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Speedmaster Cast Aluminum Cylinder Head Big Block Chevy 396 w/Hydraulic Flat Tappet Cam

746-PCE281.2034

Speedmaster

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Cast Aluminum Cylinder Head Big Block Chevy 396 w/Hydraulic Flat Tappet Cam
Cast Aluminum Cylinder Head
  • Big Block Chevy 396 w/Hydraulic Flat Tappet Cam
  • Assembled Head
  • 119cc Combustion Chamber
  • 305cc Intake Runner
  • Includes Valves & Springs
  • Port Dimensions: Int 2.5x1.77, Ex 2.05x1.82
  • Set of 2
    • Currently unavailable.
    This product is not available, please call customer service for options, at 1-800-345-4545.
    PCE281.2034 is rated 2.7 out of 5 by 3.
    Rated 5 out of 5 by from GREAT heads for little money I put these heads on my 468 big block chevy, I installed these oval port heads with my rectangle port intake and I am pleasantly surprised at the increased throttle response and overall improved drivability. Not to mention the 15 MPG average I am now enjoying. why spend thousands of dollars for those Big Name heads when these are equal at half the price. I have told many many people about this product and the $$$ savings I experienced. GREAT product and worth every dollar.
    Date published: 2021-08-23
    Rated 2 out of 5 by from be prepared to learn I watched a review video and these are really pretty well made for the money. That said, get ready to learn a lot about valve train geometry. I have a 1975 Mark IV 454. They aren't compatible with most stock components. You will need to get the speedmaster head bolts as recommended (8 are longer than stock), and they will work. The Jegs recommended speedmaster push rods did not work. These heads need longer pushrods, but you will need to get a pushrod length checker and figure it out. The recommended exhaust rods are too long, and the intakes are too short. Valve locations are slightly off from stock, and adjustable guide plates are needed, or you can use the old cut-and-weld approach on your stamped guide plates. Raised style guide plates are all I've found, but the speedmaster rods have such a long taper at the ends that they catch on the push rod guide plate. This will cause amazing pressure on the lifter. I'll give speedmaster credit--the rods didn't bend. But, it wiped a cam clean almost immediately. These may be great heads for the money, but be prepared to learn a lot about valve train operation and geometry. The only reason I would not recommend these heads to a friend is that none of my friends are engine builders. I'm out of time and money on this project and I'm going back to stock heads.
    Date published: 2021-05-01
    Rated 1 out of 5 by from INCORRECT PUSH RODS Not happy at all with the push rods that were sent with the heads. Intake rods way too short and exhaust rods are too long! These are the rods that were sent as part of the 396 head package, not something that I had an option of changing. VERY high raised exhaust ports cause current headers to hit the floor boards. Had lots of clearance with stock heads.
    Date published: 2023-04-17
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    • clientName_jegs

    Can you use stock rocker arms, pushrods and guide plates for these heads?

    Asked by: Ron69427
    The Speedmaster 746-PCE281.2034 cylinder heads will accept factory components.
    Answered by: jshook
    Date published: 2024-01-29

    Do these come as a set or each sold separately 

    Asked by: Madman18
    The Speedmaster 746-PCE281.2034 cylinder head set comes as a pair.
    Answered by: jshook
    Date published: 2023-05-10

    Are Exhaust ports in stock location or raised?

    Asked by: JCG1977
    These heads have a raised exhaust port.
    Answered by: Rusty B
    Date published: 2019-08-11

    Whats needed to run retrofit hydraulic roller cams ? i know you need different push rods etc but what as far as the heads go just different springs ?

    Asked by: danno2
    For the cylinder heads you would need to use the correct springs for the hydraulic roller application.
    Answered by: Rusty B
    Date published: 2018-01-03

    What kind of intake port do they have

    Asked by: Jr 572
    These are oval port heads.
    Answered by: Rusty B
    Date published: 2017-10-06
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    • clientName_jegs

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