Home Page Store Engine Packages Photo Albums

Results 1 to 4 of 4

Thread: New to this forum....

  1. Default New to this forum....

    New here.....vehicle is a 2005 GTO 416,6 speed,3.73 gears,non daily driver but mostly street driven...most LS forums are a sales orgy and I wanted some opinions about cylinder heads from a company that uses factory heads in all their packages wuth good success.Running 243's w/2.08/1.575's right now but thinking of a move up to Dart Heads.TFS and E.T. Performance, now Performance Induction, seem to be the hot s**t now.AFR's are basically a 243with a thicker deck.
    Had either a head gasket failure or a head crack so the motor is coming out.Also,after only 900 miles on the new 416,its using oil.(3qts in 900 miles).
    Debating going down the stock head route again or going to a Dart and having the race gead shop that did my stock heads do the CNC work and assembly.The TFS was an option but that seems like a max effort high RPM high flowing head for light vehicle(vette or a race only Fbody)
    My 416 car made 472rwhp/475rwtq w/ stock heads,2.08/1.575 ,CNC'd ports and chamber and a 234*/238 .650" cam.My stock bottom end 6.0 made 420rwhp/390rwtq with stock heads,2.02/1.575 CNC's ports and chambers and a 230*/236* .629" cam. The 416,though it pulled hard,seems like some power is being left untapped....and every one says its the heads...so I came to a forum run by a company that runs nothing but factory heads and does just fine.Unless i go to one of the non-stock valve angle heads,the stock 15* heads,stock and aftermarket all seem to be capable,and most of the designs look just like the LS6 casting 243's......
    Any ideas or advice????

  2. #2

    Default Cylinder Head Suggestions for LS 416 CID Engine

    We normally would run the Lingenfelter CNC ported L92/ LS3 cylinder heads or Lingenfelter CNC ported LS7 heads. Both would require an intake manifold change and a minium of a 4.00" bore size. You will also need to have L92 or LS7 pistons so the valve reliefs are correct.

    L92/LS3 Flow Specs
    Intake valve lift / Exhaust valve lift
    .200 - 158 cfm / .200 - 116 cfm
    .300 - 230 cfm / .300 - 161 cfm
    .400 - 282 cfm / .400 - 201 cfm
    .450 - 302 cfm / .450 - 213 cfm
    .500 - 322 cfm / .500 - 220 cfm
    .550 - 340 cfm / .550 - 226 cfm
    .600 - 350 cfm / .600 - 231 cfm
    .650 - 358 cfm / .650 - 234 cfm
    .700 - 344 cfm / .700 - 237 cfm

    more....L92/LS3

    LS7 Flow Specs
    Intake valve lift / Exhaust valve lift
    .200 - 174 cfm / .200 - 120 cfm
    .300 - 256 cfm / .300 - 164 cfm
    .400 - 312 cfm / .400 - 200 cfm
    .500 - 352 cfm / .500 - 222 cfm
    .600 - 384 cfm / .600 - 234 cfm
    .650 - 395 cfm / .650 - 239 cfm
    .690 - 396 cfm / .690 - 242 cfm

    more....LS7


  3. Default

    Them L92 heads are sweet but the whole spending another grand for an intake knocks the wind right outa my sail.

  4. Default

    so chances are since i bought ans LS3 based rotating assembly and im running cathedral port heads, the reliefs are probably wrong...hmmmmm..you think some one involved in the build would have said that..oh well..

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •