BBC pushrod question
+ Reply to Thread
Results 1 to 6 of 6

Thread:
BBC pushrod question

  1. #1
    Senior Member
    Join Date
    Nov 2011
    Posts
    136

    Default BBC pushrod question

    i bought a running 454 off of craigslist, it ran for a while then lost main bearings, when i was taking it apart i noticed all of the pushrods are the same length, i thought BBC had staggered pushrods, when searching for new 3/8" pushrods i see they sell them staggered and all the same length. with a factory ratio roller rocker should i get staggered or same length pushrods? cam will be .260/.260 at .050 duration with .600/.600 lift.

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Some guy obnoxious001's Avatar
    Join Date
    Dec 2007
    Posts
    3,571

    Default

    Quote Originally Posted by SimplyOrange View Post
    i bought a running 454 off of craigslist, it ran for a while then lost main bearings, when i was taking it apart i noticed all of the pushrods are the same length, i thought BBC had staggered pushrods, when searching for new 3/8" pushrods i see they sell them staggered and all the same length. with a factory ratio roller rocker should i get staggered or same length pushrods? cam will be .260/.260 at .050 duration with .600/.600 lift.
    Out of curiosity, how long are they? Normally intake and exhaust are close to 1" different, hard to imagine that it was working with all 16 the same.

    To get proper rocker arm geometry, you can't just order pushrods and put them in the engine, since there are variables in components. To get it correct you have to get the engine assembled to the point where you can use adjustable pushrods to determine what length you need to buy.

  4. #3
    Senior Member
    Join Date
    Nov 2011
    Posts
    136

    Default

    the rockers and cam i am using were being used with stock pushrods, i was just going to go back stock length, im wondering if somebody put the wrong pushrods in it and its why the motor seemed so underpowered.

    does anybody have an adjustable pushrod i can borrow when the time comes?

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Some guy obnoxious001's Avatar
    Join Date
    Dec 2007
    Posts
    3,571

    Default

    Quote Originally Posted by SimplyOrange View Post
    the rockers and cam i am using were being used with stock pushrods, i was just going to go back stock length, im wondering if somebody put the wrong pushrods in it and its why the motor seemed so underpowered.

    does anybody have an adjustable pushrod i can borrow when the time comes?

    How long were these "stock" pushrods? Rough measurement with a tape measure is fine.

  7. #5
    Senior Member
    Join Date
    Nov 2011
    Posts
    136

    Default

    ill have to measure when i get home, i just noticed when shopping online that all of the sets come with 2 different lengths.

  8. #6
    cfm
    cfm is offline
    Banned
    Join Date
    Jan 2008
    Posts
    1,263

    Default

    BBC's use a different length intake pushrod vs exhaust.

    Since this motor is going to need a total rebuild, take the time and familiarize yourself with BBC's and have it rebuilt right. During that time, see what the engine has for parts in it - apparently whomever put this motor together last had no clue - as it may/probably have other wrong parts in it.

    Pushrods don't brake for no reason, so chances are for whatever reason the old pushrods where replaced, there is another reason. Batched rebuild or whatever. Who know until this thing is studied hard !

+ 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