[Question] Motor Swap from Olds 455 to SBC/Vortec
+ Reply to Thread
Results 1 to 3 of 3

Thread:
Motor Swap from Olds 455 to SBC/Vortec

  1. #1
    Junior Member
    Join Date
    Oct 2015
    Posts
    1

    Default Motor Swap from Olds 455 to SBC/Vortec

    I have a 1976 Checkmate with 455 Olds and Berkly Jet, last refresh was 2001, and it has been sitting for just over 10 years now since last ran. I know the motor needs to come out and get rebuilt again. The motor has log manifolds with over the transom exhaust and is not family friendly for tubing. I no longer need to go fast with this boat in as much as I would like to use it for family tubing. I was thinking of repowering with a new/used Vortec V8 and through hull exhaust. I am willing to spend the money on the project because I would rather keep the classic and tow my kids safely w/o a prop in the water, no doubt I can go buy a small bowrider or CC for less money then it will cost to give this old classic a family deserved rebirth. Looking for advice/opinions open minded please chime in

    Thanks !

    Gregg

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Junior Member
    Join Date
    Jan 2014
    Location
    south central Idaho
    Posts
    14

    Default

    Was the motor weak when you last ran it or are you thinking that because it sat for ten years it needs a refresh, If its the later why not just buy some snells and tips and run it?

  4. #3
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,463

    Default

    We have successfully built and repowered several small block and small cubic inch jets over the years , small blocks have advantages (weight and inexpensive investment ) and disadvantages (less "grunt" HP among other issues) , In an 16' boat they work well, in a 18 or 19 a basic 5.7 L SBC will provide adequate but somewhat anemic performance , might want to also give some consideration to an LS they make serious power with relatively little work

+ Reply to Thread

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