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Header size 1 3/4" or 1 5/8"

This is a discussion on Header size 1 3/4" or 1 5/8" within the External Engine forums, part of the LSx Technical Help Section category; What header size are most of u using? My mechanic friends say that 1 5/8 is sufficient unless you have ...

  1. #1
    Junior Member
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    97 firebird WS6

    Question Header size 1 3/4" or 1 5/8"

    What header size are most of u using? My mechanic friends say that 1 5/8 is sufficient unless you have serious motor mods. They said 1 3/4 for a car w/ bolt ons won't be as good. What's your opinion?

  2. #2
    Member C&Cbird's Avatar
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    1998 Trans Am

    Most cars are using 1 3/4

  3. #3
    Member Sunset T/A's Avatar
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    Sunset Orange
    2002 TransAm

    1 3/4"

  4. #4
    Member chieftransam's Avatar
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    2001 Pontiac Trans Am M6

    1 3/4

  5. #5
    Slow'er'Ass Mr. Luos's Avatar
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    2008 Trailblazer SS

    Most aftermarket longtubes for the LT1 and LS1 motors are 1 3/4" primaries.

  6. #6
    Member jag42420's Avatar
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    2002 WS6 Trans Am

    Pacesetters are the most common LS1 headers, and they only come in 1 3/4" (longtube).
    2002 WS6 Trans Am, A4, SLP lid, P&P TB, 3500 stall, 24K GVW tranny cooler, HPTuners, Pacesetter LTs, Bassani dual exhaust with 'x' crossover, coolant bypass, sealed airbox to hood.

    http://www.cardomain.com/id/jag42420

  7. #7
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    2000 TransAm WS6

    Yea 1 3/4 is the way you want to go, even if its your only mod. I have 1 7/8 and I have a friend that has 2"
    now our motors our bigger cubes but 1 3/4 is what you need!
    Mike Berry
    2000 TransAm WS6 A4
    ASC#6552

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