aussie_revhead

Ok, now to open up a can of worms again:

Should I stick with my chosen rectangular port combination or sell up for some aftermarket cathedral ports? In my favour is 415 cubic inches but what makes it a little harder is I don't want a big convertor for daily use. I have had a few hi stalls in the past, my last hot auto car had 5400 stall but I don't want to take that path with this car.

Rectangular or cathedral ....

PRE-Z06

Stick with the better flowing rectangular ports, your converter will be fine. If your previous quote is all your correct details, I'd recommend a different cam with factory rockers. Not sure what springs you are running, but I'd run as much static compression that will maximize DCR with new cam choice. Hope that helps, feel free to shoot me an e-mail for specifics.

HardcoreABN

when I was researching heads, every test I saw only put about a 20-25hp difference between GMPP CNC LS3 heads, tuner CNC LS3 heads, and CNC aftermarket heads....for $1500 you had better get more than 25hp....

I have GMPP CNC LS3 heads that are going on my 402 LS2 once I get the heads/pistons back from the machine shop. Having the heads milled to get 11.5:1 compression and the pistons cut for valve reliefs. I have the G5X3 cam now and would love to go with a G6X3 or G6X4 just don't have the funds currently.

With the same engine, except with 11:1, unported LS6 243s, LS1 intake/TB I made 407 @ 5400. Ran 12.4 @120 shifting at a moderate pace, launching at idle, 2.2 60' and not getting WOT until 3rd otherwise I would just blow the tires off. If I can't run 10.x with MT ET Street bias plys, skinnies, and a M12 (previously a M6) I just might burn the bitch to the ground. Would love 525ish rwhp but we will see.

aussie_revhead

Very nice, what does your car weigh?

aussie_revhead

Guys, I am thinking about this cam for my 415 LS3:

Comp 54-470-11 235/251@50 113LSA

What do you think for a strong street/ sometime strip car? Would the slightly milder 54-469-11 be a better choice (231/247@50 113LSA)?

Its been a long slow build and I want the end result to be worth while

Thanks

SpinMonster

In this video, the guy uses the SpinMonster cam that has been used a ton of times with LS3 heads.
The specs are 230 XFI/234XER 114+2. It has 4 degrees overlap and drives great. If you buy the trick flows, selling your entire LS3 top end gets you about $1200 so if you are thinking about porting the LS3 heads for $1500, its a big offset to the cost of trick flows which have much better resale value. I see many strokers barely hitting 500rwhp with ported LS3 heads and the stock displacement LS3 does that power with unported LS3 heads. The cost vs power gained is justified only by the buyer as what is important to him is personal. I'm just supplying a data point for the trick flows. I'm not selling anything.

Anyway, the results in this video are 521/469rw. A point higher on compression which would be an 8.7 DCR is about 535rwhp/485rwtq. He also didnt have an UD pulley or porting on the FAST. CK @ UPP does this install at the Colorado Springs CO shop (forum tuner).

Using the LG G6X3 cam which is a lot more overlap is the best match with the trick flows for all out power. With a compression bump, I'd think 545rwhp would be in the cards. The Trick Flow 225 and the G6 cam has made 530rwhp on a 6L (on the 1/4 mile challenge list) so its not out of the question.

This install is available from UPP and your car can be picked up/delivered.

Bob from Peak Speed sells the cam for $385 and he is a forum vendor. He also sells Trick Flow packages.
www.peakspeedshop.com

This guy consulted me (for free) to get this combo for a supercharged set-up. He left compression at 10.7:1 for boost but it would have made 4% more power on a full compression point higher.

This car has a full Z06 drive line.

BSPC608

Two more data points for Cam and Head for the LS3

2008 LS3 Auto with LG G6X3 cam and UD pulley resulted in 68 RWHP with stock intake.
Ported LS3 heads picked up 17 RWHP with stock intake.

SpinMonster

What was the actual numbers at the wheels? Can you post a dyno sheet? I'm curious at what RPM it made 400 tq by. The LG G6 is a great cam that made some of the best track results in the C6 1/4 mi challenge

dev1360

Suppose I'll share.

My PatG 230/238 .629/.629 112+3 along with halltech cai, OBX LTs, catless mids and Corsa sport trapped consistent high 128s. Best trap being 128.44 with high 1.6 60s. 2009 M6 stock intake and TB.

They are the EPS/cam motion ET lobes on intake and exhaust. Car drives great daily thanks to DSteck tuning and runs it's *** off at the track.

BSPC608

Away from the computer bracket racing today.

iPhone photo best can do today.

CUSVT

Great numbers! Who did the heads and what CR is it now?

aussie_revhead

What heads are you using dev1360?

Why do the production rectangular port cams run so much more exhaust than the customs or specialty cams? The spin cam only has 4 degrees more exhaust, the PatG above has 8 and the shelf comp I listed has 16 ....even with 113 centers wont such a large exhaust hurt overlap?

I want my LS3 to go without ruining its street manners, been there before as we all have so now its time to make it haul in style.

Thanks guys.

BSPC608

LG did the work and sent the heads out for porting CR is 11.58.

Original heads were damaged after porting during shipping. UPS repackaged heads improperly after chemical spill.

dev1360

Stock LS3 heads. My cam has 10* of overlap at .050. A good tuner can make it drive very well.

aussie_revhead

Ok the original discussion involved the 230xfi/234xer, are these lobes too aggressive for daily use? (Edit: I guess so since Comp lists them as their most aggressive lobe). What would be the equivalent of this for a 415 with rectangular port heads? I have factory hollow inlet valves, titanium retainers and tooley 660 springs.