Comp LSK Lobes
On The Tree
Joined: May 2005
Posts: 140
Likes: 0
I'm running the LSK 243 duration lobes on a single pattern .653 lift w/ PRC duals and Morel lifters. Has .200" duration numbers close to XE-R 248 lobe, so it ramps aggressively after .050. They are about as close to solid roller performance w/ a hydraulic setup that I could find. I don't expect a lot of mileage out of the springs (10-15K?) but I like the way it hits and PRC's are not that expensive.
I've got them on the intake of my TRak cam! Revs like a ****!
__________________
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.
On The Tree
Joined: May 2005
Posts: 140
Likes: 0
Here are the specs on the whole series:
Comp Cams LSK lobes
Lobe#, Dur. @ .006", .050", .200", & Lift w/1.7 rocker
2124 265 215 142 .629"
2125 269 219 145 .632"
2126 273 223 149 .636"
2127 277 227 153 .639"
2128 281 231 156 .643"
2129 285 235 160 .646"
2130 289 239 164 .649"
2131 293 243 168 .653"
2132 297 247 171 .656"
2133 301 251 175 .660"
2134 305 255 179 .663"
2135 309 259 183 .663"
2136 313 263 186 .663"
Comp Cams LSK lobes
Lobe#, Dur. @ .006", .050", .200", & Lift w/1.7 rocker
2124 265 215 142 .629"
2125 269 219 145 .632"
2126 273 223 149 .636"
2127 277 227 153 .639"
2128 281 231 156 .643"
2129 285 235 160 .646"
2130 289 239 164 .649"
2131 293 243 168 .653"
2132 297 247 171 .656"
2133 301 251 175 .660"
2134 305 255 179 .663"
2135 309 259 183 .663"
2136 313 263 186 .663"
Trending Topics
I've been thinking about doing a 215/219 .629/.632 115+0 with a set of PRC 5.3 heads on my wife's car. I wonder how good it would idle and if it would be ok on P/V with the 5.3 heads unmilled??
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TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by gomer
I've been thinking about doing a 215/219 .629/.632 115+0 with a set of PRC 5.3 heads on my wife's car. I wonder how good it would idle and if it would be ok on P/V with the 5.3 heads unmilled??
TECH Junkie
Joined: Aug 2002
Posts: 3,726
Likes: 0
From: Fort Collins, CO
Originally Posted by gomer
I've been thinking about doing a 215/219 .629/.632 115+0 with a set of PRC 5.3 heads on my wife's car. I wonder how good it would idle and if it would be ok on P/V with the 5.3 heads unmilled??
Originally Posted by KingCrapBox
Lift doesn't affect PTV. Duration and LSA do. That cam would clear no problem.
Originally Posted by LOnSLO
LSK lobes are radical. They are designed to be "done" by 6500rpm max. In other words, they are some valve floatin *****.
XE-R lobes are 49 degrees from .006" to .050". That's fast.
LSK lobes are 50 degrees from .006" to .050. Not quite as fast.
Where the LSK lobes shine is the arc they form from .050" to peak lift. According to Comp, the LSK lobes better follow the natural arc of the cam. See, fast ramps and low lift (like an XE-R lobe) make the lifter want to "loft" off of the cam lobe. By adding more lift into the lobe design, Comp feels they can get more stable rpm ability.
My new Thunder Racing TRak Cam uses the 231 LSK lobe on the intake and it revs to the freakin' moon. I need to raise my rev limiter ASAP because the 6800 rpm redline feels like 6000. It would go 7500 no problem. For rev assurance, I'm running Comp 921 springs, but I could have shimmed my duals that came with my AFR 205s and been fine.
__________________
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.
Originally Posted by LOnSLO
Well then Gordon and his engineers at Comp are wrong, and so is a certain engine testing facility, seeing as I was told the exact same thing by both parties.
TECH Junkie
Joined: Aug 2002
Posts: 3,726
Likes: 0
From: Fort Collins, CO
Originally Posted by Brian@CompCams
Yes it does. If you kept the same duration and LSA, then keep adding lift...sooner or later it will hit.
This is true but at those durations it would take a bunch of lift to run into PTV problems. Especially with that LSA. Or if you put it in super advanced or retarded.