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Different Heads

This is a discussion on Different Heads within the Internal Engine forums, part of the LSx Technical Help Section category; Can someone tell me whats the different between the 5.3, LS6, L92 heads....

  1. #1
    Devil Dog therel82's Avatar
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    Different Heads

    Can someone tell me whats the different between the 5.3, LS6, L92 heads.
    1999 Trans Am, 333rwhp/345rwqt

  2. #2
    Wants to be Snowboarding FuhBreezeE's Avatar
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    .100
    72 cfm
    65 cfm

    .200
    140 cfm
    124 cfm

    .300
    202 cfm
    160 cfm

    .400
    244 cfm
    196 cfm

    .500
    280 cfm
    220 cfm

    .550
    291 cfm
    226 cfm

    .600
    304 cfm
    229 cfm


    100
    67 cfm
    61 cfm

    .200
    133 cfm
    108 cfm

    .300
    194 cfm
    147 cfm

    .400
    242 cfm
    183 cfm

    .500
    274 cfm
    205 cfm

    .550
    290 cfm
    213 cfm

    .600
    296 cfm
    220 cfm

    Top specs are from Ls6
    Bottom set from the 5.3
    Correct me if I'm wrong, but it's just a bigger cfm.

  3. #3
    Senior Member Bottesini's Avatar
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    Here are some specs if you look around you should find what you need. A bit more difference between the heads then just flow rates.

  4. #4
    Firebird Encyclopedia 9T8W66's Avatar
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    Try a search

    But in a nutshell
    The 5.3's are identical to LS1 heads except smaller chamber and valves
    LS6 heads are a tuned up version of the LS1 head for better performance.
    And the L92/LS3 head is the new Gen IV rectangular port head that out flows even the best aftermarket stuff. But won't work on LS1's
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  5. #5
    Devil Dog therel82's Avatar
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    Quote Originally Posted by 9T8W66 View Post
    Try a search

    But in a nutshell
    The 5.3's are identical to LS1 heads except smaller chamber and valves
    LS6 heads are a tuned up version of the LS1 head for better performance.
    And the L92/LS3 head is the new Gen IV rectangular port head that out flows even the best aftermarket stuff. But won't work on LS1's
    okay thanks man, so if I wnat an head upgrade then I should buy the LS6 right from what your saying.

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    Senior Member M-Ten's Avatar
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    hmm glad you asked this, i was curious too

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    Veteran 0rion's Avatar
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    Quote Originally Posted by therel82 View Post
    okay thanks man, so if I wnat an head upgrade then I should buy the LS6 right from what your saying.
    that's the most popular way of going. The 5.3 heads offer a bump in compression but you can get that by milling the LS6 heads also.

  8. #8
    Senior Member M-Ten's Avatar
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    what's the diff between the 1.0 LS6 heads and 2.5 LS6 heads?

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    2002 Trans am WS6 T-top

    That depends if you are buy a real cheap set of ls6 heads or going aftermarket pp stage2 5.3 heads. Check thunder hill racing and patriot performance.

  10. #10
    Senior Member M-Ten's Avatar
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    but according to previous posts the LS6 heads flow better than the 5.3

    and they have 2 options of LS6 heads : 1.0 and 2.5

  11. #11
    Veteran 0rion's Avatar
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    if you compare patriots listed numbers. Stage 2 5.3 heads flow 296 at .600 and stage 2 LS6 heads flow 304 at 600.
    those are both with 2.02 intake valves. The stage 2.5 5.3 heads have 2.04 valves. I'm not sure how much extra flow the larger valves are worth but probably not a ton. Probably make them comparable to the LS6 heads with the 2.02's.

  12. #12
    Senior Member M-Ten's Avatar
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    what about the stage 3 ls6 ? those seem to flow the best?

    sorry don't know much about heads/cams at all..

  13. #13
    Veteran 0rion's Avatar
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    If you notice the bore size went up also. Just my personal opinion but if you want a good head just stick to the LS6 stage 2's. I also don't think there's a really huge difference between those and stage 2.5 5.3L heads. That's opinion of course.

  14. #14
    Senior Member M-Ten's Avatar
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    Ok, I guess when it comes time to do heads/cam package i'll just ask them on the phone thanks for the info though

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    Senior Member Bottesini's Avatar
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    I would do alot more then that, ask around and talk to lots of people, and don't forget to try to read as much about them as you can. Heads and cams can be intimidating at first, but eventually if you dive into the information and try to understand it will be easier to understand and you will end up getting something closer to what you want.

  16. #16
    Veteran 0rion's Avatar
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    I agree. Ask as many people as you can and make sure you have an understanding of what you're getting before you get it. I see that happen with cams. People just sorta go with the flavor of the month and when they get it they're disappointed. Bigger is not always better. You need to pick the setup that suites what you want out of the car and what works for you. If you put miles on the car and do a lot of stop and go traffic then a 248 duration cam with .6xx lift on a 110 lsa probably isn't what you're looking for.

  17. #17
    Senior Member M-Ten's Avatar
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    Well as far as the cam goes, from what I've read I want a 228 with 112 lsa.. i drive the car everyday... and I know they have heads and cams packages, I figured if I were to ask them waht heads they would recommend for that particular cam they would point me in the right direction

  18. #18
    Veteran 0rion's Avatar
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    or they'll point you to whatever they have in stock. Maybe not true but just making a point. It's always best to know what you want going in and have an understanding of why you want it.

  19. #19
    Senior Member M-Ten's Avatar
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    Yeah you're right, it's gonna be a few months before I start thinkin about gettin them though, so I have some time

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