User Tag List

Thanks Thanks:  0
Likes Likes:  0
Results 1 to 4 of 4
  1. #1
    Join Date
    Mar 2005
    Location
    tulsa, ok
    Posts
    375
    Thanks (Given)
    2
    Thanks (Received)
    2
    Likes (Given)
    67
    Likes (Received)
    12
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Looking for some head.....

    Info.. I need a set of stock heads for a '91 merc xr4 'fat block' part number 187893. Or, if you know what cc these heads are, that would be great. Thanks
    '94 Bullet 20XD W/225 Merc ProMax


  2. #2
    Join Date
    Apr 2004
    Location
    Florida Keys
    Posts
    3,043
    Thanks (Given)
    44
    Thanks (Received)
    147
    Likes (Given)
    380
    Likes (Received)
    801
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Fat block will let you use any 2.5 head....I’d imagine somewhere in the 34-37cc range with that 3.375” bore would put you where you want to be. Should be able to use 2.5 head gaskets too....so you can fine tune your compression if you’re close with thin/thick gaskets.


    '95 STV "The Blue Goose"


  3. #3
    Join Date
    Mar 2005
    Location
    tulsa, ok
    Posts
    375
    Thanks (Given)
    2
    Thanks (Received)
    2
    Likes (Given)
    67
    Likes (Received)
    12
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That good info, thanks. We're looking for about 125-130 lbs compression. From I've gathered so far, we were thinking a 32cc 2.5 head should put us close. I'd rather it be 130-135 than be below 120.
    '94 Bullet 20XD W/225 Merc ProMax


  4. #4
    Join Date
    Sep 2017
    Location
    Ashland city tn
    Posts
    4,774
    Thanks (Given)
    226
    Thanks (Received)
    353
    Likes (Given)
    1177
    Likes (Received)
    1115
    Mentioned
    4 Post(s)
    Tagged
    1 Thread(s)
    What is your compression now ? My 2.4 200 went from 120ish to 135ish with 33cc heads

Similar Threads

  1. head gasket and cylinder head
    By drtyTshrt in forum Technical Discussion
    Replies: 1
    Last Post: 03-26-2017, 08:47 PM
  2. EARLY opti head, Low Compression head, Pro XS head on 3.0L
    By 150aintenuff in forum Four Stroke and Direct Injected Two Stroke Engines
    Replies: 0
    Last Post: 07-20-2016, 11:26 PM
  3. Head torque on 4cyl mercruiser 488 the one with the ford BB head
    By baddjonny in forum Technical Discussion
    Replies: 10
    Last Post: 07-15-2011, 11:02 AM
  4. OMC Tech: 2.7 head repair?? filling head gouges
    By rebible in forum Technical Discussion
    Replies: 3
    Last Post: 07-13-2008, 09:44 PM
  5. Replies: 5
    Last Post: 08-05-2007, 03:36 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
  •