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2004-2007 Cadillac CTS-V Performance Mods Discussion, Ls6 build & questions in Cadillac CTS-V Series Forum - 2004 - 2007; Originally Posted by darkman Yeah, I noted the ambiguity but, decided blower guys don't usually ask about increasing compression...... Yea ...
  1. #16
    RyRidesMotoX is offline Cadillac Owners Enthusiast
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    Quote Originally Posted by darkman View Post
    Yeah, I noted the ambiguity but, decided blower guys don't usually ask about increasing compression......
    Yea true. I think the 10.7:1 is a little high. Especially since he is going to have the motor apart. If everything is remaining equal as far as stock measurements and only the quality of the metal is increasing, then I would just put some dished, maybe 15cc pistons in there. Lower the compression and run more boost.

  2. #17
    05 CTS-V LURKN is offline Cadillac Owners Member
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    Quote Originally Posted by darkman View Post
    Your original post provided very little detail - like: What broke in the motor and what did not? Why are replacing pistons?
    Ohhh f*** sorry about that hahaha

    So yeah I ment blown as in 4 broken pistons hahah

    So now knowing that, what do you think about 10:7 drop in pistons...will it run with no problems. .and everything else being stock?

    ----------

    Quote Originally Posted by RyRidesMotoX View Post

    Yea true. I think the 10.7:1 is a little high. Especially since he is going to have the motor apart. If everything is remaining equal as far as stock measurements and only the quality of the metal is increasing, then I would just put some dished, maybe 15cc pistons in there. Lower the compression and run more boost.
    Yeah sorry about that dude...
    I blew it as in Broke it hah 4 broken pistons. ..

    But yeah now knowing that..what do you think about 10:7 drop ins with everything else stock?...
    Will it run fine?

  3. #18
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: Ls6 build & questions

    Quote Originally Posted by 05 CTS-V LURKN View Post
    Ohhh f*** sorry about that hahaha

    So yeah I ment blown as in 4 broken pistons hahah

    So now knowing that, what do you think about 10:7 drop in pistons...will it run with no problems. .and everything else being stock?
    So you broke 4 pistons in a stock LS6 without damaging any other engine parts?

  4. #19
    05 CTS-V LURKN is offline Cadillac Owners Member
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    Quote Originally Posted by darkman View Post
    So you broke 4 pistons in a stock LS6 without damaging any other engine parts?
    As crazy as it sounds man...
    Yeah I got lucky!...
    2 on each side...
    Well I do need to get one of the heads resurfaced...it's kinda chewed up at the valve bowl...

    It's crazy...I have no idea how any of the broken pistons pieces didn't f*** up the valves...
    Dude it was bad...I found pieces of piston rings inside the cat..

  5. #20
    RyRidesMotoX is offline Cadillac Owners Enthusiast
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    It didn't chew up the block like a piece of bubble gum?

  6. #21
    05 CTS-V LURKN is offline Cadillac Owners Member
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    Quote Originally Posted by RyRidesMotoX View Post
    It didn't chew up the block like a piece of bubble gum?
    No man...Just a little scuff on one of the cylinder walls but that's about it.

  7. #22
    tmonttt is offline Cadillac Owners Member
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    Re: Ls6 build & questions

    Be sure that "scuff" is something that can be cleaned up with a .005 bore. There's not much room for error in these cylinder walls.

  8. #23
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    Becker is offline Cadillac Owners Fanatic
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    Re: Ls6 build & questions

    that block sounds sketchy to me , four broken pistons!? yikes

  9. #24
    RyRidesMotoX is offline Cadillac Owners Enthusiast
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    Did you check the water jackets for cracking and such? It would be easy to overlook something that would really jack stuff up later... If the block is going to a machine shop they should see anything but I wouldn't take anything for granted.

  10. #25
    05 CTS-V LURKN is offline Cadillac Owners Member
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    Quote Originally Posted by RyRidesMotoX View Post
    Did you check the water jackets for cracking and such? It would be easy to overlook something that would really jack stuff up later... If the block is going to a machine shop they should see anything but I wouldn't take anything for granted.
    Yepp just did last night... everything seems to be ok...Looks like I would just need to scuff it down just a bit..
    So now my plan is just going with OeM REPLACEMENT pistons....
    Could you point me to the right direction where I could find a set..New or used
    Thanks

  11. #26
    RyRidesMotoX is offline Cadillac Owners Enthusiast
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    Scoogin dickey, summit, jegs, whatever is cheapest... Summit has price match.

  12. #27
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    JFensty is offline Cadillac Owners Enthusiast
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    I would highly suggest against using used pistons. Cranks and rods are fine if resized. But not pistons.

    Sent from AutoGuide.com Free App

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    V for victory is offline Cadillac Owners Fanatic
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    Re: Ls6 build & questions

    I used a Eagle rotating assembly in my stroked 383, 1987 Monte SS street car build. made 475 / 675hp with a 100 shot of NOS. Great product! 10.02 1/4 mile @ 125mph had to sell as it would only one speed.....Fast! LOL

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