Small block
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 27

Thread:
Small block

  1. #1
    Member
    Join Date
    Dec 2008
    Posts
    49

    Default Small block

    How will an 18' jet boat run with a Stock 350 Small block chevy? I am not looking to break any speed records. Just curious what to expect. Thanks

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member
    Join Date
    Mar 2008
    Location
    San Diego
    Posts
    1,535

    Default

    Just a WAG..... 50mph. Twin turbo that bitch, then she'll really move.




    Darrell.
    San Diego.

    28ft Sportcat
    With Twins

  4. #3
    Senior Member Delemorte's Avatar
    Join Date
    Mar 2008
    Location
    Charlotte, NC.
    Posts
    1,553

    Default

    I run one in my 18 sleek craft. Its fun on the lake with freinds.. She wont win any races but its a lot of fun.. As its my first boat period i also think its a nice place to start before getting into a big block.
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    "Try it Now!" Tahiti Boss21's Avatar
    Join Date
    Jun 2008
    Location
    Yucaipa, California
    Posts
    3,704

    Default

    good friend of mine has been running a stock 327 in his 18' hallet jet for years and years, thing goes all day long 50 mph wot. Even runs good with a boat full of fat asses, and a quadrajet.
    1992 Eliminator Daytona 21'

  7. #5
    Senior Member 1975DiMarco490ci's Avatar
    Join Date
    May 2008
    Location
    Glendale (AZ)
    Posts
    288

    Default

    friend has a 19ft charger with a 350 and a jacuzzi pump topped out at 43.0 with 3 people. with the impeller jacked up
    Last edited by 1975DiMarco490ci; 01-24-2009 at 06:22 PM.
    WILL KILL FOR A GULLWING.


  8. #6
    Senior Member gregb's Avatar
    Join Date
    Jan 2008
    Location
    Redondo
    Posts
    375

    Default

    I got about 62 out of mine (18 footer), had a comp cam, sportsman heads, performer rpm intake, and a 750DP. Not sure about the impeller, think it was a B cut, running about 4800 rpms. When it was stock with the Q-jet it would do 55 downriver on a good day at 4500 rpm. Lot of fun, ran all day on one tank pulling people, screwing around, and reliable as old yeller. Replaced it last year with a 383 SBC, turned and A impeller 5K and went 70 as it was burning up a rocker arm, haven't had it out since, replaced all the rockers and had the impeller cut and detailed, just waiting for a day to mess around with it.

  9. #7
    Bouncing off rocks TryMe's Avatar
    Join Date
    Sep 2008
    Location
    St Louis
    Posts
    82

    Default

    i only have a 15' boat, but with about 325hp, C impellor, it would run 65mph at 5400rpm.

  10. #8
    Member
    Join Date
    Dec 2008
    Posts
    49

    Default

    Thanks alot. It is my first jet boat. I have not had it out yet because everything around here in ohio is frozen. I can already see it it going to be addictive. And I can see a bigger motor in the future.

  11. #9
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
    Join Date
    Dec 2007
    Location
    Newton Ks.
    Posts
    6,834

    Default

    Quote Originally Posted by ttshock View Post
    Thanks alot. It is my first jet boat. I have not had it out yet because everything around here in ohio is frozen. I can already see it it going to be addictive. And I can see a bigger motor in the future.
    "Morehorsepoweritis".

    A terrible disease.
    "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.

  12. #10
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,812

    Default

    never underestimate the power of a small block! With the right heads and cam it is amazing the power that can be produced. They do however lack a pinch in the torque area. Do your'e self a favor and spend the money in the right spots and blow people away. you are already light so forget the 1k on aluminum heads and track down a good set of 492 angle plug iron heads. Have those worked and a good cam with a 750 carb and you are dancing in the 400 h/p range. I had a 19 ft daytona mini daycruiser with a good combo and ran 5k and estimated 55 mph and was a great boat, tons of fun and ran on a tank of gas all day long!! IMLOA Mark

  13. #11
    Senior Member carreradude's Avatar
    Join Date
    Dec 2008
    Location
    Rancho Cordova. CA
    Posts
    649

    Default

    I have a 406ci small block in my 1972 Elcamino drag car that can shove all
    3800lbs of it down the track doing 11.33 @ 120mph on the 1/4 mile. It is a 13 to 1 full roller motor with Dart heads and a tunnel ram. DT dyno says
    600 horse. It would make a fun ride in a small boat!!

  14. #12
    Senior Member GT Jets's Avatar
    Join Date
    Jun 2008
    Location
    Morgan Hill
    Posts
    2,234

    Default

    Small blocks are cool, cheap HP, the thing you have to remember is you can't run it like a big block, you need the advantage of some rpm.

    We have run a 355 SBC in an aluminum hull with a BC impellered Dominator and ran 70 MPH all day long, but at 5900 RPM, so oil cooler, big pan, big exhaust, and open plenum hogged out intake with a good carb. are a must.

    A small block will run forever at 6K as long as its built for it. Make sure to get a good quality rev. limiter.

    GT
    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......

  15. #13
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,463

    Default

    Not a bad choice , you'lll have alot of fun ,like Old guy said don't underestimate the small motors ! Tom

    * heres a pair we built ,one sbf one sbc both run just under 80 ,finishing up another right now ,I'll post up pics soon ,call, post or PM if you need help




  16. #14
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,812

    Default

    Quote Originally Posted by carreradude View Post
    I have a 406ci small block in my 1972 Elcamino drag car that can shove all
    3800lbs of it down the track doing 11.33 @ 120mph on the 1/4 mile. It is a 13 to 1 full roller motor with Dart heads and a tunnel ram. DT dyno says
    600 horse. It would make a fun ride in a small boat!!
    Congrats! An all steel 72 is not a light car! I built a 1978 street and daily driver that would click a mid 13 and drive home. Like I said "never underestimate" the small block! With or with-out the long arm. M

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95