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how much h/p will I gain from 241 to 243 Cylinder head ??

This is a discussion on how much h/p will I gain from 241 to 243 Cylinder head ?? within the Internal Engine forums, part of the LSx Technical Help Section category; Just like the title says, How much more h/p gain will I have on my car if i install 03 ...

  1. #1
    o4goatman
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    red
    04 gto A/T

    how much h/p will I gain from 241 to 243 Cylinder head ??

    Just like the title says, How much more h/p gain will I have on my car if i install 03 zo6 243 stock heads to my gto. See below on current moda.
    How much addt'l h/p can I expect if i get the heads ported ?

  2. #2
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    Pewter
    2002 Trans am WS6 T-top

    Are you keeping the cam as is? Just the ported head swap for now?
    Since you own a 04 ls1, is the 05 model (6.0L) have the 24x crank sensor wheel or is it the 54x wheel? Just curious to ask a Goat owner. I really like those vehicles. I would not mind owning a larger coupe w/ heavy duty suspension. (nice comfortably seats)

  3. #3
    o4goatman
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    04 gto A/T

    Quote Originally Posted by tylerdurden1 View Post
    Are you keeping the cam as is? Just the ported head swap for now?
    Since you own a 04 ls1, is the 05 model (6.0L) have the 24x crank sensor wheel or is it the 54x wheel? Just curious to ask a Goat owner. I really like those vehicles. I would not mind owning a larger coupe w/ heavy duty suspension. (nice comfortably seats)
    See my Signature for full the mods. I have comp cam 222/224 566/568 112lsa.
    Yes 05 has 6.0L motor vs 5.7L.

  4. #4
    Junior Member RedMetal's Avatar
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    Bright Rally Red
    01 Camaro SS M6

    If you are just make a swap from stock 241's to stock 243's then 15-20rwhp would be a "safe" expectation..... maybe use a cometic gasket set to get the CR up a bit and the quench better for some extra power.

  5. #5
    Member Kup98ss's Avatar
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    Arctic White
    2002 A4,WS6

    would those heads eat gas or be about the same?

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    Junior Member Eddie 70's Avatar
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    Quote Originally Posted by Kup98ss View Post
    would those heads eat gas or be about the same?
    I would think that it should not make much of a difference in gas mileage, if any at all. This is all dependent on your right foot of course.

  7. #7
    TunedbyFrost.com Tuner Frost's Avatar
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    20 to (believe it or not) 35rwhp with the cam and mods that you have already. I didn't tune the car that picked up the 35, but I saw it on tech with the graph. 20-25 is quite common though.

  8. #8
    o4goatman
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    04 gto A/T

    Quote Originally Posted by RedMetal View Post
    If you are just make a swap from stock 241's to stock 243's then 15-20rwhp would be a "safe" expectation..... maybe use a cometic gasket set to get the CR up a bit and the quench better for some extra power.
    Who sells the cometic & what is the cometic gasket size i can use to up the cr w/o having the ptv clearance ?

  9. #9
    Genital Salesmen WEZONIT's Avatar
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    2000 SS

    I will be using a Cometic .040 Gasket on the setup in my sig. That should put my compression somewhere around 10.9 -11.0 to 1. I bought everything from texas speed. Without a porting job I think you might see 15-25 RWHP with stock 243's.

  10. #10
    o4goatman
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    Quote Originally Posted by WEZONIT View Post
    I will be using a Cometic .040 Gasket on the setup in my sig. That should put my compression somewhere around 10.9 -11.0 to 1. I bought everything from texas speed. Without a porting job I think you might see 15-25 RWHP with stock 243's.
    The stock 243 head compression is 10.5:1, If i go go with the same cometic gasket as u that would give me same comprssion as yours. Base on my cam exhaust 566/568 i should be fine with the ptv clearance right Z?
    What came with the kit & how much is it ?

  11. #11
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    NBM
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    12-15hp would be pushing it.
    TSP 347 SB, TSP Stage 2.5 PRC LS6, TSP MS4, Performabuilt Stage 2 4L60E, Yank PT4000, 4.11s, Fast 90/90, FTRA Cold air intake+all the free mods, Dynatech Supermaxx Exaust System, DMH Cutouts, Hooker Catback/FTRA Tips. Tuned by RPM/Garner NC. 11.28@119

  12. #12
    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by PFM View Post
    12-15hp would be pushing it.
    maybe for an unlocked automatic... have seen (tuned) 26rwhp out of a used stock set (stock minus 918 springs) on an M6 car with a small cam, and 22rwhp out of an M6 with an intermediate sized cam (233ish intake 237ish exh). They have suprised me.

  13. #13
    Junior Member RedMetal's Avatar
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    01 Camaro SS M6

    I agree with Frost... I have seen more than once M6's picking up a solid 20rwhp with a small cam and tuned, and you can squeeze a little more out of it if you run the 0.040 cometic gasket kit as WEZONIT stated. That size cometic should give you an extra 0.30-0.40 boost in the CR results...10.8-10.9. If you have a little extra cash 100-200 bucks get them milled down to 61-62cc and use the cometic for a CR of around 11.3-11.4 which is easy to run on 93 octane.

    With that compression you could "probley" run a 228'ish .580/.580 112lsa..... but that is just a guess!! You need to talk with your shop/tuner.....

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