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98 up LS1 Camaro motor W/243 heads

This is a discussion on 98 up LS1 Camaro motor W/243 heads within the General Help forums, part of the LSx Technical Help Section category; I bought a new set of LS2 heads stock my question is what would I have to change to stay ...

  1. #1
    Junior Member
    Join Date
    Oct 2007
    New York

    55 F100

    98 up LS1 Camaro motor W/243 heads

    I bought a new set of LS2 heads stock my question is what would I have to change to stay as close to stock as possible with installing 243s on an LS1 block and how much HP and Torque would I gain.My other question is will this help or hurt my gas mileage.I know the last question is foolish to ask on this forum but I am a newbie and thick skined so fire away

  2. #2
    Veteran 0rion's Avatar
    Join Date
    Aug 2005

    98 Formula
    06 duramax

    I don't really follow what you're asking here so I'm gonna just give a broad answer and hopefully it'll help you. If not the ask a little more specific question.
    243's will outflow your current stock heads but not by leaps and bounds until they're ported and polished. You will see a few more HP by just bolting up the 243's but if I were guessing I'd say less than 20. Gas mileage will probably be pretty close to the same.

  3. #3
    King 0f n00bz shady milkman's Avatar
    Join Date
    Jan 2006
    Shepherd, Michigan

    blacker than wesleysnipes
    98' trans am

    ^ with him...243s out of a ls2 will not have the lightweight valves or "yellow" springs that the ls6 243s without those you will lose out on some power...but besides that..243s are a direct bolt on so there is basically nothing to mod ...the 243s where designed for the ls6 which was the performance version of the ls1. with the bolt dimensions being the same..the 243s will bolt right is best that you put a ls6 intake or fast 92 on there for increased gains.

    as the honorable Orion said..your gains will not be that great with a stock casting 243 compared to your stockers on should send your heads into a reputable shop that does P&Ps gen III+ heads and really see them shine.

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