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2004-2007 Cadillac CTS-V Performance Mods Discussion, $hit just got real! in Cadillac CTS-V Series Forum - 2004 - 2007; Since you did not mention wipe pattern - On the Yella Terras you are supposed to check the wipe pattern ...
  1. #46
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    Re: $hit just got real!

    Since you did not mention wipe pattern - On the Yella Terras you are supposed to check the wipe pattern on top of the valve before establishing pushrod length. You add or subtract shim thickness to get the wipe pattern set. (There are threads/pics on other forums that show what the wipe pattern should look like. Generally, it is a thin line through the center of the valve.) http://forums.corvetteforum.com/1563994999-post1.html

    On the range of lengths your are getting - with my Trickflow 215s milled to a 61.5cc chamber, Jesel Shaft mounts, and EPS cam (base circle 0.0500 smaller than oem), and Morel lifters I use 7.367 (actual) 7.350 gauge length. The Morels require a 0.050" longer pushrod than LS7 lifters, so I would have been at 7.300 gauge or 7.317 (actual) with LS7 lifters. You setup is different obviously, but it does show that with aftermarket heads, etc. the length changes.

  2. #47
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    Re: $hit just got real!

    Quote Originally Posted by darkman View Post
    Since you did not mention wipe pattern - On the Yella Terras you are supposed to check the wipe pattern on top of the valve before establishing pushrod length. You add or subtract shim thickness to get the wipe pattern set. (There are threads/pics on other forums that show what the wipe pattern should look like. Generally, it is a thin line through the center of the valve.) http://forums.corvetteforum.com/1563994999-post1.html

    On the range of lengths your are getting - with my Trickflow 215s milled to a 61.5cc chamber, Jesel Shaft mounts, and EPS cam (base circle 0.0500 smaller than oem), and Morel lifters I use 7.367 (actual) 7.350 gauge length. The Morels require a 0.050" longer pushrod than LS7 lifters, so I would have been at 7.300 gauge or 7.317 (actual) with LS7 lifters. You setup is different obviously, but it does show that with aftermarket heads, etc. the length changes.
    We did sharpie the top of the valves and then see where the rocker head was sitting and it looked like it was right in the middle of the valve or just slightly above the middle. I should've said that. My local speed shop guy told us to use the shims regardless, so we never measured without them. Obviously I'll need to try with and without.

  3. #48
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    Re: $hit just got real!

    Quote Originally Posted by lollygagger8 View Post
    We did sharpie the top of the valves and then see where the rocker head was sitting and it looked like it was right in the middle of the valve or just slightly above the middle. I should've said that. My local speed shop guy told us to use the shims regardless, so we never measured without them. Obviously I'll need to try with and without.
    Sounds like you are on the right track.

  4. #49
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    Re: $hit just got real!

    Quote Originally Posted by darkman View Post
    Sounds like you are on the right track.
    I'll do it again and take pictures this time. Thank you for the link to that Darkman.

    I was wondering where to setup the dial gauge! It was pretty hard to get my fingers around the adjustable pushrod too. Then I had to put a small screwdriver on the adj pushrod to hold it from spinning while I adjusted it.

  5. #50
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    Re: $hit just got real!

    Got my pushod length. 7.393 basically 7.400. I used the stock pushrods and measure preload with the dial guage and got .060 so now I can order some up.

    Next potential issue:

    So my old LS6 fuel rail has a fuel regulator on the fuel rail itself.....the LS2 fuel rail on the right does not. Am I going to have to add one? How does the stock LS2 one get regulated?


  6. #51
    FuzzyLogic is offline Cadillac Owners Connoisseur
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    Re: $hit just got real!

    As far as I know, the LS2 is unregulated.

  7. #52
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    Re: $hit just got real!

    You do not have to add anything. If I recall correctly that "regulator" is really just a "shock absorber" for minor changes in pressure. (The book calls it a fuel pulse dampener. There is a diaphram operated regulator on the return line/ fuel sender assemby.)

    The LS2 rail does sit on spacers (about 1/2 inch thick).

  8. #53
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    Re: $hit just got real!

    '05 CTS-V, Maggie, Kooks, Hotchkis, Ground Control, Corsa, B&M, DSS/Hendrix, Full 3M Clear Bra, Autovation, V Headrests, CTS Console, STS-V 55w Fogs, Black Vette FRCs, Specter Werkes, Katech LS9 Clutch, SS Brake Lines, Heavymetals U-Turn Fuel Line Eliminator, Momo Combat Evo Shift Knob, Wldwhl Clear Sidemarkers, Linea Corse LC855 Wheels or OEM wheels w/'06-'07 Center Caps, plus a couple more. 472 RWHP/411 RWTQ (Mustang Dyno).

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    Re: $hit just got real!

    Quote Originally Posted by darkman View Post
    You do not have to add anything. If I recall correctly that "regulator" is really just a "shock absorber" for minor changes in pressure.
    This is correct, That is just a "pulse" damper. And as said already, you will be fine with the ls7 lifters, and those pushrods will be overkill for sure, we run standard comp hardened 3/8" pushrods in our lsx 454R builds (750+ HP NA, fairly large, steep cam) and spin that up above 7250rpms with no valvetrain issues (jesel shaft rockers and titanium valves)

  10. #55
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    Re: $hit just got real!

    Quote Originally Posted by darkman View Post
    You do not have to add anything. If I recall correctly that "regulator" is really just a "shock absorber" for minor changes in pressure. (The book calls it a fuel pulse dampener. There is a diaphram operated regulator on the return line/ fuel sender assemby.)

    The LS2 rail does sit on spacers (about 1/2 inch thick).
    Thanks man.

    Is this what you mean when you say the fuel rail sits on spacers?

    I'll try and find some at a hardware store. Fast wants too much for those bolts/spacers


    Quote Originally Posted by NC-V View Post
    This is correct, That is just a "pulse" damper. And as said already, you will be fine with the ls7 lifters, and those pushrods will be overkill for sure, we run standard comp hardened 3/8" pushrods in our lsx 454R builds (750+ HP NA, fairly large, steep cam) and spin that up above 7250rpms with no valvetrain issues (jesel shaft rockers and titanium valves)
    Thank you. I was sweating the LS7 lifter thing as Mamo was trying to give me $hit for using them.




    My speed shop guy wants to sell me 5/16" (.120 thicker wall) Hardened Comp Rods for $120 +$8.40 tax= $128.40

    Mamo wants to sell me 11/32" (.120 thicker wall) Hardened Manton Rods for $210 +$15 shipping =$235.

    Should I just get 11/32' or 3/8" Hardened Comp Pushrods then?

  11. #56
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    Re: $hit just got real!

    Quote Originally Posted by lollygagger8 View Post
    Is this what you mean when you say the fuel rail sits on spacers?

    My speed shop guy wants to sell me 5/16" (.120 thicker wall) Hardened Comp Rods for $120 +$8.40 tax= $128.40

    Mamo wants to sell me 11/32" (.120 thicker wall) Hardened Manton Rods for $210 +$15 shipping =$235.

    Should I just get 11/32' or 3/8" Hardened Comp Pushrods then?
    The spacers are about 1/2 inch thick.


    On my Trickflows I just had room for 11/32 pushrods but not for 3/8 pushrods. In making this determination (as indicated on the Manton website) it is okay for the pushrod to barely touch the head - effectively using is a "guide", but you must be sure there is no lateral pressure on the pushrod at the pushrod/head clearance point.

  12. #57
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    Re: $hit just got real!

    Quote Originally Posted by darkman View Post
    The spacers are about 1/2 inch thick.
    I'd rather not stack washers, but I guess I will if I have to.

    Quote Originally Posted by darkman View Post
    On my Trickflows I just had room for 11/32 pushrods but not for 3/8 pushrods. In making this determination (as indicated on the Manton website) it is okay for the pushrod to barely touch the head - effectively using is a "guide", but you must be sure there is no lateral pressure on the pushrod at the pushrod/head clearance point.
    Maybe I'll just go with 11/32" then.

    Manton > Comp??? Or is it semantics/paying for the name at this point?

  13. #58
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    Re: $hit just got real!

    I don't think Comp makes and 11/32 in LS engine pushrod based on my reading of their 2012 catalog. Do keep in mind Comp lengths are stated in "gauge" length while Manton's are ordered in actual length. (0.017" difference).

  14. #59
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  15. #60
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    Re: $hit just got real!

    Quote Originally Posted by darkman View Post
    I don't think Comp makes and 11/32 in LS engine pushrod based on my reading of their 2012 catalog. Do keep in mind Comp lengths are stated in "gauge" length while Manton's are ordered in actual length. (0.017" difference).
    You are correct. Comp only goes up to 5/16...but I can get them at .120 wall thickness. So order em up??
    Plus I'd hate to have a problem down the road and have to order special pushrods.

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