Max lift on LS6 without flycutting?
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2004-2007 Cadillac CTS-V Performance Mods Discussion, Max lift on LS6 without flycutting? in Cadillac CTS-V Series Forum - 2004 - 2007; Who here has over .600 lift and hasnt fly cut pistons? (I want to run something crazy like a .660 ...
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    Max lift on LS6 without flycutting?

    Who here has over .600 lift and hasnt fly cut pistons? (I want to run something crazy like a .660 for the hell of it.)

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    Re: Max lift on LS6 without flycutting?

    I've run .649 before the blower. I think any father than the .649 and your running on the edge. If something happened it would kiss a valve and your done. If you go over to LS1tech, there are a lot of cam guys over there that can help too.

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    Re: Max lift on LS6 without flycutting?

    I think you can run a MS4 cam w/o the flycut, but it would be close.

    I'm running a Comp Cams 54-448-11 Xtreme XE-R GM Gen III LS1 LS6 Hydraulic Roller Camshaft
    RPM Operating Range-2800-7200
    Intake Lift-.605"
    Exhaust Lift-.609"
    Intake Advertised Duration-287°
    Intake Duration @ .050" Lift-238°
    Exhaust Advertised Duration-289°
    Exhaust Duration @ .050" Lift-240°
    Lobe Separation Angle-112°

    If I was going to do it again, I would go with a smaller cam, but depends on what you want (I think I am getting old!)..

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    Re: Max lift on LS6 without flycutting?

    The MS4 cam is what I had.

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    Re: Max lift on LS6 without flycutting?

    jebus! 238/240 @.050? How was driveability?

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    Re: Max lift on LS6 without flycutting?

    It totally depends on the duration and ramprate/lobe profile. This will tell you how much you can open the valve at any given time.

    Spec your cam based on your needs, not on some arbitrary lift #.

    Once you start moving into the .620+ though with an agressive duration and ramp rate, you seriously need to start thinking about checking the PTV. I've even heard that it is HIGHLY recommened to check PTV with the MS4.

    -Chris

    P.S. my cam is .610 / .588
    2005 CTS-V:No Roof|T2+Eibachs|Corsa|UUC:Shifter, 2pc rotors, B-Lines, Motor/Tran Mounts, Diff Bushings|LPE CAI|FFV IntakeTube|Hotchkis Sways|Kooks 1.75 Coated LTs+cats|KARS III |Mamofied Fast90 + NW90|224/228 111+0 XFI/XE-R .609/.588+Dual Springs|ATI 25% UD Pulley|YT 1.7" UltraLites|Melling HiFlow OP|Cloyes Hex Adjust Timing Set|Lucas 42# Flow Matched Injectors|Katech LS9X Twin-Disk ClutchMustang Dyno Tuned (SAE): 412rwhp / 380 rwtq
    2012 CTS-V:No Roof|Wagon|M6|Recaros|Bone stock (for now)

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    Re: Max lift on LS6 without flycutting?

    Quote Originally Posted by trukk View Post
    It totally depends on the duration and ramprate/lobe profile. This will tell you how much you can open the valve at any given time.

    Spec your cam based on your needs, not on some arbitrary lift #.

    Once you start moving into the .620+ though with an agressive duration and ramp rate, you seriously need to start thinking about checking the PTV. I've even heard that it is HIGHLY recommened to check PTV with the MS4.

    -Chris

    P.S. my cam is .610 / .588
    Yeah, after speaking with livernois motorsports I was talked into a:

    230/236 .630 .610 112LSA

    THEY HAVE SPRINGS RATED TO .690 lift!

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    Re: Max lift on LS6 without flycutting?

    Quote Originally Posted by CTS-Voodoo View Post
    Yeah, after speaking with livernois motorsports I was talked into a:

    230/236 .630 .610 112LSA

    THEY HAVE SPRINGS RATED TO .690 lift!
    Make sure you get the right spring for the cam you end up getting. Keep in mind that the LS6 has hollow intake valves, and sodium filled exhaust valves, that aren't as strong as comparable solid stainless valves. I've heard urban legends about the valve tops popping with too much seat pressure, but I'm not sure I completely buy that. STILL....it wouldn't hurt to be safe/smart (i.e. use the right spring for the job, and not some mammoth spring for no real reason).

    With all that said...I have .610 lift cam, and have the patriot gold extreme dual springs, rated to .660. I went with these based on the agressive ramp rates on my cam (XFI / XE-R). Zero issues over 25k(ish) cam miles. I did go dual spring, as a slight added prtection. If one spring fails, you have the other to hopefully control the valve long enough to shut the engine down before it eats a valve.

    -Chris
    2005 CTS-V:No Roof|T2+Eibachs|Corsa|UUC:Shifter, 2pc rotors, B-Lines, Motor/Tran Mounts, Diff Bushings|LPE CAI|FFV IntakeTube|Hotchkis Sways|Kooks 1.75 Coated LTs+cats|KARS III |Mamofied Fast90 + NW90|224/228 111+0 XFI/XE-R .609/.588+Dual Springs|ATI 25% UD Pulley|YT 1.7" UltraLites|Melling HiFlow OP|Cloyes Hex Adjust Timing Set|Lucas 42# Flow Matched Injectors|Katech LS9X Twin-Disk ClutchMustang Dyno Tuned (SAE): 412rwhp / 380 rwtq
    2012 CTS-V:No Roof|Wagon|M6|Recaros|Bone stock (for now)

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    Re: Max lift on LS6 without flycutting?

    Quote Originally Posted by CTS-Voodoo View Post
    jebus! 238/240 @.050? How was driveability?
    The drivablity was bearable with the 1st tune, but not happy (Made 438HP with cam/heads/ported TB). Tuner claimed it was the best he can do (which was BS). I changed tuners when I put the intake/injectors/90mm TB gained +30HP/20TQ, but drivablity suck (Idle hunting, running rich...same as before but worse..). What's nice about my new tuner is that he will work to improve drivablity for no additional charge! It took 2x for him to tune it and I am now very happy with the drivablity (90% happy). It doesn't idle search much (10%, and never stalls) and no issues with the AC on. The only problem I get is the richness of exhaust smell (I have no cats) which is about 10-15% of the time. But I think its worth it. Low end torque is lower, but it pull like a mofo at 4k+. The new cam Livernois Spec out is what I would get but maybe a LSA113. Make sure you get a tuner that doesn't just tune for idle/WOT.

    My 2cents.

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    Re: Max lift on LS6 without flycutting?

    I also have the patriot gold extreme springs. Ran them with the MS4 cam and now the LG cam that is in now and have never had a single problem with them. They are really cheap compared to the comp springs but even with the MS4 and driving like a nut, I never a had a problem.

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    Re: Max lift on LS6 without flycutting?

    thanks guys. I appreciate the information, selecting a cam always makes me nervous, despite the fact Ive done it to every car I've owned

    in the event anyone else wants to go shopping:

    LS6 double roller timing chain
    .690 lift double valve spring kit
    232/232 .595 .595 114LSA (not mine but close enough)

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