Lets make a frankenstein... LY7/LLT...
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 3 of 3
V6: 3.0, 3.2 LA3, 3.6 LY7, 3.6 DI LLT Discussion, Lets make a frankenstein... LY7/LLT... in Cadillac Engine Technical Discussion; Something we are throwing around in the Gen1 CTS forums, is putting an LLT intake on a LY7. Nobody I ...
  1. #1
    DavidBoren's Avatar
    DavidBoren is offline Cadillac Owners Enthusiast
    Automobile(s): Volant, VMAX, RX catch can, tranny cooler... RIP
    Join Date
    Jul 2012
    Location
    Portland, OR
    Age
    29
    Posts
    509

    Lets make a frankenstein... LY7/LLT...

    Something we are throwing around in the Gen1 CTS forums, is putting an LLT intake on a LY7. Nobody I know of has the parts laying around to test the fit, but we are hoping we can experience some of the awesome performance gains seen with ported/polished LLT intakes on Camaros.

    The LY7 only has a VMAX spacer, and soon a RX performance throttle body, available for it. And no one has really messed with porting the LY7 intake (that I know of).

    The LLT intake is a far better design and has more available for it. RX has a throttle body for the LLT, as well as a VMAX spacer. MACE engineering makes a whole host of spacers, each with their own purpose and proven results. And MACE has a US-based shop that offers a porting/polishing service for the LLT intake.

    I am currently waiting for the RX LY7 throttle body to come out, and when it does I am installing it and my VMAX spacer and RX catch can on my LY7. I am hoping to pick up an LLT intake just to see if it lines up when I have everything torn apart.

    A couple issues we are facing is port position, bolt locations, and PCV/vacuum lines.
    Also need to know if throttle wire connectors are similar, or can be spliced/modified between the two. Anyone interested in contributing to this mad-scientist cause is welcome to chime in.

    I will gladly accept donations in the way of LLT intake manifolds.
    Or if anyone has access to a LY7 and an LLT intake, if you could see if it looks likes its possible, that would be greatly appreciated as well.

    ----------

    Here is a link to the other thread. It has some information pulled from Camaro forums discussing the LLT intake modifications we want access to. Link:
    http://www.cadillacforums.com/forums...ntake-ly7.html

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    DavidBoren's Avatar
    DavidBoren is offline Cadillac Owners Enthusiast
    Automobile(s): Volant, VMAX, RX catch can, tranny cooler... RIP
    Join Date
    Jul 2012
    Location
    Portland, OR
    Age
    29
    Posts
    509

    Re: Lets make a frankenstein... LY7/LLT...

    Also thinking about the LFX rotating assembly and valvetrain. The LFX has 38.3mm intake valves Vs. the LY7/LLT's 36.96mm valves. And I read somewhere about a materials change in the connecting rods for the LFX that made them stronger.

    With this sort of complete engine rebuild, obviously some head work will be done, especially if we switch to larger intake valves, it will be necessary. I think shaving a couple thousandth off the heads to change the compression ratio from 10.2:1 up to 11.5:1 (like the LFX) might help, too. Valve clearance on the pistons might need to be addressed at that point.

  4. #3
    DavidBoren's Avatar
    DavidBoren is offline Cadillac Owners Enthusiast
    Automobile(s): Volant, VMAX, RX catch can, tranny cooler... RIP
    Join Date
    Jul 2012
    Location
    Portland, OR
    Age
    29
    Posts
    509

    Re: Lets make a frankenstein... LY7/LLT...

    Intakes wont swap. Bolts are backwards.

    On the LY7 intake, the rear-most intake manifold bolt is on the PASSENGER SIDE:
    alloytec15.jpg
    On the LLT intake, the rear-most intake manifold bolt is on the DRIVERS SIDE:
    1992546.jpg

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting