Register now to get rid of these ads!

Hot Rods 1954 331 combustion chamber size

Discussion in 'The Hokey Ass Message Board' started by Henry Biesterfeldt, Jan 14, 2022.

  1. Hello and thanks for the add.

    Question; what is the combustion volume of a stock 1954 331 Chrysler Hemi head # 1486833 ?

    thanks,
    Hank
     
  2. gimpyshotrods
    Joined: May 20, 2009
    Posts: 19,927

    gimpyshotrods
    ALLIANCE MEMBER

    Not sure. The best bet would be to measure.

    If they are anything like later 354 chambers, they vary. I always spend a little time equalizing them. Not totally necessary, but it makes me feel better.
    PXL_20210912_194721032.jpg
     
    stillrunners and kidcampbell71 like this.
  3. I'm thinking around 100cc.
    What are you aiming for?
     
  4. The 392's that I had were 105cc if my memory hasn't failed me. There were usually decked and ended up slightly less than 100cc. The 354 has a 1/16 smaller bore but the racers used to swap heads alot. What I don't know is if they had different domes cut for the pistons. On a fuel motor that had a 180 down piston, it wouldn't have made any difference. This info is only a starting point for you. Sorry I don't have better info.
     

  5. I need to order custom pistons and the order sheet asks for that information but honestly I can’t find it nor do I know how to measure it. Can you help?
     
  6. Marty Strode
    Joined: Apr 28, 2011
    Posts: 6,735

    Marty Strode
    Member

    I had 55-331 heads, that were 109 cc, 392's were 117, as I remember.
     
    Pist-n-Broke likes this.
  7. gimpyshotrods
    Joined: May 20, 2009
    Posts: 19,927

    gimpyshotrods
    ALLIANCE MEMBER

    Where are you located?

    There are members spread across the globe. Someone might be nearby that can measure them.

    Either that or a good race car shop.
     
  8. You need a burette and some perspex/lexan etc. sheet.
    Look up cc'ing combustion chambers on youtube, I'll bet there are plenty of how to's.
     
  9. gimpyshotrods
    Joined: May 20, 2009
    Posts: 19,927

    gimpyshotrods
    ALLIANCE MEMBER

    Here's a video:
     
  10. gimpyshotrods
    Joined: May 20, 2009
    Posts: 19,927

    gimpyshotrods
    ALLIANCE MEMBER

    The last set of 354 heads that I did were 110-111cc after cleanup.

    I won't chase the last cc. It is too easy to go too far, and it is not worth it.
     
    SEAAIRE354 likes this.
  11. PotvinV8
    Joined: Mar 30, 2009
    Posts: 209

    PotvinV8
    Member

    IMG_7882.JPG IMG_7884.JPG IMG_7887.JPG

    My '53 331 Chrysler heads came in around 98cc.
     
  12. SEAAIRE354
    Joined: Sep 7, 2015
    Posts: 424

    SEAAIRE354
    Member

    Here is a 331 triple nickel head. This particular chamber was rite at 100cc. I did a industrial 354 next and it was 105. A7126448-7485-4E53-B475-037578A5353C.jpeg
     
    stillrunners likes this.
  13. If you are desiring anything above 9-1, you will need the deck height of the block and the depth of the chamber. Because hemi's have such a tall piston, every measurement is very important. You need to know what a piston designer knows to get it right. It is possible with custom maker to order 1 piston and see how it fits and then order the rest to match. That's a little pricey to do that. Very few people get it right the 1st time. If you are unfamiliar with all of this, I would see if there is a video that someone is measuring an early hemi to reference from.
     
  14. gimpyshotrods
    Joined: May 20, 2009
    Posts: 19,927

    gimpyshotrods
    ALLIANCE MEMBER

    This is why I mentioned that they vary, and that measurement is critical. I have seen the same casting number, with the same valve cover to deck measurement, come up with a different cc measurement.

    Given the bore and stroke of the early Hemi, 10cc is about one-point in static compression ratio change.

    Hemis are generally more tolerant of a slightly higher compression ratio than a wedge-chamber engine, due to the chamber shape, but there are limits to what pump gas can do.

    Ross has been making the pistons that I use in Hemis. I have never had an issue with their work. First try, every time.
     
    MRW1994 and SEAAIRE354 like this.
  15.  
  16. That’s who I plan on using is Ross.
     
  17. gimpyshotrods
    Joined: May 20, 2009
    Posts: 19,927

    gimpyshotrods
    ALLIANCE MEMBER

    Their form is comprehensive, and they know what they are doing.

    Measure, or have measured all eight chambers.

    Give them the smallest number if they differ.
     
    MRW1994 likes this.
  18. 73RR
    Joined: Jan 29, 2007
    Posts: 6,710

    73RR
    Member

    A lot depends on the c/r you are wanting and how much leeway you build in. If you cannot measure the chambers then its a crap shoot. Although the heads should be around 105 it is never a given unless you know for a fact that the heads have never been cut. If you cannot measure them then error on the safe side and use 108cc or 110cc.
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.