Results 1 to 3 of 3

Thread: Max CFM from 049 or 781 BBC heads

  1. #1
    Junior Member APPRENTICE
    Join Date
    Oct 2004
    Posts
    19

    Max CFM from 049 or 781 BBC heads

    What is the max cfm I can get out of these heads after we port them or just clean them up? thx

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
    Posts
    459

    max CFM

    If I would do anything with those heads, it would be resizing seats and installing 2.19"/2.25' intake valves and 1.88" exhaust valves and open the bowls up under them.

    Add up the cost of this and some port work plus combustion chambers and then bronze guides and you might be close to a set of bare RHS steel 320 heads that will perform better with little work. The price for the remainder of components will be the same for any head.

    320 aluminum RHS or 325 Pro 1 Dart would be next step up. I have bought new castings on this site for $1200.

  3. #3
    Junior Member APPRENTICE
    Join Date
    Oct 2004
    Posts
    19
    ok thanks. I believe they can flow 290-300 cfm but for the amount of money involved in machine work I may look for used aftermarket...thx MM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
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