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Thread: Which Cometic Head Gaskets for 5.3

  1. #1
    Join Date
    Aug 2010
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    Which Cometic Head Gaskets for 5.3

    Im going to be installing a set of P/P 243 heads milled .040 on my stock 5.3l bottom end ,to run while i build the LQ9.

    Cam is a Lunati voodoo 222/228 .567/.567 113 + 4

    I want to run a set of thin Cometic head gaskets...what part number do i need?
    The smallest bore size i seen was a 3.910" is that ok to run a standard 5.3l bore?

    99 4x4 5.3 NELSON TUNED / 02 Ls1 CAM / 02 Ls1 "241 Heads" Port/Polish milled .045" / 03 INJECTORS / AIR RAID JR. INTAKE / PORTED THROTTLE BODY / TR55's / EGR DELETE / E FAN's / CAT DELETE / EXHAUST DUMPED

    Headers, Transgo HD2, 3200 stall, 4.56 gears coming soon.....

  2. #2
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    I may be totally wrong, but I don't see why not. They have the same bore centers...I very well could be wrong though. Maybe someone else will chime in
    2007 RCSB|DTR81 built LSx 3xx|PRC|NX|BOGART|MSD|QUICKFUEL 950 E85|4L80|FTI Converters|Smith RaceCraft|Racepak
    midweststreetcars.com

  3. #3
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    GM replacements are the same between the 5.3 and the 5.7, look at your old ones they should have 5.3/5.7 marked on them towards the rear if I remember right.
    2006 Silverado
    Little Black Bitch

  4. #4
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    Quote Originally Posted by Frenchy View Post
    GM replacements are the same between the 5.3 and the 5.7, look at your old ones they should have 5.3/5.7 marked on them towards the rear if I remember right.
    Mine only said 5.7 but they were the exact same size as the stock ones I took off.
    T-RAV
    99 GMC | 5.3 | Skinny White Guy Tuned

  5. #5
    Join Date
    Aug 2010
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    Thanks for the info gents! Just wanted to make sure before i dropped the coin on them.

    99 4x4 5.3 NELSON TUNED / 02 Ls1 CAM / 02 Ls1 "241 Heads" Port/Polish milled .045" / 03 INJECTORS / AIR RAID JR. INTAKE / PORTED THROTTLE BODY / TR55's / EGR DELETE / E FAN's / CAT DELETE / EXHAUST DUMPED

    Headers, Transgo HD2, 3200 stall, 4.56 gears coming soon.....

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