Page 1 of 2 12 LastLast
Results 1 to 10 of 16

Thread: bbc question

  1. #1
    Member JUNIOR BUILDER
    Join Date
    Jan 2006
    Posts
    98

    bbc question

    what is minimum piston to head clearance on steel rod bbc?

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Aug 2007
    Location
    Lost Creek, WV
    Posts
    533
    I typically run "zero" deck clearance and a Felpro #1027 head gasket which has a compressed thickness of .039. So my piston to head clearance is .039. Hope this helps. I'm sure others do it differently.

    TS1955

  3. #3
    Senior Member RACING JUNKIE curtisreed's Avatar
    Join Date
    Feb 2004
    Location
    KIEFER, OK.
    Posts
    1,309
    Watch your piston rock depending on how "big" your BBC is. RPM will also play into it some. Just some things to think about in the equation.

    Curtis

  4. #4
    We recommend a min of .040 between the piston and the head.

  5. #5
    Senior Member EXPERT BUILDER
    Join Date
    Jan 2005
    Posts
    336
    my motor builder said once upon a time they set up thier pistons .005 thousandths in the hole

  6. #6
    Senior Member RACING JUNKIE curtisreed's Avatar
    Join Date
    Feb 2004
    Location
    KIEFER, OK.
    Posts
    1,309
    Quote Originally Posted by russ67chevelle
    my motor builder said once upon a time they set up thier pistons .005 thousandths in the hole
    russ,
    That doesn't tell you what the p to h clearance is. You could still have .060".

    Curtis

  7. #7
    Senior Member RACING JUNKIE
    Join Date
    Jun 2003
    Location
    Hobbs, NM
    Posts
    842
    Plus the gasket....

  8. #8
    Member JUNIOR BUILDER
    Join Date
    Feb 2008
    Location
    Childers Australia
    Posts
    99
    I think russ67 meant .005" = a "std" style gasket say 0.039" compressed & you'll generally be ok. X2 As doorracer says depending how "big" & rpm. I don't understand the last post.

  9. #9
    Senior Member RACING JUNKIE
    Join Date
    Jun 2003
    Location
    Hobbs, NM
    Posts
    842
    I dont see what would be hard to understand. .005 in the hole plus the gasket .039 would give you .044 clearance, between the flat part of the piston and the head. Which is where most pistons hit. Especially if because of the piston rocking in the cylinder.

  10. #10
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    Mine hit on the dome right by the intake valve...Motor was already together so I had to grind on a brand new set of heads.


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