What Cam Should I Use??
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What Cam Should I Use??

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    Senior Member CHEVY JET's Avatar
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    Default What Cam Should I Use??

    I Have A 30 Over 454 About 9.5 To 1, With A Torker Intake, And Oval Port Heads. Hydrolic Cam And Roller Rockers. Basicly A Stock Motor. What Cam Should I Use? The Motor Was In A Nova Befor I Bought It. Im Also Running Headers Instead Of Logs. Just Curous What Cam I Should Use. Thanks In Advance, Don

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    Sit N' Spin Jetaholic's Avatar
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    Assuming the engine is actually 9.5:1 compression ratio and you have the LARGE OVAL heads (not the small oval, aka "peanut" or "truck" heads), the Isky 280H Mega cam is a great cam for that combination. There are better manifolds than the Torker though so if that were my engine I would consider getting a different intake. If you wanna stay single plain intake I've heard the Victor intakes work really well as they are a high rise design. For a dual plane manifold I recommend the Edelbrock RPM Air Gap manifold.

    On my last motor, with that very same cam I mentioned above, 9.5:1 compression and large oval port heads (casting 353049) with bigger valves (2.190" intake, 1.880" exhaust), Bassett OT headers (standard long collector) and an Edelbrock RPM Air Gap manifold with a Holley 750dp carb, I spun an American Turbine AB impeller to 5400 RPM with baffles installed in my headers and a White Lightning loader in the pump and that got my 18' Marlin (tahiti tiger copy) to 79mph.
    Last edited by Jetaholic; 08-13-2009 at 10:12 AM.



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    Bostick Racing Engines six-oh-nine's Avatar
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    Quote Originally Posted by CHEVY JET View Post
    I Have A 30 Over 454 About 9.5 To 1, With A Torker Intake, And Oval Port Heads. Hydrolic Cam And Roller Rockers. Basicly A Stock Motor. What Cam Should I Use? The Motor Was In A Nova Befor I Bought It. Im Also Running Headers Instead Of Logs. Just Curous What Cam I Should Use. Thanks In Advance, Don

    You're going to get about 101 opinions on this subject... and some other factors are going to play into what you want to go with to suit your application... and the best thing to do would speak to a cam grinder to get exactly tailored to your needs cam...


    but...

    For a off the shelf... one size fits all... Schneider JB-4H works well for a relativly stock oval port dealy-o in a basic stock jet boat...

    228/240 @.050 .540 lift 110 seperation.
    Last edited by six-oh-nine; 12-29-2008 at 10:05 PM.
    The Bostick®

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    Senior Member rorybsst's Avatar
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    talk to john @ bullet racing cams tell him engine size /compression/pumptype impellersize/ and boat weight and size and he can customgrind you exactly what you will need . not bad on prices either.

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    Let me second the motion on talking to John at Bullet Racing Cams. 662-893-5670. Over the last 25 years i`ve bought at least 30 cams from John. I`d call him and tell him what i had and what i wanted it to do. Then i`d ask about a particular cam and he might say "no, you need this different cam". It might be bigger or smaller but would be just exactly what i needed every time. Oh, and don`t forget to check your retainer to top of valve guide clearence if you go over a .550 lift.

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    Senior Member CHEVY JET's Avatar
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    The Casting #'s Are 336781 Gm11t 1-29-77. Im Asuming The Gm11t Means There Off A Truck, And The 1-29-77 Is The Date Code, But Im Not Sure Of The Casting 336781. Probly Means Small Port Open Chamber Street Car Junk. It Spun My Berkly A Impeller To 4900 Rpm With A Single 850 Holly And The Torker Ii Intake. No Loader In The Pump. It Just Has The Rock Rgate With The Angled Fins. Thanks Guys For The Help, All Is Welcomed.

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    Sit N' Spin Jetaholic's Avatar
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    Nope those are great heads. From what I've been told those are the replacements for the 353049 heads that are really popular on jet boats. So you've got a great set of heads to work with there.



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    Quote Originally Posted by back2k5 View Post
    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

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    Senior Member hotbo's Avatar
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    imo anything around 240 at .050 duration and 550 lift.those 781s are good heads.buy a good loader while you at it.good luck.

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by Jetaholic View Post
    Nope those are great heads. From what I've been told those are the replacements for the 353049 heads that are really popular on jet boats. So you've got a great set of heads to work with there.
    Thought you were backwards, but a dig says the '781 casting is a '73-'85 production, while the '049 is a '73-'84 production.
    Apparently co-produced, if I was a betting man, different foundries.

    Basically nearly identical heads, and the "good" head for a stock to moderately modified jetboat IMO.

    Open chamber head, arround 120cc, '77 production year by your numbers.
    Closed chamber heads varied from arround 95cc to 109cc

    Intake runners are about 255cc, as opposed to around 220cc for "peanuts", small oval ports.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    Senior Member ol guy's Avatar
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    Quote Originally Posted by hotbo View Post
    imo anything around 240 at .050 duration and 550 lift.those 781s are good heads.buy a good loader while you at it.good luck.
    I will X2 that combo By hotbo and toss in a 110 lobe center! M

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    Quote Originally Posted by CHEVY JET View Post
    I Have A 30 Over 454 About 9.5 To 1, With A Torker Intake, And Oval Port Heads. Hydrolic Cam And Roller Rockers. Basicly A Stock Motor. What Cam Should I Use? The Motor Was In A Nova Befor I Bought It. Im Also Running Headers Instead Of Logs. Just Curous What Cam I Should Use. Thanks In Advance, Don
    I am cranking a moderately modded 454, thru lightly ported heads, the Performer RPM Air Gap manifold, Thru-Transom headers to 5,400 against an Aggressor B-cut (same as a Berk A) (5,900 on the fun-fumes) spinning a custom-grind of the aforementioned Iskendarian 280H hydraulic flat.
    Roller rockers, mandatory.
    0.565" lift, 232* duration @ .050" lift, 110* Lobe Sep, set 4* advanced.

    Installed with Isky's Superlifters and Isky 8005-A springs.

    What can I say, 4 years behind it and it really works well. Not one single problem.

    The build-up on the motor was incremental, with nothing but the cam and intake the first year (small budget).
    The cam setup worked perfectly on the otherwise stock motor, thru log exhausts, and was even better when the headers went on (gained 200RPM).
    The head porting gained me 400RPM 2 years later.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    Senior Member CHEVY JET's Avatar
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    I Am Running These Heads With Flat Top Pistions, .03 Over And Stock Cast Crank. I Was Thinking It Was 9.0:1 To 9.5:1. Jmo. What Do You Think?

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    Default 049

    unless heads are milled a lot thats a 8.7 - 8.9 comp motor if you are dollars ahead i woud put a small roller cam look at a lunati grind 50228 226/234 568 lift 112/108 lobe c/l
    bbc eat non-roller cams just trying to save you some bucks here. as for the heads they are large oval port and if put the big valves in them and bowl blend you will be very happy with them. just my 2 cents.http://img72.imageshack.us/img72/1818/dscn4014uz8.jpg
    sorry v-drive 496 roller flat top 049 ported lunati 50200 254/269 595 lift 112/110 cL oval tunnel ram w/ custom dom top 1050 carb pump gas 9.1 comp oh ya three speed trans w/ rev
    Last edited by flat601; 12-30-2008 at 07:44 PM. Reason: forgot to post pic

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by CHEVY JET View Post
    I Am Running These Heads With Flat Top Pistions, .03 Over And Stock Cast Crank. I Was Thinking It Was 9.0:1 To 9.5:1. Jmo. What Do You Think?
    With open-chanber heads, 8.3:1.

    Sorry.

    I am at the moment running this flat-top combo too. There was no piston money at the rebuild 4 years ago. Next time will be different.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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