Results 1 to 4 of 4

Thread: BBC Rocker Arm Ratios

  1. #1
    Junior Member APPRENTICE
    Join Date
    Nov 2006
    Posts
    13

    BBC Rocker Arm Ratios

    Generally speaking if someone is switching from 1.7 ratio to 1.8 or 1.85 on a BBC does the pushrod length change as well? I currently run 1.7 ratio on a solid roller and would like to try 1.8 in lieu of changing cams. Are there other downsides to running a higher ratio rocker? What brand are you guys using? Thanks.

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Mar 2007
    Location
    Texas
    Posts
    525
    Make sure you have clearance for your pistons are you will hit the valves.
    Wesley
    60' 1.30
    5.58 @ 127.89

  3. #3
    Junior Member APPRENTICE
    Join Date
    Nov 2006
    Posts
    13
    Thanks Woodsman. Any other thoughts about changing rocker ratios instead of changing cams?

  4. #4
    Administrator RACING JUNKIE
    Join Date
    Mar 2004
    Location
    Maine,USA
    Posts
    1,208
    You must check for proper clearancing at the retainer and also piston to valve clearance.This upgrade will give you more lift at the valve.

    So yes it is possible you might need a different push rod,you just have to make sure you have good geometry from the rocker arm and valve,so to speak

    Here is a little bit of info for you

    http://www.compcams.com/information/Products/Pushrods/
    There Is 1 Thing Better Than Cubic Inches,,,More Of Them


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy