Good vs Bad on Dart Heads
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Good vs Bad on Dart Heads

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    Senior Member TNYoungblood's Avatar
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    Default Good vs Bad on Dart Heads

    I've get a friend who has a set of Dart pro 1 for sale and I think they would work great for my future motor build (540 or bigger) ... Is there any thing to look out for in Dart heads ???? I was lookin out for a set of Brobix but these "seem" like a good deal from a honest man .. Just wanted somebody elses input .. I think there the big 1s 355 cc .. Is this gonna be to much head for a pump gas 540 ???

    Thanks
    Last edited by TNYoungblood; 07-12-2010 at 12:46 PM.

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    Senior Member hotbo's Avatar
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    Quote Originally Posted by TNYoungblood View Post
    I've get a friend who has a set of Dart pro 1 for sale and I think they would work great for my future motor build (540 or bigger) ... Is there any thing to look out for in Dart heads ???? I was lookin out for a set of Brobix but these "seem" like a good deal from a honest man .. Just wanted somebody elses input .. I think there the big 1s 355 cc .. Is this gonna be to much head for a pump gas 540 ???

    Thanks
    imo yes,be good for a blower deal?

    velocity is the key

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    steelcomp was here
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    Quote Originally Posted by TNYoungblood View Post
    I've get a friend who has a set of Dart pro 1 for sale and I think they would work great for my future motor build (540 or bigger) ... Is there any thing to look out for in Dart heads ???? I was lookin out for a set of Brobix but these "seem" like a good deal from a honest man .. Just wanted somebody elses input .. I think there the big 1s 355 cc .. Is this gonna be to much head for a pump gas 540 ???
    Thanks
    Yes. With a 2.300 inatke valve, the Canfield 310's I'm selling are almost perfect for a 540.

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    Senior Member Filucky's Avatar
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    The 355 cnc'd flow about 415 cfm, that is not too much for a n/a 540. I would think these heads could support around 800hp on a pump gas 540.
    Nice!

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    gn7
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    So you would rather run a 355 with say, 415, ....than a 310CC head flowing say, 380. And I assume, RPM is a none issuse in your choice.



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    Quote Originally Posted by Filucky View Post
    The 355 cnc'd flow about 415 cfm, that is not too much for a n/a 540. I would think these heads could support around 800hp on a pump gas 540.
    It's got nothing to do with flow.

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    Senior Member alkyexpress's Avatar
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    Quote Originally Posted by steelcomp View Post
    It's got nothing to do with flow.
    Is it more port velocity at a giving rpm than total flow, so the motor is happy at the rpm range it is being used at ? ...............E

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    Quote Originally Posted by alkyexpress View Post
    Is it more port velocity at a giving rpm than total flow, so the motor is happy at the rpm range it is being used at ? ...............E
    Something like that. Flow is important, but not most important. Flow through the wrong size port is not useful.

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    gn7
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    If the port is lazy, just spin the SOB faster. The port will catch up eventually



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    Senior Member alkyexpress's Avatar
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    [QUOTE=gn7;1156532]If the port is lazy,

    Isn't that what the blower is for ? ...........E

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    Senior Member Filucky's Avatar
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    By the time you port a Canfield 310cc head to flow good numbers it is opened up to about a 330cc, right?

    Canfield: 380 cfm / 330cc runner= 1.15

    Dart Pro1: 415cfm / 355cc runner= 1.16

    So according to some very basic math the head flow to runner size is almost identical between the two heads. But just for fun lets throw in some big heads.

    Profiler Hitman 12*: 500 cfm / 470cc intake runner= 1.06

    So according to you guys these heads would run like complete crap on lets say a 565 bbc? Because the ports would be way too big and lazy for a jetboat motor? There might be some guys on here that would argue you on that.

    So Canfield heads are just right for a 467, but the Dart 355's are to big for a 540?

    TNYoungblood, if you can get a good deal on those Dart 355's i'd jump on 'em, But that is just my opinion.
    Nice!

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    Distinguished Member David 519's Avatar
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    Quote Originally Posted by TNYoungblood View Post
    I've get a friend who has a set of Dart pro 1 for sale and I think they would work great for my future motor build (540 or bigger) ... Is there any thing to look out for in Dart heads ???? I was lookin out for a set of Brobix but these "seem" like a good deal from a honest man .. Just wanted somebody elses input .. I think there the big 1s 355 cc .. Is this gonna be to much head for a pump gas 540 ???

    Thanks
    For a NA 540 pump gas motor a lot of guys are having great success with the Dart 325 heads in a flat (say up to about 7300 or so). Jet, you might want to go a bit smaller since the RPM is lower. If it's blown, the head is a bit less of an issue since the blower does most of the work filling the cylinder. Quality wise, I've always had good luck with Dart & Brodix products.
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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    Quote Originally Posted by Filucky View Post
    By the time you port a Canfield 310cc head to flow good numbers it is opened up to about a 330cc, right?

    Canfield: 380 cfm / 330cc runner= 1.15

    Dart Pro1: 415cfm / 355cc runner= 1.16

    So according to some very basic math the head flow to runner size is almost identical between the two heads. But just for fun lets throw in some big heads.

    Profiler Hitman 12*: 500 cfm / 470cc intake runner= 1.06

    So according to you guys these heads would run like complete crap on lets say a 565 bbc? Because the ports would be way too big and lazy for a jetboat motor? There might be some guys on here that would argue you on that.

    So Canfield heads are just right for a 467, but the Dart 355's are to big for a 540?

    TNYoungblood, if you can get a good deal on those Dart 355's i'd jump on 'em, But that is just my opinion.
    Well if you want to make up a bunch of numbers to be right, then yes, that works.

  16. #14
    Senior Member hotbo's Avatar
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    the dart heads will be to big,

    but who cares buy them anyway and you'll feel better about yourself.

    you can go around and tell everyone my boat runs harder and i have some heads with big ol ports so therefor it must be better.

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