Page 2 of 3 FirstFirst 123 LastLast
Results 21 to 40 of 55

408cid cam

This is a discussion on 408cid cam within the Internal Engine forums, part of the LSx Technical Help Section category; I run nothing but 91 octane. Compression is 11:1....

  1. #21
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    I run nothing but 91 octane. Compression is 11:1.

  2. #22
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    Quote Originally Posted by Mr. Luos View Post
    I run nothing but 91 octane. Compression is 11:1.
    Wow, I didnt know that you could run 91 Octane at that high of a compression. What is the cut off with the 91 octane and the compression?

  3. #23
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    With the LSx series aluminum heads...it depends on the timing you run, but 11.5:1 is starting to push it.

  4. #24
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    That is good to know thanks for the wisdom. Does it matter if you have a Iron block or not when talking about compression and the gas you can run? Cause the heads will still will be alluminum.

  5. #25
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    I am sure the iron effects it slightly. It is mostly in the heads though. The valve angle of the LSx head and the fact that they are aluminum allow for more compression on pump gas.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

  6. #26
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    Quote Originally Posted by Mr. Luos View Post
    I am sure the iron effects it slightly. It is mostly in the heads though. The valve angle of the LSx head and the fact that they are aluminum allow for more compression on pump gas.
    Thats what I thought with the heads, minus the valve angle, I just wasn't sure about the fact that the iron block will be hotter than the aluminum block and how much that would play into the affect on the heat on the aluminum heads affecting the compression.

  7. #27
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    Quote Originally Posted by Mr. Luos View Post
    I am sure the iron effects it slightly. It is mostly in the heads though. The valve angle of the LSx head and the fact that they are aluminum allow for more compression on pump gas.
    I know you run the fast 90 manifold, but do you think with the 408 that we have talked about that im going to be running do you think i can run the bread basket intake or is that to much flow? here is the link to the idea I was talking about...http://www.spectrum5racing.com/

  8. #28
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    Quote Originally Posted by Mr. Luos View Post
    I am sure the iron effects it slightly. It is mostly in the heads though. The valve angle of the LSx head and the fact that they are aluminum allow for more compression on pump gas.
    I know you run the fast 90 manifold, but do you think with the 408 that we have talked about that im going to be running do you think i can run the bread basket intake or is that to much flow? here is the link to the idea I was talking about...http://www.spectrum5racing.com/
    http://www.beckmechanical.com/intakes/sam.htm

  9. #29
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    You know...a ported FAST works really well on the strokers.
    Those sheet metal ones have heat issues, and are better suited for boosted applications. At least from what I have seen.

    I hear there are a couple more large intakes coming out in the spring. If I remember right, FAST is releasing one as well. I might look into it myself.

  10. #30
    Member krusemj's Avatar
    Join Date
    Apr 2006
    Location
    where ever the army wants me to be
    Age
    37
    Posts
    159

    artic white
    2001 WS6 Trans Am

    Hey Mr. Luos what are you running as far as a fuel system. I am in the process of my 408 build as well
    “The democracy will cease to exist when you take away from those who are willing to work and give to those who would not.”
    Thomas Jefferson

  11. #31
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    Mostly stock replacement.
    42# injectors, Racetronix single 255lph kit.

  12. #32
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    Quote Originally Posted by Mr. Luos View Post
    You know...a ported FAST works really well on the strokers.
    Those sheet metal ones have heat issues, and are better suited for boosted applications. At least from what I have seen.

    I hear there are a couple more large intakes coming out in the spring. If I remember right, FAST is releasing one as well. I might look into it myself.
    Yea from what I heard it is suppose to be a 96mm throttle body...

  13. #33
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    Quote Originally Posted by Mr. Luos View Post
    Mostly stock replacement.
    42# injectors, Racetronix single 255lph kit.
    So you did need to replace your injectors from stock? Can the stock injectors work on my 408 or will they not flow enough? and did you use your stock ls1 oil pump? cause one guy on the forum told me dont use your stock ls1 oil pump...

  14. #34
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    I got a ported LS6 oil pump.
    Stock injectors might work at maximum duty cycle at this altitude. I did it just in case.

  15. #35
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    Quote Originally Posted by Mr. Luos View Post
    I got a ported LS6 oil pump.
    Stock injectors might work at maximum duty cycle at this altitude. I did it just in case.
    Where did you pick up the oil pump from and about how much should I expect to pay? Did you get it through TSP? or Summit?

  16. #36
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    LPE if I recall.
    $130'ish'

    TSP has a good one as well. $139.99


    And Thunder (as they are a sponsor)
    http://www.thunderracing.com/catalog...&vid=3&pcid=83

  17. #37
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    Quote Originally Posted by Mr. Luos View Post
    LPE if I recall.
    $130'ish'

    TSP has a good one as well. $139.99


    And Thunder (as they are a sponsor)
    http://www.thunderracing.com/catalog...&vid=3&pcid=83
    Thanks man, where did you get your gasket set through, cause I am having a TIME trying to get a complete ls1 gasket set....?

  18. #38
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    Mostly from a stealership.

    My head gaskets are Cometic's though.

  19. #39
    I Like It Stroked 99Ls1fever's Avatar
    Join Date
    Aug 2007
    Location
    Greeley,Co
    Posts
    1,006

    Artic White
    1999 Z28 408 Stroker M6

    Cool, Cool... Why did you decide to go with bigger injectors? Is it cause stock as you said would have to perform at max potiential? and or cause the stocks just can't due the job correctly anymore? And since my friend is here he wanted me to also ask you if you had to upgrade your fuel pump also?

  20. #40
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    The Racetronix kit comes with a Walbro 255lph fuel pump.
    I knew I would be pushing the limits of the stock injectors, so I went ahead and bought larger ones.

Page 2 of 3 FirstFirst 123 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

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