LS6 vs. GT2-3 or similar custom grind on D1SC 347 w/ heads
11-19-2007, 07:39 PM
#1
LS6 vs. GT2-3 or similar custom grind on D1SC 347 w/ heads Looks like I'll be putting together...
-LS1 block, stock crank
-Eagle 6.125" rods
-Mahle 3.905" -16cc pistons/rings (can I pick up a steel top ring kit anywhere?)
-ARP main studs
-ARP 12pt head studs
-CNC'd 5.3 heads (282/208cfm@.500, 310/220cfm@.600...I know...don't have mid-lift #'s yet..228/86cc runners, 2.02/1.575)
-Pacesetter headers
-LS6 intake/ported TB or LS2 intake/NW90
Compression will be right around 9.4. What head gasket I use depends on whether block will need decking or not. I plan on running somewhere between a .040 and .053" to keep quench nice and tight.
D1SC head unit, 31x24x4 FMIC, 8-rib setup
Goals: Ability to trap mid-high 130s in a 3600lb car. VERY VERY tame street manners. Low-RPM drivability is important to me. 6-speed with 3.89s in the rear.
I really don't care much about a lopey idle. I'm happy with how my 224/228 110LSA sounds at 900-950rpms right now, but I don't NEED it to sound like it does. Even a stock-cammed full exhaust car sounds good to me
So, from reading on here and such, I've somewhat narrowed my selection down to a couple cams.
02+ LS6 204*/218*, .551"/.547", 117LSA
LPE GT2-3 207*/220*, .571"/.578", 118.5LSA
Or....something custom with very similar duration specs but using XFI lobes for a bit more lift to keep the valves open further for more of the revolution.
I can pick up a used LS6 cam in good shape for $125, and I can go with a softer spring than I'm running now, whereas the GT2-3 and/or a custom cam will be running me $400. At the levels I'd be dealing with, how much of a difference would I be looking at between the cams? 10-15rwhp? Or more like 40-50rwhp?
I can't see there being TOO big of a difference with the durations being that similar. I want to keep the cam small for good low-RPM drivability and torque. Just curious what others have to say.
EDIT: Want to keep the shiftpoint below 6600ish also, so if these cams drop off quickly after that....no loss here. Car is 98% driven on the street.
-LS1 block, stock crank
-Eagle 6.125" rods
-Mahle 3.905" -16cc pistons/rings (can I pick up a steel top ring kit anywhere?)
-ARP main studs
-ARP 12pt head studs
-CNC'd 5.3 heads (282/208cfm@.500, 310/220cfm@.600...I know...don't have mid-lift #'s yet..228/86cc runners, 2.02/1.575)
-Pacesetter headers
-LS6 intake/ported TB or LS2 intake/NW90
Compression will be right around 9.4. What head gasket I use depends on whether block will need decking or not. I plan on running somewhere between a .040 and .053" to keep quench nice and tight.
D1SC head unit, 31x24x4 FMIC, 8-rib setup
Goals: Ability to trap mid-high 130s in a 3600lb car. VERY VERY tame street manners. Low-RPM drivability is important to me. 6-speed with 3.89s in the rear.
I really don't care much about a lopey idle. I'm happy with how my 224/228 110LSA sounds at 900-950rpms right now, but I don't NEED it to sound like it does. Even a stock-cammed full exhaust car sounds good to me
So, from reading on here and such, I've somewhat narrowed my selection down to a couple cams.
02+ LS6 204*/218*, .551"/.547", 117LSA
LPE GT2-3 207*/220*, .571"/.578", 118.5LSA
Or....something custom with very similar duration specs but using XFI lobes for a bit more lift to keep the valves open further for more of the revolution.
I can pick up a used LS6 cam in good shape for $125, and I can go with a softer spring than I'm running now, whereas the GT2-3 and/or a custom cam will be running me $400. At the levels I'd be dealing with, how much of a difference would I be looking at between the cams? 10-15rwhp? Or more like 40-50rwhp?
I can't see there being TOO big of a difference with the durations being that similar. I want to keep the cam small for good low-RPM drivability and torque. Just curious what others have to say.
EDIT: Want to keep the shiftpoint below 6600ish also, so if these cams drop off quickly after that....no loss here. Car is 98% driven on the street.
Last edited by DuronClocker; 11-19-2007 at 07:46 PM.
11-19-2007, 08:38 PM
#2
I ran 138mph with an 01 Z06 cam, 9.8:1 compression 346, ported 98 heads with stock valves with a D1SC with 7.25/3.7 pulleys @ 3450lbs through an auto with an 8" converter shifting at 6500rpm (stock connecting rods).
So pretty much any cam you pick will get you there, I doubt there will be a 15rwhp difference between the 02+ LS6 and GT2 cam.
So pretty much any cam you pick will get you there, I doubt there will be a 15rwhp difference between the 02+ LS6 and GT2 cam.
11-19-2007, 11:01 PM
#6
Okay, so I guess its narrowed down to LS6 or this 216/220 cam. I'm just worried about low-RPM drivability. I know an LS6 cam will drive exactly like stock down low, but will the combination of the lower CR from stock and the 216/220 make the low-RPM stuff kind of rough? Could it be tuned to drive like stock off-boost?
11-19-2007, 11:15 PM
#7
I had an old 216/220 114 .525 comp in my old C5 years ago with an auto and stock converter and except for a little lope at idle you didnt even know it was there. I would imagine the XE lobe (I assume by the lift) would be even better.
But naturally the LS6 will drive like a stock car, not to mention be extremely easy on valvetrain parts.
But naturally the LS6 will drive like a stock car, not to mention be extremely easy on valvetrain parts.
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11-19-2007, 11:46 PM
#8
Hmmm, maybe I will go with the 216/220 then. From what I gather its got -16* of overlap.
98 LS1 = -26*
01 LS6 = -20*
02+ LS6 = -23*
GT2-3 = -23.5*
Current cam (using CamDoctor specs) = +9*
So it should be somewhat close to stock down low....at least much closer than my current combo Thanks!
98 LS1 = -26*
01 LS6 = -20*
02+ LS6 = -23*
GT2-3 = -23.5*
Current cam (using CamDoctor specs) = +9*
So it should be somewhat close to stock down low....at least much closer than my current combo
Thanks! 
11-20-2007, 01:27 PM
#12
Oooh, actually, since you've had both. Did you notice any difference in idle/low-end? I imagine the auto probably hides most of it though. My setup will be very similar to yours except the A4/M6.
As for the overlap, I used the VE calculator spreadsheet posted in a sticky in one of the other forums here.
As for the overlap, I used the VE calculator spreadsheet posted in a sticky in one of the other forums here.
11-21-2007, 04:51 AM
#14
http://www.exoticperformanceplus.com...Car.php?car=40
We have the GT2-3 in the C5, which is making 740 rwhp. Like KP said, probably not enough of a horsepower difference to make the extra cost worthwhile unless you get a great deal on one. Bob
We have the GT2-3 in the C5, which is making 740 rwhp. Like KP said, probably not enough of a horsepower difference to make the extra cost worthwhile unless you get a great deal on one. Bob
11-21-2007, 05:24 PM
#15
Yeah, actually Bob, that and the other build on your page is what made me like that cam Then I saw how similar the LS6 cam was and figured it might just be better to go that route for the handful of HP I'd give up.
Now I can get this 216/220 cam for a few bucks more than an LS6 cam, so I might as well go that route. I'm sure I'll be able to get the low-RPM tuned well on that, and I can drop the idle a bit to make it slightly lopey
Then I saw how similar the LS6 cam was and figured it might just be better to go that route for the handful of HP I'd give up.Now I can get this 216/220 cam for a few bucks more than an LS6 cam, so I might as well go that route. I'm sure I'll be able to get the low-RPM tuned well on that, and I can drop the idle a bit to make it slightly lopey
11-22-2007, 03:32 AM
#16
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My present cam is a 216/224 .565/.585 116 lsa comp cam
I started off with the gt2-3 and then bought my heads and cam used as a package off another member. I do like this cam a bit better than the Lingenfelter. But, I want bigger now.
Last edited by WHPLASH; 11-22-2007 at 03:39 AM.
