LS3 Cam Help
LS3 Cam Help Building an 416 ci LS3 for a guy and was just curious what some of the guys on here would use for a cam. Its going in a 69 camaro that will be street drivin but the guy isnt too worried about driveability. He is expecting the car to weight about 31-3200lbs. Below are some specs.
416ci LS3
GM CNC ported LS3 Heads
11.3:1 compression
Fast 102mm intake
3.90 gears
T56
416ci LS3
GM CNC ported LS3 Heads
11.3:1 compression
Fast 102mm intake
3.90 gears
T56
If drivability isn't an issue, then a custom grind would be the way to go.
If it were up to me this is what I'd use:
285/298@.006"
235/246@.050"
158/166@.200"
113LSA 109ICL 117ECL
235/246 .621"/.615" 113+4
That's going to have a great muscle car idle with 15 degrees overlap, but no so much that drivability goes totally out the window. With the large LS3 intake valve and the long runner fast intake you can go too far on the overlap and end up over-scavenging the intake runner which will hurt power production.
With a 4" stroke and a Fast intake with rectangle port heads I tend to stay under 16-18 degrees overlap.
If it were up to me this is what I'd use:
285/298@.006"
235/246@.050"
158/166@.200"
113LSA 109ICL 117ECL
235/246 .621"/.615" 113+4
That's going to have a great muscle car idle with 15 degrees overlap, but no so much that drivability goes totally out the window. With the large LS3 intake valve and the long runner fast intake you can go too far on the overlap and end up over-scavenging the intake runner which will hurt power production.
With a 4" stroke and a Fast intake with rectangle port heads I tend to stay under 16-18 degrees overlap.
The best cam I ran in my 403 setup was a 230-240 111 - The Justin Timberlake cam. That build made 530-480 and was extremely mild. I also ran a 234-240 112 on XE-R lobes and that also worked very well - within a few HP of the JT cam but the JT cam had a little more on the bottom and middle.
Lots of info in the build thread in my sig.
Lots of info in the build thread in my sig.
The best cam I ran in my 403 setup was a 230-240 111 - The Justin Timberlake cam. That build made 530-480 and was extremely mild. I also ran a 234-240 112 on XE-R lobes and that also worked very well - within a few HP of the JT cam but the JT cam had a little more on the bottom and middle.
Lots of info in the build thread in my sig.
Lots of info in the build thread in my sig.
Thanks for the input it all good info. I'm not too familiar with LS3 heads so any real world experience is greatly appreciated. The customer seems pretty set on a Comp 297LRR HR14. What do you think?
297/313 advertised
247/263 @.050
.624/.624 lift
114LSA
111 ICL
297/313 advertised
247/263 @.050
.624/.624 lift
114LSA
111 ICL
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TECH Enthusiast
Joined: Jan 2010
Posts: 578
Likes: 4
From: REALITY
No need for the "donkey dick" cam
You better have a good tuner or be one yourself to tame 27 degrees of overlap for a street driven car with LS3 heads. Excessive Overlap and reversion will not be your friend and may **** your customer off later once he has to drive the damn thing.
Sounds like you and your customer need to have a "realistic talk".
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I have a Lil more compression than that but I kick myself in the head for not going bigger. With the Lsr cam in my sig I put down 515?hp /510? TQ on a mustang dyno with 110* shop air with a spooled 9" and 4.11 gears and a viperized T56, Drive ability is actually pretty damn good but I can careless about that!! At 6500 where I peaked I was starting to pull vacuum.
I should of gone with this one,
http://www.compcams.com/Company/CC/c...csid=1415&sb=0
Or this one,
http://www.compcams.com/Company/CC/c...csid=1417&sb=0
I still might but not sure right now.
Here is a vid of it getting tuned and its first start up at Straightline in New Lenox Ill.
Yea it was a Friday the 13th in July lol
I should of gone with this one,
http://www.compcams.com/Company/CC/c...csid=1415&sb=0
Or this one,
http://www.compcams.com/Company/CC/c...csid=1417&sb=0
I still might but not sure right now.
Here is a vid of it getting tuned and its first start up at Straightline in New Lenox Ill.
Yea it was a Friday the 13th in July lol
Staging Lane
Joined: Apr 2012
Posts: 94
Likes: 0
From: Pacific NW
I know a guy that used the same cam on a 427 LS2, hand ported L92 heads, LS intake, ~12:1 compression. Results: 616 FHP, 584 Trq, peak power @~6,000 RPM, peak torque @ 4,500 RPM.
If this a street driven car:
No need for the "donkey dick" cam
You better have a good tuner or be one yourself to tame 27 degrees of overlap for a street driven car with LS3 heads. Excessive Overlap and reversion will not be your friend and may **** your customer off later once he has to drive the damn thing.
Sounds like you and your customer need to have a "realistic talk".
No need for the "donkey dick" cam
You better have a good tuner or be one yourself to tame 27 degrees of overlap for a street driven car with LS3 heads. Excessive Overlap and reversion will not be your friend and may **** your customer off later once he has to drive the damn thing.
Sounds like you and your customer need to have a "realistic talk".
It will sound nasty but will be a sheep in wolves clothing. Way, way, way too big...I actually agree with Bozzhawg for once and that reversion and over scavenging will be very bad with that cam and over scavenging a Fast intake is NOT the way to cam an intake with a runner that is 10" long.
