Results 1 to 6 of 6

Thread: 496 bbc compression on pump gas

  1. #1
    Senior Member EXPERT BUILDER
    Join Date
    Jul 2009
    nekoosa wisconsin

    496 bbc compression on pump gas

    im looking to build a 496 bbc for my camaro and want to run pump gas what do you guys think about 11:1 on pump gas

    block will get zero decked and i will use a 15-25 thousandths thick head gasket to achieve a good and low quench height
    it will be ran with aluminum heads also

    what do you guys think

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Mar 2003


    Thats NOT a Problem,but dont think you can Run 87 Octane and 38* of Timing!!
    93 0r 94 Octane and keep the Total Timing in Check,and Let HER Eat!!
    G 8)

  3. #3
    Senior Member MASTER BUILDER
    Join Date
    Apr 2003
    Brookings South Dakota
    11.0:1 On pump Gas (91 92 93 or 94? E85 definitely will), If you put the right cam in it. Look at it this way. Let's say you build it with 11.0:1 and it pings, so you drop the timing back to 30 degrees to get rid of the ping. You lost way more than you would gain if you would have lowered the compression ratio to 10.0:1 and ran 36 degrees timing.

    Or you just end up having to mix race fuel to cover it up. I'm not saying it is not possible, just giving you some worst case scenarios that many people run into.

    Good luck with your build.
    Competition Engines & Hardcore Engine Parts
    [email protected]

  4. #4
    I had 11.2 in my EMC motor all dyno pulls on 91 octane no pinging even down low I think it depends on your other parts selection and the rate that the timming comes in.

  5. #5
    Join Date
    Feb 2008
    Childers Australia
    my concern would be the 0.015'' min piston-head clearance

  6. #6
    Senior Member RACING JUNKIE oldandtired's Avatar
    Join Date
    Dec 2008
    Sugar Hill, GA
    Quote Originally Posted by desoto30
    my concern would be the 0.015'' min piston-head clearance
    Minimum of .035-.040 with steel rods. Aluminum rods need even more.

    Also need to check valve to piston.
    "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke

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 All Rights Reserved.

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