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Results 1 to 16 of 16
  1. #1
    Join Date
    Nov 2008
    Location
    Long Beach, CA
    Posts
    161

    Default Hole in exhaust x-over

    Hey guys running the boat today trying to get full power and I blew a pinhole in the intake manifold right in the bottom of the cavity the thermostatic choke would be if I had one. I plan on dremeling the entire cavity clean, then filling with JB weld. Any suggestions or thoughts, other that replacing the manifold? Ive used JB weld on exhaust cross overs on big block buicks with success.

    Thanks, will

  2. #2
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    12,061

    Default Re: Hole in exhaust x-over

    Not sure that alone will last. I'd try a piece of metal AND the J B Weld held by screws (drill and tap the manifold).

    Jeff

  3. #3
    Join Date
    Nov 2008
    Location
    Long Beach, CA
    Posts
    161

    Default Re: Hole in exhaust x-over

    not a bad idea jeff. ill take a look at it once the weather clears up.

    will

  4. #4

    Default Re: Hole in exhaust x-over

    How did you find that??? Man, that thing must be rusted out!! Pics?

  5. #5
    Join Date
    Jan 2011
    Location
    North Lake Tahoe and Delta
    Posts
    233

    Default Re: Hole in exhaust x-over

    I'd replace the manifold. Being cheap might just cost you an engine re-build. Used manifolds on e-bay are cheap.
    http://www.ebay.com/itm/CHRYSLER-MAR...#ht_500wt_1202

  6. #6
    Join Date
    Nov 2008
    Location
    Long Beach, CA
    Posts
    161

    Default Re: Hole in exhaust x-over

    It was pretty easy, Sounded like an exhaust leak. I heard it when i moored up. Lifted the hatches an just felt around. I will pull the carb and get some pictures this weekend.

  7. #7
    Join Date
    Nov 2008
    Location
    Long Beach, CA
    Posts
    161

    Default Re: Hole in exhaust x-over

    I would rather block the exhaust passages all together if I pull the intake.

    will

  8. #8
    Join Date
    Nov 2005
    Location
    Chi West, IL, USA
    Posts
    551

    Default Re: Hole in exhaust x-over

    Quote Originally Posted by buick430 View Post
    I would rather block the exhaust passages all together if I pull the intake.

    will
    Will,
    Good idea if you are going to run the quarter mile at the strip. Maybe not so good for marine engine economy.
    Blocking the heat crossover would result in longer warm up time and use more fuel.

    I'll 2nd Jeff's fix.

  9. #9
    Join Date
    Jan 2011
    Location
    North Lake Tahoe and Delta
    Posts
    233

    Default Re: Hole in exhaust x-over

    Chrysler got it right in early big blocks. When the thermostat is closed, water is routed under the carb and then back to the pump. The flow to the intake is closed off once the t-stat opens.

    Unlike a car there is no heat riser in a boat, so the exhaust crossover in the intake does little to help warm up.

  10. #10
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    12,061

    Default Re: Hole in exhaust x-over

    Excellent point! (Wish I had thought of that....)

    The only reason I can think of why NOT to plug that sucker up is IF you're NOT running an electric choke--it needs the heat to open the older types. ack in my racing days, we used to pour molten lead in there to block 'em off.

    Jeff

  11. #11
    Join Date
    Nov 2008
    Location
    Long Beach, CA
    Posts
    161

    Default Re: Hole in exhaust x-over

    Yea I have done it on a couple street daily driven cars that I honestly noticed no difference (even a performance gain!). My carter carbs dont even have choke plates or linkage installed, Not cold enough in southern california! I will try the screw and JB weld. I reall dont want to pull the intake either way.

    will

  12. #12
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    12,061

    Default Re: Hole in exhaust x-over

    Don't blame you. It's a job, even though the distributor doesn't have to come out.

    Jeff

  13. #13
    Join Date
    Nov 2008
    Location
    Long Beach, CA
    Posts
    161

    Default Re: Hole in exhaust x-over

    Yea on top of that my left wrist is in a cast.

    will

  14. #14
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    12,061

    Default Re: Hole in exhaust x-over

    Ugh! Good luck.

    Jeff

  15. #15
    Join Date
    Jan 2011
    Location
    North Lake Tahoe and Delta
    Posts
    233

    Default Re: Hole in exhaust x-over

    FWIW ask your parts guy for a propane intake gasket set. it will be already blocked off:

    Top propane
    bottom gas

  16. #16
    Join Date
    Nov 2008
    Location
    Long Beach, CA
    Posts
    161

    Default Re: Hole in exhaust x-over

    update, I filled the entire cavity with JB weld. So far so good. I have % hours on the repair at heavy load all looks well.

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