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Thread: GLM manifolds

  1. #1
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    GLM manifolds

    Have you had success with the GLM manifolds?

    I would love to hear some "good" reports after all the "Good Luck Marine" stories I've heard in my research. Or, have I just uncovered the "vocal few" that make this product look suspect.

    Truly I would like to buy these as they look good and the pricing is great...but I'm not looking to do this twice (or more). I have heard about poor mating surfaces, cracks from poor casting, poor repairs made on new manifolds from the factory, non uniformity, and porosity issues in general.

    Their Customer service dept. seems to be top notch in solving these isues....but there seems to be too many issues to solve in the first place.

    I would appreciate hearing any experiences with the GLM manifolds/risers.

    FYI - my application is a 4.3 V6 with diverters (there ain't much on the market to choose from)
    Sean Conroy,
    1964 Formula Jr. (hull #2) project

    1972 Greavette Sunflash III
    1981 Kavalk Mistral project

    "A man can accomplish anything... as long as he doesn't care who gets the credit."

  2. #2
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    1) They're lighter than cast iron.

    2) ................

    3) I can't think of any more.
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  3. #3
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    GLM's are great for the money. They have internal runners like the Merc 496 manifolds do and they are about 30lbs lighter each. I've used them for about 6 years now.

    If you only need them for BBC I could set your world up.
    http://www.supernova19.com/resurrect...s_for_sale.htm
    A winner is just a loser that got up and did it one more time.
    1959 Biesemeyer - 4pt Hydro Drag - 2013 ACBS Winner - Best Race Boat
    1967 Nova Marine - SuperNova24 - ACBS Winner - 2012 Best Race Boat - 2016 Peoples Choice & Best Non Wood
    1972 John Allmand - Nova 19
    1972 John Allmand - Nova19 (#2)
    1982 PolarKraft -Jonboat - Crab Killer

  4. #4
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    Bought a set of aluminum GLMs for my 502 several years ago. I have had no issues whatsoever. They were light, as stated, had good workmanship, saved me a ton of dough, and continue to do the job. Oh, they don't rust.
    I replaced the anodes this year. They were about 1/3 gone, easy replacement.

    I would definitely buy them again.

    Bob
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

  5. #5
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    I switched to GLM's this season. I only have a couple of hours on them, but I'll echo what everyone else has said. They seem pretty nice to me compared to the stock cast iron Merc units I removed.
    If you on the sho', then you sho' not me, yo.

    1997 18 Classic 350 MAG/MPI Bravo -
    2004 Formula 27PC T-350 MAG/MPI Bravo III

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    On my 3rd set on different boats over the last 15 years and never had a problem. I would not buy anything else.
    Nick
    1994 22' Classic-454 B1 Red & white
    1981 13' Whaler sport(original owner)
    South Tampa Bay, FL "May I mamoo dogface to the banana patch?"

  7. #7
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    I've had a set on my 21' sbc Scarab for 7 years now and never had a issue.
    I'm from an era when SBC only meant "small block chevy".

  8. #8
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    woobs... most of the comments so far are in regards to the Aluminum GLM's. I know they make cast iron too. Keep that in mind.

    I want to get a set of aluminum ones for my ZXO but I can't figure out if you can get the taller set in aluminum.

  9. #9
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    I'm definately looking at the aluminum ones.
    I'm glad so many here have had good experiences with the GLM.

    My local guy has the aluminum GLM at $1250 CAD plus tax.
    The Hi Tek (very cool Stainless Steel) are $ 2000 to my door.
    http://www.cpperformance.com/c-1457-v6-chevy.aspx


    Decisions, decisions.
    Sean Conroy,
    1964 Formula Jr. (hull #2) project

    1972 Greavette Sunflash III
    1981 Kavalk Mistral project

    "A man can accomplish anything... as long as he doesn't care who gets the credit."

  10. #10
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    [ QUOTE=$originalposter]{$pagetext}[/QUOTE]

    I want to get a set of aluminum ones for my ZXO but I can't figure out if you can get the taller set in aluminum

    I just got off the phone with Dennis Moore...apparently the taller ones come in cast iron only.
    Sean Conroy,
    1964 Formula Jr. (hull #2) project

    1972 Greavette Sunflash III
    1981 Kavalk Mistral project

    "A man can accomplish anything... as long as he doesn't care who gets the credit."

  11. #11
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    $1200 cdn for al glms? I paid half that

    B
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

  12. #12
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    Now that's good information!

    I saw them for about 1/2 and then called the local dealer...
    After he told me the price I assumed I had made a mistake and the price I saw must have been for each unit....with the total cost so close to the Hi Tek, it opened up the decision again.

    At half the price it's a no brainer. I'll call again tomorrow and see who made the mistake. Me or Him.

    Thanks,
    Sean
    Sean Conroy,
    1964 Formula Jr. (hull #2) project

    1972 Greavette Sunflash III
    1981 Kavalk Mistral project

    "A man can accomplish anything... as long as he doesn't care who gets the credit."

  13. #13
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    Didn't mean to mislead, but my application was for a V8-502. I just saw that yours was for the V6. I would find the manufacturer's model number for your app, then scour the internet for price.

    Good luck,
    Bob
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

  14. #14
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    still, shouln't be double...
    probably less. At any rate, we'll find out today.

    S.
    Sean Conroy,
    1964 Formula Jr. (hull #2) project

    1972 Greavette Sunflash III
    1981 Kavalk Mistral project

    "A man can accomplish anything... as long as he doesn't care who gets the credit."

  15. #15
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    Woobs, FYI, I am heading to Toronto in early December if you need anything brought.

    Ken

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