Help me spec out a cam for my LS7
#1
Help me spec out a cam for my LS7
Right now I am looking at running a 238/248 on 115. My needs have changed though. My car is no longer going to be a daily driver as I once thought, but it is going to be a primarily street driven. My previous setup was a surging beast, which I would like to avoid. I guess I want to push it to the edge of being gnarly. I want it lopey and powerful but not surge under 2k like it used to so it will be acceptable in traffic. I am finding it difficult to wrap my head around LS7 cams because of the various theories and big splits.
The car is an 6 speed LS7 427, PRC LS7 heads, 1 7/8 LT's, 3 inch GMMG exhaust, electric water pump, LS7 intake ported by me, and HS LS7 rockers. It'll run through a fabricated 9 inch.
Thanks for the help!!
BM
The car is an 6 speed LS7 427, PRC LS7 heads, 1 7/8 LT's, 3 inch GMMG exhaust, electric water pump, LS7 intake ported by me, and HS LS7 rockers. It'll run through a fabricated 9 inch.
Thanks for the help!!
BM
#2
For good power under the curve with nice street manners, aim for an intake valve closing point between 46-48 degrees ABDC at .050", keep your overlap at .050" under 15 degrees, and don't go crazy on the split. While a 12-15 degree split will help carry power better above 6500 rpm, it hurts drivability (since that matters in this case). Shoot for a 6-8 degree split and you can still run a fairly healthy size intake lobe without wrecking your street manners.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
#4
I've put over 10k miles on my C6 Z06 LS7 w/ a XER lobed 242/248 110+4, 25 degrees overlap. It surges under 1500rpm. Love the power, but probably would use the same lobes on a 114 or 115+3 if I was to do it over for a bit better driveability. So your initial thoughts are in line w/ my experience.
#5
I'd have to agree with Patrick G. I'm currently running a cam that I spec'd out when LS7 first came out, its a 242/256 113+2. Driveability is decent once I was able to tie-down the tune, but there is a slight amount of bucking (barely noticeable, if at all) between 1500-1800 rpms, otherwise its fine. It makes really good power given my combo, and has plenty of torque.
If your primary concern is power, with better driveability, I would run a 234/246 114 to help push out the rpm band a little more while keeping driveability easily manageable. Bump your compression to 11.5-6:1 which will help build your torque as well.
If your primary concern is power, with better driveability, I would run a 234/246 114 to help push out the rpm band a little more while keeping driveability easily manageable. Bump your compression to 11.5-6:1 which will help build your torque as well.
#6
I'd have to agree with Patrick G. I'm currently running a cam that I spec'd out when LS7 first came out, its a 242/256 113+2. Driveability is decent once I was able to tie-down the tune, but there is a slight amount of bucking (barely noticeable, if at all) between 1500-1800 rpms, otherwise its fine. It makes really good power given my combo, and has plenty of torque.
If your primary concern is power, with better driveability, I would run a 234/246 114 to help push out the rpm band a little more while keeping driveability easily manageable. Bump your compression to 11.5-6:1 which will help build your torque as well.
If your primary concern is power, with better driveability, I would run a 234/246 114 to help push out the rpm band a little more while keeping driveability easily manageable. Bump your compression to 11.5-6:1 which will help build your torque as well.