Hi-Tek Stainless Steel manifolds

Discussion in 'Who's Who' started by Coastal Manifold, May 20, 2009.

  1. Dasch Boat

    Dasch Boat Member GOLD Sponsor

    566
    Jan 3, 2010
    Long Island
    2003 380 DA
    8.1 Horizons ZF 63IV
    V Drives
    I also installed Hi-Tek headers at the end of the 2010 season, I used Mercruiser gaskets as I didn't like the way the supplied Chinese gaskets looked quality wise. I have two full seasons with no issues at all, I change the zincs every spring and check them prior to my autumn haul out and they show degradation so I know they are working. Allen recommended 25 lb/ft. of torque and as it was nearly impossible to get a torque wrench on most of the bolts we just guessed, no cracks or gasket issues. I can confirm Rod's claim of the way Allen stands by his product, the first set he sent me were for outdrive not V-drive engines so he replaced them no questions asked including shipping.
     
  2. Blackpearl49

    Blackpearl49 New Member

    4
    Nov 14, 2012
    Florida
    2006
    Volvo penta 8.1
    Dasch- wondering why so many post ref The SS cracking. I have to say, just as many post without problems. Is it the install? or just the luck of the draw. I really do like them and will decide by end of week, weather or not I am going to install them on my 8.1. Also, I am assuming I can use volvo penta gaskets? ...
     
  3. Dasch Boat

    Dasch Boat Member GOLD Sponsor

    566
    Jan 3, 2010
    Long Island
    2003 380 DA
    8.1 Horizons ZF 63IV
    V Drives
    Not sure why others cracked, when mine were installed my buddy said that we needed to tighten the bolts from the center out to the ends, don't know if that's the answer but two full seasons so far with no issues for me (knock on wood).
     
  4. Blackpearl49

    Blackpearl49 New Member

    4
    Nov 14, 2012
    Florida
    2006
    Volvo penta 8.1
    Do you remember what type of gaskets you used? I don't recall if the gaskets are included.
     
  5. rcknecht

    rcknecht Active Member

    Mar 23, 2009
    toms river,nj
    340 Sundancer 2001
    T 454 MPI
    They sent me felt gaskets, and I replaced them with Mercruiser gaskets. I don't know how the mechanic tighten my bolts. He used SS lock washers, and I provided SS bolts. One set has been fine, no cracks, the other I had problems. I did have a constricted RW intake hose which cased my engine to over heat, but the manifolds that cracked where the two in board manifolds, one on the engine that over heated and the other not on that engine...

    One plus of these manifolds, is ther is no chance of water intrusion, as the RW exits very far from the manifold...
     
  6. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    If there is a metalergist on the site could they comment about SS and clorides in salt water what what effect they have on each other at different temperatures.
     
  7. Bucit

    Bucit New Member

    Mar 12, 2010
    St. Petersburg Florida
    2005 280 Sundancer
    2004 SPD-104 Achilles w/ 8hp Yamaha
    Twin 4.3 MPI's with Alpha drives.
    The gaskets that Allen sent me were very close to Mercruisers and actually fit better so I used them and returned the OEM ones.
     

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