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  1. #1
    LTX Member


    Status
    Offline
    Join Date
    Mar 2020
    Name
    Sam
    Vehicle
    1994 Firebird Trans Am
    Posts
    4

    Default Gains from porting the welds on Pacesetter headers

    Has anyone ever measured the gains from porting the inside of the welds between the flange and primary runners?

    I decided to clean up my pacesetter headers cause it looked pretty restrictive. These worked great for years on my stock LT1 but since they are going back onto a 383 LT1 I am looking to maximize the performance. I don't feel worried about the material removal since the welds seemed to have good penetration. So far I've done 3 of 8. For reference these are 1-3/4 primaries and 3" collector.

    IMG_6468.JPGIMG_6464.JPGIMG_6467.JPGIMG_6466.JPGIMG_6465.JPG
    '94 Trans Am LE2 HCI, 383 11.24:1 forged Eagle crank 6" H-beam rods, Mahle pistons, ATI damper, Moroso 7qt pan, 36lb/hr injectors, Pacesetter LT headers, 3" x-pipe + dumps, SLP CAI, EWP, Strange 12 Bolt posi 4.11, Stage 2 T56, McLeod StreetPro

  2. #2
    10 Second N/A Club


    Status
    Offline
    Join Date
    Sep 2008
    Name
    Josh
    Vehicle
    96 Z28
    Location
    Holden, MO (KC)
    Posts
    2,842

    Default

    I opened up the welds on mine when I had Pacesetters, I don't know if it made any difference but I figured it couldn't hurt. Some of the weld was pretty restricting or at least it appeared to be.
    -Josh
    co-owner of BDBRacing.com
    NMCA OC 9004
    96, N/A 385, Holley EFI, Faceplated M6, AI TFS heads, LE SR cam, MWC Fab 9
    10.57 @ 130 1.60 60'........still workin on that 60' shootin for 1.4's!

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