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Vortec Heads & Headers

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BigBadBowTie, Jun 2, 2000.

  1. BigBadBowTie

    BigBadBowTie 1/2 ton status

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    Just want to clarify. I know that you need a different manifold for the vortec heads. But it's my understanding that the exhaust manifolds/headers are unchanged? I have a set of JBL Block Hugger Headers on there now, the heads are 194's off of a mid 70's Monte Carlo, PLEASE TELL ME THEY'LL FIT!

    Rick
    86 K-5
    http://www.coloradok5.com/RMcPherson.htm
     
  2. Burt4x4

    Burt4x4 3/4 ton status

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    Not positive but I do remeber reading Vortec heads ARE the same!!

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
     
  3. BI U JIMMY

    BI U JIMMY Registered Member

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    I have a set of vortec heads on my engine and you are correct about the intake being different.The headers that fit the old small blocks will bolt right on the vortecs
     
  4. BillR

    BillR 1/2 ton status

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    What IS different about the Vortec heads? There's a set on e-bay, and I was thinking...

    Blazin' in Flagstaff
     
  5. BigBadBowTie

    BigBadBowTie 1/2 ton status

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    This from the tech dept @ www.sdpc2000.com

    These
    are
    cast iron GM production line heads that originally were used on trucks
    that had the L31 vortec engine. These heads are sold fully assembled or
    bare (though the assembled heads are much cheaper). These heads can be
    used on all small block engines except the LT1, LT4, and LS1 style
    engines. The Vortec head offers excellent flow characteristics out of the
    box and has great low and mid-range power at a fraction of the price of
    other heads that flow this good. Much of the increased power made by the
    Vortec design is because of its improved intake runners. These runners
    are located .250" higher than those in other GM heads. Because of this
    raised port a unique intake manifold with corresponding ports must be
    used. The intake is held down with eight 5/16X1.75" bolts, and requires
    matching intake gaskets to ensure a proper seal and correct port matching.
    These heads come factory assembled with GM production line valves and
    springs as well as stock style pressed in rocker arm studs. The springs
    installed on these heads can accept cams with lifts of no more than .450".
    They accept stock style head gaskets and head bolts. These heads require
    that you run the 87 and later self-aligning style rocker arms because they
    have no provisions for pushrod stabilization. These heads require the use
    of late model center-bolt valve covers or GM part number 24502540 valve
    cover adapters. The Vortec head will not work with early style intake
    manifolds. The intake port miss-match causes severe flow interruption and
    sealing problems. Drilling of the intake deck to accept early manifolds
    is discouraged by us because of the lack of intake deck thickness. When
    these heads are redrilled we see severe problems with bolt holes stripping
    out and problems with persistent vacuum and coolant leaks. The Vortec
    head design is sure to be one of the best to ever roll off the GM assembly
    line.


    Rick
    86 K-5
    http://www.coloradok5.com/RMcPherson.htm
     
  6. BillR

    BillR 1/2 ton status

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    Thanks, BigBad! Good information there.

    Blazin' in Flagstaff
     

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