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dart pro1 345

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    Default dart pro1 345

    Just looking for some opinions. I am looking to order some dart heads for my bbc 496 and was curious if the dart 345cc are to big for a 496 ?? Or if i should go with the 325 cc

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    Quote Originally Posted by offrd4whlz View Post
    Just looking for some opinions. I am looking to order some dart heads for my bbc 496 and was curious if the dart 345cc are to big for a 496 ?? Or if i should go with the 325 cc
    Yes they are too big. If your thinking of buying heads assembled and throwing them on your engine, DON"T. It very seldom works out well for those that try.

    You might consider getting ahold Steelcomp through a PM about AFRs or Canfields.
    I have 2 sets of Darts and one set of AFRs, one set of Canfields, and there is no comparison.



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    Might wanna lay out what your objectives are. Wouldn't be my first choice for a 6000 RPM hyd roller pump gas deal in a heavy cruiser combo but might consider them as a start for a higher RPM/CR drag race/fast lake boat.
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

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    The 496 is in a 19 daytona. Right now i have a set of brodix heads that are a little small. My cam is about 690 total lift. Tunnel ram with 750s.

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    Quote Originally Posted by offrd4whlz View Post
    The 496 is in a 19 daytona. Right now i have a set of brodix heads that are a little small. My cam is about 690 total lift. Tunnel ram with 750s.
    What do you consider small? For anything in the 6000 rpm range a large oval port will fit the bill just fine. I wouldn't run anything bigger than a 305-310 with the right cam. 325's are un-necessarily big, and 345's are un-necesarily huge. You can get away with a little bigger port with a jet, but you don't need it.
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    Right now they are 270cc oval port. Was hoping to switch to rec. Port intake and some bigger heads to make more power?

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    Quote Originally Posted by offrd4whlz View Post
    Right now they are 270cc oval port. Was hoping to switch to rec. Port intake and some bigger heads to make more power?
    With just the head and manifold change you'll be very disappointed in the gain if there is any.



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    Quote Originally Posted by offrd4whlz View Post
    Right now they are 270cc oval port. Was hoping to switch to rec. Port intake and some bigger heads to make more power?
    I agree...that's a little small for what you're doing. If you already have the oval intake, you might look at the AFR 290 or the new 300cc ovals. The 300 is a smokin head but doesn't flow much over .700 lift. Tons of low lift, lots of flow, lots of velocity= low rpm tq. I think a jet needs a little more torque upstairs and not so much downstairs. I still think a small rect port with the right cam would be your best choice overall.
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    Quote Originally Posted by gn7 View Post
    With just the head and manifold change you'll be very disappointed in the gain if there is any.
    You'll probably blow this off too, but without an appropriate cam change, you're probably right.

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    Quote Originally Posted by steelcomp View Post
    You'll probably blow this off too, but without an appropriate cam change, you're probably right.

    Bigger ports, bigger manifold, bigger carbs, very seldom help anything that doesn't open the valve far enough.
    I guess thats how the term "combo" got started.
    Life was so much easier when you bought the largest heads to go with the largest carb and manifold and bought the cam at the bottom of the page hoping it was "lumpy enough". No its all complicated and shit.



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    On a 270 Brodix RR headed 496 you need about 14 to 16 degree split at .050" tappet height. My guess the cam you have is no where near this. If you have a solid roller we can prove this with lash adjustment. If you want a few links to trying this I can point you in the right direction.

    I would guess the engine gets to an rpm and it doesn't want to go any further. You have tried changes and it hasn't helpped, still stops at that rpm. I've got pump gas 496's with those heads making 650HP but the exhaust needs duration.
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    Quote Originally Posted by cstraub View Post
    On a 270 Brodix RR headed 496 you need about 14 to 16 degree split at .050" tappet height. My guess the cam you have is no where near this. If you have a solid roller we can prove this with lash adjustment. If you want a few links to trying this I can point you in the right direction.

    I would guess the engine gets to an rpm and it doesn't want to go any further. You have tried changes and it hasn't helpped, still stops at that rpm. I've got pump gas 496's with those heads making 650HP but the exhaust needs duration.
    Another good point and I can confirm what Chris is saying. Not too many shelf cams with that much int/ex duration split and those heads definitely need it.
    Last edited by scott foxwell; 12-05-2012 at 08:19 PM.
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    I have some AFR 325cc that I had cnc ported on my 496, But it has a custom ground cam that goes with them, yes they may be overkilll but it runs great with a profiler t-ram with dominator 750s, turning a SS a/b at 5800 in 21'Daytona 103mph, 10 to1 pump gas ,no nos, yet. I was going for the AFR 315cc but couldnt pass up the price for the 325cc

    I would listen to the advice that gn7, cstraub , steelcomp are given you. Top Notch
    Last edited by BrotherWolf; 12-06-2012 at 07:26 PM.
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    For a jet boat the Dart 345 heads are better than 325's as long as the cam and rpm ( Impeller size) is correct.You need .750 to .800 lift on the cam with good set of springs and cam duration at about 282 int and 296 ext at .050 with a 110 to 112 Cent / Line.I would run a B/C impeller at 6800 RPMs.Dart tunnel ram with 2 1050's and a compression ratio of at least 14 to 1. This is if you want to go fast. If its just a ski boat and not a race boat keep what you got.
    Last edited by PCE680; 12-05-2012 at 09:18 PM.

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