489 bbc ignition timing?
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489 bbc ignition timing?

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    Senior Member holorinhal's Avatar
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    Default 489 bbc ignition timing?

    I am looking for a starting base line for Ignition timing on My 489cid bbc. i am running a MSD ready to run dizzy and timing is not locked out.

    I just want a place to set it now while i can run it on the trailer and test and tune on the water. Once I insall the pump I will not be able to play with it on the trailer, With out the headache of disconecting the drive line.

    I'm not here for a long time, I'm just here for a good time!
    If your not on the edge.......your taking up too much room......Drive it like you stole it!

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    Senior Member vee-driven's Avatar
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    36 degrees full advance


    It's not that i don't care, I just dont give a sh!t!

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    gn7
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    I have a 489 with iron headed closed chamber heads, a tiny ass 256* @ .050, 12.5 to 1 pistons and run it on 87 octane. Do you think that 36* totall will work for me as well?



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    Quote Originally Posted by gn7 View Post
    I have a 489 with iron headed closed chamber heads, a tiny ass 256* @ .050, 12.5 to 1 pistons and run it on 87 octane. Do you think that 36* totall will work for me as well?
    Splain it BOB...please I know you can...
    Last edited by mdsheppie; 07-12-2011 at 07:19 PM.

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    Senior Member holorinhal's Avatar
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    Quote Originally Posted by gn7 View Post
    I have a 489 with iron headed closed chamber heads, a tiny ass 256* @ .050, 12.5 to 1 pistons and run it on 87 octane. Do you think that 36* totall will work for me as well?
    gn7 will You elaborate. I am just looking for a place to start. A place to set it before I get to the lake. Its a fresh motor and has not been on the water Yet.

    I'm not here for a long time, I'm just here for a good time!
    If your not on the edge.......your taking up too much room......Drive it like you stole it!

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    gn7
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    Explain what? I'm the one asking the question. I need the explanation



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    Senior Member EVILFORCE's Avatar
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    Hi Bob.









    No Fool Like A Old Fool is there?

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    gn7
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    Quote Originally Posted by holorinhal View Post
    gn7 will You elaborate. I am just looking for a place to start. A place to set it before I get to the lake. Its a fresh motor and has not been on the water Yet.
    I can't give you a place to start. Now if your just trying to light it off in the drive, 28 works no different than 38. Once you set the idle, I doubt you could tell the difference between the two. But if your looking for a setting to run on the water as a starting point, the fuel octane, manifold/carb(s), cam, head type(open/closed) material iron/alum are alll things you kind of need to know to make a reasonable intelligent guesstament



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    Senior Member holorinhal's Avatar
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    Quote Originally Posted by gn7 View Post
    Explain what? I'm the one asking the question. I need the explanation
    What are Your thoughts on a starting point?
    Last edited by holorinhal; 07-13-2011 at 03:19 PM.

    I'm not here for a long time, I'm just here for a good time!
    If your not on the edge.......your taking up too much room......Drive it like you stole it!

    73 KONA Restoration http://www.performanceboats.com//showthread.php?t=10678
    '81 Spectra 20 Facelift http://www.performanceboats.com/user...-facelift.html

    18' Advantage http://www.performanceboats.com/jet-...k-project.html

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    Senior Member holorinhal's Avatar
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    Quote Originally Posted by gn7 View Post
    I can't give you a place to start. Now if your just trying to light it off in the drive, 28 works no different than 38. Once you set the idle, I doubt you could tell the difference between the two. But if your looking for a setting to run on the water as a starting point, the fuel octane, manifold/carb(s), cam, head type(open/closed) material iron/alum are alll things you kind of need to know to make a reasonable intelligent guesstament
    489 C.I.D.BBC Full roller.

    .030" over bore

    Scatt 4340 forged crank,4.25" stroke

    Splayed main caps /w ARP main studs

    Eagle, 6.135" forged H beam rod's

    SRP forged pistons, 17.00cc dome
    Block,zero decked

    Bullet roller cam, duration- in. 264/ex 273 @.050, lift - int .720/ex .710, 108 seperation

    Morel pressure fed solid roller lifters

    Cloyes hexadjust double roller timming set

    AFR 325cc aluminum heads, milled, .030 for compression bump

    Crane gold rockers,1.8 int.,1.7 ex

    Edelbrock TR2 tunnelram

    two 600 cfm holley carbs

    100 OCTANE

    Any thing else? Oh yea Here is the cam card.

    Last edited by holorinhal; 07-12-2011 at 08:18 PM.

    I'm not here for a long time, I'm just here for a good time!
    If your not on the edge.......your taking up too much room......Drive it like you stole it!

    73 KONA Restoration http://www.performanceboats.com//showthread.php?t=10678
    '81 Spectra 20 Facelift http://www.performanceboats.com/user...-facelift.html

    18' Advantage http://www.performanceboats.com/jet-...k-project.html

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    Senior Member holorinhal's Avatar
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    No skiing or tubeing, jet boat ,73 kona, friendly river racing.
    Last edited by holorinhal; 12-27-2014 at 07:11 PM.

    I'm not here for a long time, I'm just here for a good time!
    If your not on the edge.......your taking up too much room......Drive it like you stole it!

    73 KONA Restoration http://www.performanceboats.com//showthread.php?t=10678
    '81 Spectra 20 Facelift http://www.performanceboats.com/user...-facelift.html

    18' Advantage http://www.performanceboats.com/jet-...k-project.html

  14. #12
    Senior Member MACHINEHEAD1's Avatar
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    Shorten the curve way up,like 22-24 intial and 34 total. Make a custom stop bushing if you have to. Or just lock it out and see how it starts. That combo will love 34 degrees locked. But for now I think there is 22-24 degrees built into that dist. so set it at 8-10 degrees initial. But its not going to idle well.

  15. #13
    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by holorinhal View Post
    489 C.I.D.BBC Full roller.

    .030" over bore

    Scatt 4340 forged crank,4.25" stroke

    Splayed main caps /w ARP main studs

    Eagle, 6.135" forged H beam rod's

    SRP forged pistons, 17.00cc dome
    Block,zero decked

    Bullet roller cam, duration- in. 264/ex 273 @.050, lift - int .720/ex .710, 108 seperation

    Morel pressure fed solid roller lifters

    Cloyes hexadjust double roller timming set

    AFR 325cc aluminum heads, milled, .030 for compression bump

    Crane gold rockers,1.8 int.,1.7 ex

    Edelbrock TR2 tunnelram

    two 600 cfm holley carbs

    100 OCTANE

    Any thing else? Oh yea Here is the cam card.

    Nice Job

    I see you put a few bucks in that,but I would spend a little more

    If you have a chance to run it on the dyno, I would for peace of mind

    I would start at 34 make a couple pulls check the jetting and recheck the valve settings

    And add a degree of timing at a time and watch the dyno #

    Good luck with your project
    If you ain't the lead dog the view is always the same !

  16. #14
    Senior Member jimclauss's Avatar
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    Quote Originally Posted by holorinhal View Post
    I am looking for a starting base line for Ignition timing on My 489cid bbc. i am running a MSD ready to run dizzy and timing is not locked out.

    I just want a place to set it now while i can run it on the trailer and test and tune on the water. Once I insall the pump I will not be able to play with it on the trailer, With out the headache of disconecting the drive line.
    gas or alcohol? blown or normally aspirated? put it on a dyno. you won't be sorry
    Last edited by jimclauss; 07-12-2011 at 09:29 PM.

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