Which Cam?
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Which Cam?

  1. #1
    Senior Member lbhsbz's Avatar
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    Default Which Cam?

    Engine:

    10.5:1 496 chev., SRP pistons, 6.385 rods, single 1050 carb, Dart 310 heads...what cam should I run? As much as I'd like to call chris and have him grind me one...that's not in the budget right now.

    I've got 2 sitting on the shelf.

    Cam #1:

    .672 lift (in & ex), 306°/312° adv., 266°/272° @ .050, 112° LS.

    Cam #2: Lift
    In - .706
    Ex - .697
    Duration
    In - 268° @ .050
    Ex - 275° @ .050
    Lobe Sep - 109°
    Intake Cent. - 105°

    One cam is going into my old motor to get sold, the other is going in a fresh one for the new float.


    Additionally, There's a lot of room on these heads to play with compression...so I was gonna try and find the closest thing to a flat top I could find and mill the heads to get to my compression mark.....or shoudl I leave the heads alone and put some decent domes in there. Does it matter? I always figured flatter pistons required less timing and should make more power without having to chase the flame around the dome.

    This is for a Jet boat...Cam number one in a 10.5:1 489 w/ 2 660s on a TR and ported 990 heads turned a A/B to 6000-6100. I'd like to do better than that on this new motor.
    Last edited by lbhsbz; 07-31-2010 at 04:05 PM.

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    Senior Member EVILFORCE's Avatar
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    #1
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  4. #3
    Senior Member lbhsbz's Avatar
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    Why?

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  6. #4
    gn7
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    because they are both to big, and it is the smaller of the two The 112 LSA may be of some help. Personally, I'd install it at 108 IC.



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    Senior Member lbhsbz's Avatar
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    Ok, any other recommendations for a better one?

  8. #6
    Senior Member EVILFORCE's Avatar
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    Quote Originally Posted by lbhsbz View Post
    Ok, any other recommendations for a better one?
    I myself, but remember I don't know anything, would look for something in the 630-645 lift and a adv duration in the 297-305 area with a lobe sep of at least 110. It would be roller lifter as well. Solid and not hydraulic. You could get more power with the 108 lobe sep but I am guessing since you live in Cali you are running wet headers. 108 is a little iffy. Just my opinion. Now. GN7. Tell him what he needs.
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    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    I myself, but remember I don't know anything, would look for something in the 630-645 lift and a adv duration in the 297-305 area with a lobe sep of at least 110. It would be roller lifter as well. Solid and not hydraulic. You could get more power with the 108 lobe sep but I am guessing since you live in Cali you are running wet headers. 108 is a little iffy. Just my opinion. Now. GN7. Tell him what he needs.
    I'm running dry headers.

    Cool, I'll see what I can find in that range.

    Now..the cams that I have...what are they good for?

  10. #8
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by lbhsbz View Post
    I'm running dry headers.

    Cool, I'll see what I can find in that range.

    Now..the cams that I have...what are they good for?
    This one is similar to what I'm running in my 467, 12.5:1 v-dive flat (works well for me).

    Cam #2: Lift
    In - .706
    Ex - .697
    Duration
    In - 268° @ .050
    Ex - 275° @ .050
    Lobe Sep - 109°
    Intake Cent. - 105°
    Quote Originally Posted by gn7 View Post
    Carnivalride, you really need to find some other hobby. You have no talent for this boat thing

  11. #9
    gn7
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    Quote Originally Posted by Carnivalride View Post
    This one is similar to what I'm running in my 467, 12.5:1 v-dive flat (works well for me).

    Cam #2: Lift
    In - .706
    Ex - .697
    Duration
    In - 268° @ .050
    Ex - 275° @ .050
    Lobe Sep - 109°
    Intake Cent. - 105°
    No kidding. Imagine that!



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  12. #10
    Senior Member EVILFORCE's Avatar
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    What GN is trying to say ( I think) is your cams are BIG and to get the most out of them they need High Compression to get to their potential. Then you will need Race Fuel as well. I am thinking along the lines of 11.5 to 1 minimum to make the best power.
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  13. #11
    gn7
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    It will run and it will gops of power. But if you were to have a custom ground, I bet it would have alittle less timing and possily alittle more lift, considering the heads, than the first one. And probably a LSA around 110. But if you have that cam, I'd stuff it in there.



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  14. #12
    Senior Member lbhsbz's Avatar
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    In thinking about this for a bit, since the consensus seems to be that I need a smaller cam, I imagine I could bring one of these 2 down and have it reground to something that would better suit my combo. I'm pretty good friends with the new owner of Engle, so maybe he can cut me a deal....and Isky is right up the street if Engle won't help me out.

    Should I just talk to the cam grinder and see what they recommend? Cam number one is the RJ-86/130 from Engle, which they list for 3500-7200RPMs. A step down would be their RJ - 83/86 which they list for 3200-6800. Any other catalog grinds from Engle or Isky that look good for me?

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    I'd run the second one with these changes: Advance cam to 103 Intake center. Loosen the lash on the intake .004" and tighten the lash on the exhaust .004".
    Chris Straub
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  16. #14
    gn7
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    See, that's why we keep Chris around Question Chris. Did you pick this cam because the lift more closely matches the heads first and foremost? And then make the changes to the lash and the installed centerline to get the events closer to the desired numbers.



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    Last edited by gn7; 08-02-2010 at 08:27 AM.

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