what heads are the best
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what heads are the best

  1. #1
    Senior Member eddiedowey's Avatar
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    Default what heads are the best

    ok
    I'm building a 572 bbc 8 to 1 pistons
    solid roller 758 lift 114 lobe separation.
    I want to buy a set of heads but before I do I thought
    I would get some opinions . I called brodix and ask what
    their thoughts were. they said to use bb3 xtras.
    I know there are alot of knowledge on this forum .
    any help out there
    this motor is going in my hydro
    thanks

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  3. #2
    Senior Member Not So Fast's Avatar
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    Senior Member Filucky's Avatar
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    Quote Originally Posted by eddiedowey View Post
    ok
    I'm building a 572 bbc 8 to 1 pistons
    solid roller 758 lift 114 lobe separation.
    I want to buy a set of heads but before I do I thought
    I would get some opinions . I called brodix and ask what
    their thoughts were. they said to use bb3 xtras.
    I know there are alot of knowledge on this forum .
    any help out there
    this motor is going in my hydro
    thanks
    Is this a N/A motor, If so why the low CR? You could go 10.5:1 cr on pump gas, also you need your heads flow #'s before you pick a cam, you'll get better results that way. If you give alot more info about your motor, boat and intended use that would help alot.
    Nice!

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    Senior Member steveo143's Avatar
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    My 621 BBC is getting Brodix BB4 Xtras. Trick Flow 360's are pretty darn nice too!
    steveo143 AKA DiMarco 21 II



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  7. #5
    gn7
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    Sounds like a blower motor. 8 to 1, 114 lsa.
    No duration numbers on the cam.
    No mention of the inductrion system
    I'm thinking one its 650 on a dual plane so 049's with over sized valves should be perfect.

    Thats all the info you gave Brodix and they were ableto tell you BB3xtra. There went the very last bit of respect I had for Bordix. Which wasn't much to start with.



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    Last edited by gn7; 12-23-2010 at 02:58 PM.

  8. #6
    Senior Member eddiedowey's Avatar
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    Default heads

    somehow I left out the blower bds 871
    the cam is a lunati solid roller
    758 lift
    264 in
    280 ex
    114 lobe sep

  9. #7
    Senior Member eddiedowey's Avatar
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    Default heads

    when I said heads
    I meant what cc chambers
    what cfm"s too.

  10. #8
    Senior Member EVILFORCE's Avatar
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    Quote Originally Posted by eddiedowey View Post
    when I said heads
    I meant what cc chambers
    what cfm"s too.
    Here is a number. 118-123 cc's. 335-360 cfm.
    No Fool Like A Old Fool is there?

  11. #9
    gn7
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    I'm so lost I don't know where to begin. How do you know what your compression ration is if you don't know what CC your chambers are.

    Do you know what you want your compression to be. Do you know the dish size of the pistons you have and the distance in or out of the hole?
    Have you bought any of this stuff, or is the stuff you want to buy.



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  12. #10
    Senior Member Filucky's Avatar
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    Personally, i'd throw a set of CNC'd Big Chiefs on it and call it a day.
    Nice!

  13. #11
    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by gn7 View Post
    I'm so lost I don't know where to begin. How do you know what your compression ration is if you don't know what CC your chambers are.

    Do you know what you want your compression to be. Do you know the dish size of the pistons you have and the distance in or out of the hole?
    Have you bought any of this stuff, or is the stuff you want to buy.
    X2 He's brought up all excellent point of info any good builder would ask

    I always like to know the application it will be used in

    What type of boat, size, drive, gears,exhaust and intake, prop and weight

    After picking the right comb parts. Just like buying a good suit

    the final fitting starts
    If you ain't the lead dog the view is always the same !

  14. #12
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    Default Bb3 xtra

    Quote Originally Posted by eddiedowey View Post
    ok
    I'm building a 572 bbc 8 to 1 pistons
    solid roller 758 lift 114 lobe separation.
    I want to buy a set of heads but before I do I thought
    I would get some opinions . I called brodix and ask what
    their thoughts were. they said to use bb3 xtras.
    I know there are alot of knowledge on this forum .
    any help out there
    this motor is going in my hydro
    thanks
    I ran a set of cnc bb3 xtras on my 572 last summer. They were 355/119s. Compression was 10.4, cam was .714I, .690E. Any way the motor made 837 at 6300 without a perfect tune. I know this may not have much to do with your blower motor but they made good power on my 572. Brodix also stated that they were borderline of being too big for my 572 at 6300.

  15. #13
    gn7
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    Quote Originally Posted by jungledave View Post
    I ran a set of cnc bb3 xtras on my 572 last summer. They were 355/119s. Compression was 10.4, cam was .714I, .690E. Any way the motor made 837 at 6300 without a perfect tune. I know this may not have much to do with your blower motor but they made good power on my 572. Brodix also stated that they were borderline of being too big for my 572 at 6300.
    This why I hate Brodix heads. Everything I look at says the 3xtra cnc is a 366 cc intake. What can be really confusing is when the CCs are less on the cnc heads than the as casts. Like the 2xtra as cast is 365, but the cnc is 355
    Not counting the fact that each series head requires its own dedictaed shaft rocker stands.

    Jungledave, are you sure yours are 3s or that the CCs are 355?



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    Last edited by gn7; 12-27-2010 at 06:55 PM.

  16. #14
    Senior Member MACHINEHEAD1's Avatar
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    The first flag is the 8-71 on 572 inches. Going to take some decent over drive with a real good set of heads and a cam of that size. Did a dumb test one time and found it took about 3.0 lbs to break even on a 9.1 555 incher with a 10-71. Sounds like this will be pump gas. Its probably going to need 9-11lbs of shitty air with the 8-71 to make 950 hp. That spinnin the 8 pretty hard

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