was on the stock 6.0L block.
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Valve shrouding on a stock motor is fine though, because ultimately you're just going to blow it up anyways, and then bore out the motor. Voila, valve unshrouded.

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Old 01-17-2013, 09:49 AM   #3638
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Someone is selling these: http://paceperformance.com/i-7139127...-assembly.html new for $1k on another forum. Or, I can get brand new OEM regular heads for $600. Not sure if $400 is worth another ~20hp or not...
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Old 01-17-2013, 10:33 AM   #3639
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I've been debating this swap for a while an have a few questions for the people who have been running this set up for atleast a year. Anything you would do different or would you still stay with the ls3 swap and I'm new to this so flycutting is it ok for the stock pistons or should I upgrade.
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Old 01-17-2013, 01:59 PM   #3640
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Originally Posted by cavell...View Post
Someone is selling these: http://paceperformance.com/i-7139127...-assembly.html new for $1k on another forum. Or, I can get brand new OEM regular heads for $600. Not sure if $400 is worth another ~20hp or not...

Tell that to these guys who Buy FAST intakes. Im sure they would LOVE to only spend $400 for 20hp
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Old 01-17-2013, 03:19 PM   #3641
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Originally Posted by TheNewGoat...View Post
I've been debating this swap for a while an have a few questions for the people who have been running this set up for atleast a year. Anything you would do different or would you still stay with the ls3 swap and I'm new to this so flycutting is it ok for the stock pistons or should I upgrade.

Maybe. . . almost maybe going a little bit bigger on the cam. I would have done a 227/235 duration with about the same lift on the same LSA instead of a 224/230. But don't get me wrong, it's almost negligible and I have to be honest with myself in that I DD the goat.

I might have considered doing a five angle valve job and maybe some 'intelligent' intake porting on the heads along with porting the intake manifold (not that I can't do that later). I am however happy that I did mil for 63cc chambers and am using a 0.040 gasket. I also did some porting and polishing on the exhaust side to free the ports up some. TQ is amazing down low and I laugh at all those who say this setup is 'soft' down low.

Overall I'm happy with the swap. I had a lot of fun planning it and doing it and I learned a lot. I get crazy GM discounts so it was very affordable for me to do. Once I turn around and sell my old stuff, I think I might almost laugh at the cost.

It's a very affordable and very great setup if you do the right things. Good luck!
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Old 01-17-2013, 03:51 PM   #3642
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Thanks for the answers. How much can u cut from the stock pistons an remain safe.
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Old 01-17-2013, 03:56 PM   #3643
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Thanks for the answers. How much can u cut from the stock pistons an remain safe.

Couldn't comment with an exact answer. However, this is also very dependent on the cam you get. I didn't have to fly cut on mine. Others haven't with bigger cams. But you shouldn't have to do it anymore than 0.050.

Remember that 0.080 PTV for the intake and 0.100 PTV for the exhaust is what is considered acceptable and safe.
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Old 01-17-2013, 04:40 PM   #3644
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Thanks rocket
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Old 01-18-2013, 08:51 AM   #3645
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I typically notch them .060 deep and I feel that is plenty safe on a stock LS2 pistons from the measurements I took
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Old 01-18-2013, 09:19 AM   #3646
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Originally Posted by TheNewGoat...View Post
I've been debating this swap for a while an have a few questions for the people who have been running this set up for atleast a year. Anything you would do different or would you still stay with the ls3 swap and I'm new to this so flycutting is it ok for the stock pistons or should I upgrade.

Knowing what I know now, I would have done the following things differently:

1. Never gone with the stock hollow stem valves. They are absurdly thin-walled and failed spectacularly (and catastrophically) where a solid valve would have stayed in one piece and not cost me a motor.

2. Double springs. The intake valves in the LS3 are large, and when you use solid valves the weight is a bit much for some beehive single springs to handle. Valve float can be a problem if you don't have the right spring.

Aside from that, I was happy with the stock LS3 heads, and happy with them ported when I got around to it. I never flycut and still made 470+rwhp on a small (224/230 .5xx lift) cam. I think that flycutting is unnecessary, because you don't need a cam big enough to require flycutting (to make great power with these heads). The heads perform very well with small camshafts, and it really seems like the guys who get larger cams and flycut don't see any substantial horsepower gains over guys who don't. Just seems like a waste of money so you can put a bigger cam in your motor. IMO of course.

LATE EDIT: 3. I also would have put in link bar lifters from the start. I ended up using them and never had a stock one fail me, but it's not something I'd risk again.

Last edited by Beach Goat; 01-18-2013 at 12:33 PM.
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Old 01-18-2013, 10:48 AM   #3647
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I found this article, FYI for anybody looking to see differences between stock LS3 head castings, and different vendors who sell ported versions. They back-to-back dyno'd all of them on the same engine. This may have been posted before in here, but not going to search through every page... Article was written in Feb 2011, so pricing is probably cheaper on some of the items listed.

http://www.hotrod.com/techarticles/e...t/viewall.html
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Old 01-18-2013, 11:07 AM   #3648
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I found this article, FYI for anybody looking to see differences between stock LS3 head castings, and different vendors who sell ported versions. They back-to-back dyno'd all of them on the same engine. This may have been posted before in here, but not going to search through every page... Article was written in Feb 2011, so pricing is probably cheaper on some of the items listed.

http://www.hotrod.com/techarticles/e...t/viewall.html

I could see the flow numbers and prices being handy, but the actual HP and TQ gains between different heads probably would not be the same on a stock bottom LS2. Their motor used for testing was significantly larger.
On a separate note, some of the prices for those heads are HUGE!
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Old 01-18-2013, 11:22 AM   #3649
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I've been debating this swap for a while an have a few questions for the people who have been running this set up for atleast a year. Anything you would do different or would you still stay with the ls3 swap

For the net cash out of pocket it is easily the best option...

Different?

I would have replaced the stock GM lifters while I was in there...I would have bought stepped headers...I would have built the trans while it was out...I was happy with my numbers but I should have found a real shop to tune it..I would have put more money into the suspension and gear'd it toward running a faster ET...I would have made a trip to ATCO...I would make more of an effort to get a 10 sec time slip...
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Old 01-18-2013, 11:51 AM   #3650
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Got my set-up running the other day.

Stock LS3 heads milled .030"
Stock LS3 intake
Lunati cam, 227/235, .6xx/.6xx, 114
Lunati linkbar lifters

Wound up having defective lifters the first time around. Noticed the valves hit on three of the pistons ever so slightly. The deepest mark was not even .005", and the other two marks were only discernible in certain light. Being it was only three and the lifters were defective to begin with, I chalked it up to a loss of valve control, but I still replaced those three intake valves for good measure and flycut the pistons .030" for peace of mind.

She runs. Now it is time to tune.
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Old 01-20-2013, 02:19 PM   #3651
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She's alive! And yet untuned.

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Old 01-20-2013, 02:20 PM   #3652
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Originally Posted by MuhThugga...View Post
Got my set-up running the other day.

Stock LS3 heads milled .030"
Stock LS3 intake
Lunati cam, 227/235, .6xx/.6xx, 114
Lunati linkbar lifters

Wound up having defective lifters the first time around. Noticed the valves hit on three of the pistons ever so slightly. The deepest mark was not even .005", and the other two marks were only discernible in certain light. Being it was only three and the lifters were defective to begin with, I chalked it up to a loss of valve control, but I still replaced those three intake valves for good measure and flycut the pistons .030" for peace of mind.

She runs. Now it is time to tune.

Sounds good man! Looks like your cam specs are very similar to mine, it will be interesting to compare our numbers.
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Old 01-20-2013, 02:26 PM   #3653
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Mine is 227/238 .6xx .6xx 113
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Old 01-20-2013, 09:19 PM   #3654
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227/235 ftw. Sounds just like my slow setup
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Old 01-20-2013, 09:20 PM   #3655
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227/235 ftw. Sounds just like my slow setup

Wow, your setup is almost exactly the same as mine, except you are automatic.
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Old 01-20-2013, 10:00 PM   #3656
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She's alive! And yet untuned.
http://www.youtube.com/watch?v=B8Wx2zkeET8

Dude I need to change by damn boxers after hearing that thing.....sounds absolutely tits man! You're going to love your FTI grind, Im having a hoot with my custom Tiger Shark grind
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Old 01-20-2013, 10:11 PM   #3657
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Did the price jump on the heads. Or am I not looking in the right place all through this thread it says $350 but I can't find any place that is that cheap any help.
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Old 01-21-2013, 04:19 AM   #3658
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Re: L92 Heads/Info and Owners In Here

Summitracing.com has em for $359 new.

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Old 01-24-2013, 11:49 AM   #3659
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Cwarta, I saw you are going to the dyno today. Did you ever find 4.10 gears to put on?
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Old 01-24-2013, 11:50 AM   #3660
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Also, make sure to take some video
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