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Chevrolet Performance 12558060

Chevrolet Performance SBC Cast Iron Vortec Cylinder Head 170cc Intake Ports


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JEGS Small Block Chevy Cast Iron Vortec Cylinder Head
JEGS 555-514080

Chevrolet Performance SBC Cast Iron Vortec Cylinder Head 170cc Intake Ports $356.71
Out of stock
Small Block Chevy Cast Iron Vortec Cylinder Head
  • 170cc Intake Ports
  • 64cc Combustion Chambers
  • 1.940'' Int/1.500'' Exh Valves
  • .475'' Max Lift
  • Straight Plug
  • Assembled, Sold Individually
  • Chevrolet Performance 12558060 Details

    Cast Iron Vortec SBC Head

    Technical Specifictions:
  • Intake Valve: 10241743
  • Exhaust Valves: 12550909
  • Valve Spring Retainer: 10241744
  • Intake Seals: 10212810
  • Exhaust Seals: 12564852
  • Valve Springs: 10212811
  • Valve Locks: 24503856
  • Casting Number: 12558062

  • Specifications:

    Sold individually
    Cylinder Head Style
    Guideplates Included
    Rocker Arm Studs Included
    Accessory Bolt Holes Drilled
    Cylinder Head Finish
    Cylinder Head Material
    Cast iron
    CNC-Machined Combustion Chamber
    CNC-Machined Exhaust Runner
    CNC-Machined Intake Runner
    Damper Spring Included
    Exhaust Valves Included
    Heat Crossover
    Intake Valves Included
    Locks Included
    Machined for O-Ring
    Retainers Included
    Rocker Arm Nuts Included
    Rocker Arms Included
    Steam Holes Drilled
    Valve Guides Included
    Valve Seats Machined
    Valve Springs Included
    Valve Stem Seals Included
    Combustion Chamber Volume (cc)
    Intake Port Location
    Exhaust Port Location
    Oiling Style
    Through pushrod
    Intake Valve Diameter (in.)
    Exhaust Valve Diameter (in.)
    Valve Guide Material
    Intake Runner Volume (cc)
    Valve Seat Material
    Outside Diameter of Outer Spring (in.)
    Number of Springs Per Valve
    Retainer Material
    Lock Style
    7 degree
    Spark Plug Style
    Valve Stem Seal Style
    Manufacturer's Part Number:
    Shipping Weight:
    Package Height:
    Package Depth:
    Package Width:

    America's favorite high-performance cast iron small block cylinder heads offer big power and bigger value. Chevrolet Vortec Cylinder Heads' fast burn combustion chamber and high-velocity ports combine to produce big horsepower. Vortec Heads can be mildly ported for additional performance and milled up to .040'' for increased compression ratio. The Vortec Heads come with various intake and exhaust valve sizes to complement the high-velocity port design and your performance needs. Vortec Heads outflow Bow Tie Heads right out of the box and are a 20 to 40 horsepower bolt-on increase over earlier cast iron small block heads. Vortec Heads require a Vortec-style intake manifold due to an improved manifold mounting flange and gasket design and raised intake ports. Modifying the heads to accept early intake manifolds is not recommended. Vortec Cylinder Heads fit all 1955-Present small blocks except LT1/LT4 reverse coolant flow engines and current LS1-style engines.

    JEGS Easy Kits are designed by JEGS professionals so you get all the parts you need.

    Does Chevrolet Performance 12558060 fit your vehicle?

    Narrow Results


    • CC: 4638
    • Liter: 4.6
    • SubModel: SS
    • CUI: 283
    • EngineType: V8 ( 4.6 L / 283 )
    12558060 is rated 4.8 out of 5 by 4.
    Rated 5 out of 5 by from Heads fit perfect 87 5.7l block!
    Date published: 2018-03-20
    Rated 5 out of 5 by from Vortec Cylinder Head Pleased with the part. Found Jegs to be more expensive on the needed accessory parts: head gasket, new intake, intake gasket, and bolt kits. Bought those from Summit.
    Date published: 2017-04-28
    Rated 5 out of 5 by from Exactly as described! Product was delivered faster than promised and was great quality!! Don't bother shopping at any other parts suppliers, Jegs has it all.
    Date published: 2014-11-02
    Rated 4 out of 5 by from Great heads for the money; super-fast shipping Even though their price has risen substantially, these GM Vortec heads are still a great value compared to properly rebuilt GM heads or new aftermarket heads. And I'm not sure any of the Vortec copies flow as well at low lifts (up to .500") as the real GM versions. That said, my heads' valve travel was only approx .480" before the retainers hit the guide seals. I was able to increase that to approx .510" by fully seating the seals using an old seal and 1/2" socket. That's more than enough (including safety margin) for my cam's .451" valve lift.
    Date published: 2014-12-26
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    Is the Comp Cam 249-12-600-4 useful with this heads? Thanks 

    Asked by: Arechiga
    You can use this cam with these cylinder heads, Check the springs for coil bind.
    Answered by: Rusty B
    Date published: 2018-08-28

    I have to run a stock cast iron intake with a 4412 2 barrel is that possible with these heads? For a street stock class on a dirt oval

    Asked by: Adam54
    You will nee to find an intake that will fit these heads, we have aluminum. You may also need a carb adapter for the intake.
    Answered by: Rusty B
    Date published: 2018-07-26

    What diameter rocker studs does it come with?

    Asked by: DevWolf
    This will have 3/8" rocker studs.
    Answered by: Rusty B
    Date published: 2018-06-04

    question is what full roller rocker is compatible with these heads with stock height valve covers

    Asked by: 54mike
    We would recommend these rocker arms, but you will need to check the clearance as there are many different OEM valve covers available. https://www.jegs.com/i/JEGS-Performance-Products/555/20140/10002/-1
    Answered by: Rusty B
    Date published: 2018-05-25

    I have 10239906 heads i need to replace on my mercruiser 350 will these 12558060 heads work?

    Asked by: Bms30
    They will bolt on, but so not carry a marine certification if that is needed.
    Answered by: Rusty B
    Date published: 2018-04-03

    Are these sold as a set or individual

    Asked by: Aussiej3
    These are sold individually.
    Answered by: Jon Jegs Tech
    Date published: 2018-04-03

    Just purchased the vortec heads kit #12558060k2. I am now going to purchase the lunati cam#638-10120302 for sbc 350 and my question is upon ordering can i get springs and pushrods for the 507 lift??

    Asked by: Kevin Gathers
    Here is a valve spring option - http://www.jegs.com/i/JEGS-Performance-Products/555/514120/10002/-1 You will need to measure your pushrod length for the standard length that you have.
    Answered by: Rusty B
    Date published: 2018-03-13

    I know the stock Chevy vortec heads were prone to cracking in certain areas. Do these heads have a heavier casting, or are they the same as stock?

    Asked by: Big Dog76
    These are a later model design with some improvements to prevent cracking.
    Answered by: Rusty B
    Date published: 2019-01-12
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