If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Follow us on Facebook Follow us on Twitter
Results 1 to 2 of 2
  1. #1
    My Boats:
    was a 1989 scarab
    Join Date
    Mar 2001
    Las Vega NV USA

    question on swapping SBC400 to 350 heads

    My heads have leaky valve guides and does not have harden seats. I have a fresh set of 350 truck heads and was thinking about putting them on my 400 block. What do I have to change ? ie: what Head gasket do I use a 350 or a 400? What about the stem holes? The 400 heads are out of a 1970's car and the 350 heads are out of a early style 350 ( larger holes for the assories) truck. I know i will have to drill out my brackets but mostly don't know what gasket to use. Any help or insite would be great


  2. #2
    Registered SteveS's Avatar
    My Boats:
    Warlock 27WC F1-36
    Join Date
    Feb 2001
    Verona Beach, NY USA
    You will need to use the 400 gasket, and drill the steam holes(you can use the gasket as a template). The performance characteristics or the engine may change. The 400s typically used a larger cc head then the 350. You will most likely see an increase in compresion.

Similar Threads

  1. A/C Question for the F-350
    By BajaRunner in forum General Q & A
    Replies: 14
    Last Post: 08-06-2008, 11:04 AM
  2. What kind of heads for a SBC 350?
    By Formula78 in forum General Q & A
    Replies: 8
    Last Post: 01-24-2004, 06:58 PM
  3. 350 stock heads verses vortec
    By sonic28 in forum General Q & A
    Replies: 35
    Last Post: 12-19-2003, 04:40 PM
  4. ot: Help Timing question for sbc400
    By scarabrick in forum General Boating Discussion
    Replies: 1
    Last Post: 07-29-2002, 06:53 PM
  5. SBC 400 heads to a 350 head exchange question
    By scarabrick in forum General Q & A
    Replies: 4
    Last Post: 07-10-2002, 10:48 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
All times are GMT -5. The time now is 07:06 PM.
Powered by vBulletin® Version 4.2.0
Copyright © 2016 vBulletin Solutions, Inc. All rights reserved.
Search Engine Optimization by vBSEO 3.6.1
Original Poster In Postbit provided by Original Poster In Postbit v1.0.0 (Free) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Copyright 2011 OffShoreOnly. All rights reserved.