Olds 455 > 307 Question
+ Reply to Thread
Results 1 to 7 of 7

Thread:
Olds 455 > 307 Question

  1. #1
    Junior Member
    Join Date
    May 2010
    Posts
    1

    Default Olds 455 > 307 Question

    I just picked up a jet boat powered by a 455 Olds with big C heads. Nice engine but the previous owner over revved her, bent some pushrods, broke some valve heads off and badly damaged one head.
    I need to put in a temporary engine to use the boat while I go through the 455. I have a sweet 1990 Olds 307. In my research I see that some exhaust manifold gaskets are listed as the same and some are not. Water pump plate gasket appears to be the same. I need a definative answer from an Olds Guru .. will The Hardon exhaust manifolds and water pump plate bolt to the 307? And will the drive coupling (flexplate) bolt to the crank. The engine itself, I'm assuming, will bolt in without any modifications .. Thank you for your time ... Frank in Arizona

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Junior Member
    Join Date
    Mar 2009
    Posts
    21

    Default

    Hi Frank. Ask the guys over on realoldspower.com they'll know for sure.
    Hope that helps.
    Tim

  4. #3
    Member Dave01's Avatar
    Join Date
    Sep 2008
    Location
    NH
    Posts
    66

    Default

    I don't know the answer, but ..... seems like a lot of work, setting up and installing a temp engine while you work on the 455, especially since I doubt you'll be happy with the replacement. If you just concentrate on the 455 seems like you'd have it together and back in fairly quick.

    Just thought I'd ask .....
    '86 Eliminator Sport 20, Chevy 454, Berkeley 12JG w/jetovator

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member SoldHondaBoughtHondo's Avatar
    Join Date
    Oct 2009
    Location
    Lake Havasu az.
    Posts
    4,318

    Default

    Quote Originally Posted by NazFrank View Post
    I just picked up a jet boat powered by a 455 Olds with big C heads. Nice engine but the previous owner over revved her, bent some pushrods, broke some valve heads off and badly damaged one head.
    I need to put in a temporary engine to use the boat while I go through the 455. I have a sweet 1990 Olds 307. In my research I see that some exhaust manifold gaskets are listed as the same and some are not. Water pump plate gasket appears to be the same. I need a definative answer from an Olds Guru .. will The Hardon exhaust manifolds and water pump plate bolt to the 307? And will the drive coupling (flexplate) bolt to the crank. The engine itself, I'm assuming, will bolt in without any modifications .. Thank you for your time ... Frank in Arizona
    455 to 307...exhaust it the same.....except for it is in a slightly higher position on the 455 because the block is taller , intake is NOT the same
    front of the block is the same....

    probably kind of a waste for a swap...you would be lucky to get a ticket on the no wake zone @wot
    Last edited by SoldHondaBoughtHondo; 05-12-2010 at 07:10 PM.
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
    Maricopa County Sheriff's Office

  7. #5
    Junior Member Elimin8R's Avatar
    Join Date
    Aug 2009
    Location
    Santa Clarita, CA
    Posts
    27

    Default

    Quote Originally Posted by NazFrank View Post
    I just picked up a jet boat powered by a 455 Olds with big C heads. Nice engine but the previous owner over revved her, bent some pushrods, broke some valve heads off and badly damaged one head.
    I need to put in a temporary engine to use the boat while I go through the 455. I have a sweet 1990 Olds 307. In my research I see that some exhaust manifold gaskets are listed as the same and some are not. Water pump plate gasket appears to be the same. I need a definative answer from an Olds Guru .. will The Hardon exhaust manifolds and water pump plate bolt to the 307? And will the drive coupling (flexplate) bolt to the crank. The engine itself, I'm assuming, will bolt in without any modifications .. Thank you for your time ... Frank in Arizona
    Nope!

  8. #6
    Senior Member
    Join Date
    Dec 2007
    Location
    Newbury Park, Ca/Mohave Valley, Az
    Posts
    8,169

    Default Explain..........

    Quote Originally Posted by NazFrank View Post
    I just picked up a jet boat powered by a 455 Olds with big C heads. Nice engine but the previous owner over revved her, bent some pushrods, broke some valve heads off and badly damaged one head.
    I need to put in a temporary engine to use the boat while I go through the 455. I have a sweet 1990 Olds 307. In my research I see that some exhaust manifold gaskets are listed as the same and some are not. Water pump plate gasket appears to be the same. I need a definative answer from an Olds Guru .. will The Hardon exhaust manifolds and water pump plate bolt to the 307? And will the drive coupling (flexplate) bolt to the crank. The engine itself, I'm assuming, will bolt in without any modifications .. Thank you for your time ... Frank in Arizona
    Please explain the "big C heads" part..........Olds C heads are good heads, but they're not the big heads......Some early ones were 70cc for high comp motors, but most are 80cc chambers with 2.00 intakes...1.625 exhaust.....Explain big....Ray
    LOUD BOATS SAVE LIVES

  9. #7
    Senior Member SoldHondaBoughtHondo's Avatar
    Join Date
    Oct 2009
    Location
    Lake Havasu az.
    Posts
    4,318

    Default

    Quote Originally Posted by Elimin8R View Post
    Nope!
    Opps..i forgot about that...you either have to use a flywheel or make a spacer about half inch thick or grind the the end of the crank down..the rear crank snout sticks through the flexplate so the pto won't mount flat...but jet boat should have stick shift flywheel...and it will look like the boat pattern don't match cause it only goes on one way..and all the flywheels/flex plates are external balance.... here is a page with olds info....note the 307 make 180 hp...they use to come in early 80's cadillacs and ran about as well a a 350 olds diesel


    http://www.442.com/oldsfaq/ofeng.htm
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
    Maricopa County Sheriff's Office

+ 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


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