Results 1 to 5 of 5

FAST manifold on a 408

This is a discussion on FAST manifold on a 408 within the Firebird / WS6 forums, part of the Vehicle Specific category; Does anyone have any dyno charts of how much they gained going from an LS6 to a FAST on a ...

  1. #1
    Member 408WS6's Avatar
    Join Date
    Jan 2006
    Location
    Houston
    Age
    50
    Posts
    401

    Current best: 10.60/126.8
    1998 Pontiac TA WS6

    FAST manifold on a 408

    Does anyone have any dyno charts of how much they gained going from an LS6 to a FAST on a 408 (or a 402)? Any noticeable difference? Any track time improvements?

    I'm trying to decide on whether or not to upgrade my LS6 to a FAST. The FAST should help out the larger displacement motors more, but I haven't seen any comparisons yet. I've seen plenty of comparisons between the intakes on 5.7L motors, but none on the larger displacement motors.

  2. #2
    your parts guy!!! 1fastcamarosss11's Avatar
    Join Date
    Aug 2005
    Location
    cleveland ohio
    Posts
    11,376

    trans am 00 ws6
    1998 camaro ss vert

    better off getting the gm manifold very close to the same number as the 90 mm fast, at half the price.

  3. #3
    Member 408WS6's Avatar
    Join Date
    Jan 2006
    Location
    Houston
    Age
    50
    Posts
    401

    Current best: 10.60/126.8
    1998 Pontiac TA WS6

    Quote Originally Posted by 1fastcamarosss11 View Post
    better off getting the gm manifold very close to the same number as the 90 mm fast, at half the price.

    What do you mean GM manifold? I already have the LS6 manifold. If you are refering to the LS7 manifold, that option is out because they won't work with the AFR heads that I have.

  4. #4
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    The FAST outflows the LS6 intake by a good amount.

    But most motors can't take in that extra flow anyways. I would think the FAST would be worth 10-15 RWHP over the LS6 intake on a H/C 402/408.
    I do not have any proof on it though.

  5. #5
    Senior Member MadSeason's Avatar
    Join Date
    Aug 2005
    Location
    Indiana
    Age
    35
    Posts
    2,000
    1994 POS

    Quote Originally Posted by 408WS6 View Post
    Does anyone have any dyno charts of how much they gained going from an LS6 to a FAST on a 408 (or a 402)? Any noticeable difference? Any track time improvements?

    I'm trying to decide on whether or not to upgrade my LS6 to a FAST. The FAST should help out the larger displacement motors more, but I haven't seen any comparisons yet. I've seen plenty of comparisons between the intakes on 5.7L motors, but none on the larger displacement motors.
    on another board there's been compairsons that show as long as the cam has a nice intake duration it can fully take advantage of the 90 for 15-25rwhp, also having FI of some sort helps too.. Luos i'm surprised you're not using a 90 to get more o2 in that thing up in the mts

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. FAST 78mm Manifold
    By ChiGTO in forum Parts Wanted / Trade
    Replies: 1
    Last Post: 03-28-2010, 06:17 PM
  2. FAST LSX manifold?
    By KnightmareWS6 in forum External Engine
    Replies: 8
    Last Post: 03-17-2010, 07:21 AM
  3. WTB: FAST 78mm Manifold
    By Pedal-2-Metal in forum Parts Wanted / Trade
    Replies: 5
    Last Post: 02-03-2010, 07:44 PM
  4. FAST vs LS6 Intake Manifold?
    By StylesMcKnob in forum Internal Engine
    Replies: 26
    Last Post: 06-05-2007, 06:46 PM
  5. LS6 vs Fast LSx intake manifold
    By djvaly in forum Firebird / WS6
    Replies: 12
    Last Post: 11-21-2006, 11:11 PM

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
  •