Small Block Jet, How Fast?
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Small Block Jet, How Fast?

  1. #1
    Senior Member wizard612's Avatar
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    Default Small Block Jet, How Fast?

    Any one out there have a small block jet. Give me a idea of the boat and it's performance.

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  3. #2
    Spiral out MikeF's Avatar
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    Tom, You might ask that question over here too. Might get more input.

    http://www.outlaweagle.com/forum/

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    Large Member edog's Avatar
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    I got a SBC in a 16'. It does around 54.9 mph.

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    Senior Member gregb's Avatar
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    I had my 18 foot Marlin doing 70 with a 383SBC as it was burning up a rocker arm, turning an A impeller 5K.

  8. #6
    Banne'd Cobra1's Avatar
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    I believe the Eagles run the zz4, and some are hitting 700 + with a built zz4. I wouldn't mess with anything less than a stock zz4 or a fast burn. You'll kill a stock 350. Or just have whacker's make fun of you all day long.

    Hey but look at kachina, I see they still put pumps in 24's and 25's. Now that's under powered. I think I saw an 05 25' for sale with a pump.


    And I just priced a new 496, grab your ankles.

  9. #7
    Senior Member jetboatperformance's Avatar
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    Built several N/A Small block jets (SBF and SBC) both our most recent projects run 80 .. Tom

  10. #8
    Senior Member GT Jets's Avatar
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    Small blocks can be impressive, their downfall is the lack of mid range torque due to the lower displacements, so they have to be allowed to spin. If set up right they can be downright fast, the key is hull setup, impeller selection and camshaft, the ZZ4 with a GMPP Hot cam runs pretty good in a jet. Check these out.




    ZZ4

    Running 8 miles from the Pacific on the Rogue (Ore.) in the '08 Worlds

    BTW it was over 100* that day...


    GT
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    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

  11. #9
    Banne'd Cobra1's Avatar
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    Nice, I love watching those boats run. I think ARCA uses the ZZ4 in their race series. I wouldn't have any problem dropping one of those in a boat.


    Is that a radiator cap I see? You guy's run closed cooling on them and not off the pump??

  12. #10
    Senior Member Xerophobic's Avatar
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    Lots of boats running SB's in our business and the ZZ4 has proven to be an ultra reliable marathon race engine. So much so they have an entire class structured around it. FX class does not allow any modifications to the motor other than intake, headers, carb etc (ironically the best combination after extensive dyno tests show the stock manifold to work the best with a 1-2" spacer)

    A 19 Steptec like Merv's boat(yellow pictured above) is probably doing low/mid 80's with 2 aboard in race trim. Some of the lighter tunnels are reportedly starting to get close to 90 on a consistant basis.
    Ive heard lots of dyno numbers from these engines but the key to longevity is to stay at or BELOW 5k rpm. I think they can make about 385 Hp tuned right(355 advertised)

    07 Canadian worlds saw every boat in the class finish the 590 mile race with only one head gasket failure on one leg and there seemed to be alot more to that story than just a mechanical failure(dont ask!)

    Sb's work great, keep the boat light and as always GO ALLOY!

    If you ain't hittin bottom...you ain't jetboatin!

  13. #11
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    Hi Xero, I finally made it over here, hope all is well. Nothing wrong with running a SB, I get 75MPH or so and while it is an aluminum boat, its far from some super trick light weight race hull. Build them right and keep the RPM's low and the ZZ4 will run hard for quite awhile. Sure if you have a BBC, build it, especially if its heavy, but if you've got a solid SBC, build it and run it. It may not be perfect but it will work fine and be cheap to build. Most of the 'B' boats are running over 100MPH, some nearing 110MPH and they are limited to 355 cu in. Now those aren't exactly budget builds, but the point is it can be done-Aluminum Squirt

    PS-All I need now is a new ZZ4 and I'll be back in business myself

  14. #12
    Senior Member copterzach's Avatar
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    I had 1978 Beachcomber with a built 383. The motor was making 475 hp. It had a huge stereo syster in it. It would run 65 all day long.
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  15. #13
    Senior Member wizard612's Avatar
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    Mike
    Yea I saw it. Close to the old Wizard but I'm kind of glad that it's not. That one looks beat.

    Tom

  16. #14
    DJG
    DJG is offline
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    1973 eliminator v bottom, 400cid, 80 mph, American Turbine SD-312, 80 mph at 5240 RPM.

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