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Thread: heads

  1. 04-07-2010 10:14 AM #1
    blaksunshine
    blaksunshine is offline Junior Member
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    heads

    i couldnt find a thread about this. my 99 has a 5.3 that is getting ready for its new life. the local engine builder has a set of 243 heads ported and polished , valve job , and srings. these are off of a 6.0 so ive been told. the question is with the bigger valves willl they work on my 5.3 . i dont realy know why but i want to keep the 5.3. intake 2.02 and exhaust 1.64 is 3.68 my bore is only 3.78 which leaves .100 im not real sure of the valve spacing and dont want to buy them if they are not going to work
    Last edited by blaksunshine; 04-07-2010 at 10:18 AM. Reason: more info
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  2. 04-07-2010 11:43 AM #2
    6stringer
    6stringer is offline of the few lifted ones
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    243 will work fine but I'm pretty sure they need to be miled to get factory compression. But 6.0s never came with 243, they came with 317s
    Today 03:25 am 6 stringer o thats a good point, its ok ill just add a blinker fluid cooler
    Today 03:24 AMtruckinL33 that's not a good place for it, you can overheat your blinker fluid with the capacitor
    Today 03:23 AMtruckinL33 i need them for when i go back to 1985
    Today 03:23 AM6stringer i mounted my flux capacitor next to my blinker fluid resevoir
    Today 03:22 AMtruckinL33 me too, right next to my flux compasator!
    Today 03:22 AM6stringer hey gear oil needs to be cooled, i have front and rear diff coolers
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  3. 04-07-2010 01:13 PM #3
    blaksunshine
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    ok they did come off 6.0 i just got back from there he was unsure of the cast # he just thought 243 but they are off 6.0 . they are ported and polished 450.00 or same money to do my heads these are ones he did for customer that never got picked up. any suggestions buy heads or work mine . this is purely fo performance not worried about economy
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  4. 04-07-2010 01:16 PM #4
    RedHeartbeat
    RedHeartbeat is offline WTH JUST HAPPENED?
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    The 243s were on the GTO and Corvette LS2 6.0L engines.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  5. 04-07-2010 01:27 PM #5
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    WARLOCK
    WARLOCK is offline Speedy
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    If they are 317s and not 243s....say bye bye compression....lol
    2000 Silverado ECSB- 5.3 CAI, Pacesetter LTs, ORY- Pipe, Magnaflow XL, E-fan, Ported T/B , Nelson Tuned, Built 4l60e, Circle D Stall, 3.42s G80, 2-4 Drop, Hertz Highs, Rockford 501s

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  6. 04-08-2010 05:50 AM #6
    LS1GMCTruck
    LS1GMCTruck is offline Senior Member
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    Quote Originally Posted by RedHeartbeat View Post
    The 243s were on the GTO and Corvette LS2 6.0L engines.
    Yes, and they also came on the LS6 5.7 litre engines. Which were the first engines to have them, from GM.
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  7. 04-08-2010 02:44 PM #7
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    f4tal
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    Greg and ^^ this guy are right!

    honestly the 862's flow great already... however if i were going to pay 450 for P&P of the 862's or 450 for the P&P'd 317s i would take the 317's any day... just mill them down some to get the comp back up and it will work great!
    Alex

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    03 GMC RCSB 5.3L CAI,Tune,3/6 drop
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  8. 04-09-2010 12:17 PM #8
    blaksunshine
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    thanx for the input guys
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