Recommendation for rebuilt cylinder heads

Discussion in 'Sport Cruisers' started by britandy, Jan 10, 2021.

  1. britandy

    britandy New Member

    27
    Aug 19, 2019
    340 Sundancer 2000
    Mercrusier 7.4 MPI, inboard, V drives
    Last winter when I replaced my exhaust manifolds, elbows and risers, I noticed severe corrosion in some of the exhaust ports, but at that time did not want to get into removing/replacing heads. Of course this issue bugged me all season and I decided this winter to replace the heads. Today I removed the heads from the port engine and took a few pictures for all to see.
    IMG_8178.jpg IMG_8179.jpg IMG_8180.jpg
    I am pretty sure the heads are toast, corrosion is so bad in a couple of ports that chunks of metal flaked off.
    I wonder if anyone has a recommendation for a supplier for rebuilt/remanufactured heads?
    My engines are 7.4 MPI L29 Gen VI. They are 20 years old.

    I have owned the boat for about 18 months. It appears moisture sits in the exhaust manifolds after the engines are turned off. In fact when removing my only one year old manifolds there were tiny pools of water sitting in each manifold exhaust port. I had found the same when I removed the old ones last winter. I assume a poor design that unfortunately over many years leads to this corrosion. The water must be condensate, I think? With all new manifolds, risers, elbows and Mercruiser gaskets I don't see where else it would come from.
     
  2. HawkX66

    HawkX66 Active Member

    436
    Jul 27, 2020
    SE Virginia and Mass
    "Tread Knot"
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    I have a mint set of heads from my L29 that I just had redone if you're interested. All painted already too. I'll sell them for very short money. I decided to go with a different casting for more compression. Where are you?

    IMG_20201109_164432.jpg
     
    Last edited: Jan 11, 2021
  3. britandy

    britandy New Member

    27
    Aug 19, 2019
    340 Sundancer 2000
    Mercrusier 7.4 MPI, inboard, V drives
    I am in Pasadena Maryland. What are the casting numbers? 279?
     
  4. HawkX66

    HawkX66 Active Member

    436
    Jul 27, 2020
    SE Virginia and Mass
    "Tread Knot"
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    279 are what I replaced them with. These are casting # 10114156.
     
  5. britandy

    britandy New Member

    27
    Aug 19, 2019
    340 Sundancer 2000
    Mercrusier 7.4 MPI, inboard, V drives
    HawkX66, thanks for the offer but I will need 279 heads.
     
  6. HawkX66

    HawkX66 Active Member

    436
    Jul 27, 2020
    SE Virginia and Mass
    "Tread Knot"
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    Like me, it's what you would like, but not what you need. I can completely appreciate that though. Good luck in your search.
     
  7. Shenanigans77

    Shenanigans77 Well-Known Member

    265
    Feb 17, 2020
    Lk St. Clair
    2003 320 Sundancer
    Twin 6.2 Mercruiser Bravo III
  8. britandy

    britandy New Member

    27
    Aug 19, 2019
    340 Sundancer 2000
    Mercrusier 7.4 MPI, inboard, V drives
    Shenanigans77, thanks for your recommendation. They are out of my budget, new would be nice but I have been looking at rebuilt/reconditioned heads, they are around $500 a piece.
     
  9. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    That link is for a pair for $1080. Very good price
     
    techmitch and Chris-380 like this.
  10. britandy

    britandy New Member

    27
    Aug 19, 2019
    340 Sundancer 2000
    Mercrusier 7.4 MPI, inboard, V drives
    scoflaw, you are correct, I missed that! That is a good price then. So far I am finding out that for the new heads, the castings are made in China, probably no big surprise there. Now that might not be an issue, but something to consider. My thinking is if I go with rebuilt then the castings most likely would be true GM cast and US made. Just a theory!
     
  11. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    From what I've read EQ has a pretty good rep.
     
  12. Shenanigans77

    Shenanigans77 Well-Known Member

    265
    Feb 17, 2020
    Lk St. Clair
    2003 320 Sundancer
    Twin 6.2 Mercruiser Bravo III
    Eq heads are cast at a foundry in New Zealand. A lot of GM’s current cast heads come out of Mexico
     
  13. britandy

    britandy New Member

    27
    Aug 19, 2019
    340 Sundancer 2000
    Mercrusier 7.4 MPI, inboard, V drives
    shenanigans77, that is good to know, and I really appreciate your comments. As you already know replacing heads takes some research. These EQ heads are looking more attractive.
     
  14. britandy

    britandy New Member

    27
    Aug 19, 2019
    340 Sundancer 2000
    Mercrusier 7.4 MPI, inboard, V drives
    shenanigans77, another question for you then.....did you use all Mercruiser gaskets (head, intake, rocker covers) or go with any Fel Pro?
     
  15. Shenanigans77

    Shenanigans77 Well-Known Member

    265
    Feb 17, 2020
    Lk St. Clair
    2003 320 Sundancer
    Twin 6.2 Mercruiser Bravo III
    C3CAC15D-F62D-4E39-A31A-924E7A01BAA5.jpeg D0156A13-8132-4C4F-83BC-EB11D51513D6.jpeg 70A1F8B1-5793-4A8A-AFBD-6EE273E232A1.jpeg K 21872066-0935-48E2-AB0F-1DCA838F5CAC.jpeg Been there, I feel your pain. I still had honing marks at 1000hrs so opted to just go new top ends. They use zero oil and just purr. Im hoping for another 1000 hrs.
     
    Chris-380 likes this.
  16. Shenanigans77

    Shenanigans77 Well-Known Member

    265
    Feb 17, 2020
    Lk St. Clair
    2003 320 Sundancer
    Twin 6.2 Mercruiser Bravo III
    Felpro marine....Superior to the gm graphite imo. I have the mpi motors so I went with the metal/rubber felpro instead of the plastic/rubber stock GM for the intake. Replaced the head bolts with ARP as well.
     
    Last edited: Jan 13, 2021
    Chris-380 likes this.
  17. britandy

    britandy New Member

    27
    Aug 19, 2019
    340 Sundancer 2000
    Mercrusier 7.4 MPI, inboard, V drives
    Thanks, again I appreciate all your comments. I am getting close to hitting that buy button! I will look for the Fel Pro marine gaskets. I like that you painted the heads as well. Had not figured that in, another job to do!
     
  18. 370Dancer

    370Dancer Well-Known Member

    Oct 2, 2006
    Florida - Alabama
    1998 370 Sundancer
    380hp MAG MPI Gen VI with V drives
    Talkin out my butt here, but Scof, with a MAG MPI, shouldn't those be rectangle ports? Pic on Ebay shows ovals.
    I'm right behind him for my tired Port side......
    BBC heads on Ebay.jpg
     
  19. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    It's an oval port. Jegs wants 7 plus per bare head. So that's a hellava deal
     
  20. 370Dancer

    370Dancer Well-Known Member

    Oct 2, 2006
    Florida - Alabama
    1998 370 Sundancer
    380hp MAG MPI Gen VI with V drives
    So, is it ok to pull a head with rectangle ports and replace with ovals?
     

Share This Page

Show Sidebar