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Speedmaster Cast Iron Cylinder Head Small Block Ford 389/302/351W

746-PCE281.1761

Speedmaster

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Cast Iron Cylinder Head Small Block Ford 389/302/351W
Cast Iron Cylinder Head
  • Small Block Ford 389/302/351W
  • Bare Head
  • 60cc Combustion Chamber
  • 180cc Intake Runner
  • 1.940 in. Intake Valve
  • 1.600 in. Exhaust Valve
  • 20 deg. Valve Angle
  • Sold Individually
    • Currently unavailable.
    This product is not available, please call customer service for options, at 1-800-345-4545.
    PCE281.1761 - Speedmaster Bare Cylinder Heads is rated 3.3 out of 5 by 3.
    Rated 4 out of 5 by from Pretty Decent head Both boxes delivered in were pretty bad condition. Check part over. Also 1.6 exhaust valves don't fit. They are to big, I used 1.5 and did a leak down test.They were good. Overall good quality, I haven't started the engine yet.
    Date published: 2021-03-22
    Rated 4 out of 5 by from Nice looking heads Bought heads for replacement of stock heads because I would have about the same amount in old heads after machine work. Read a lot of bad reviews but they look fine and this is only a street engine, not a full blown race engine. Only found one small spot that will need a little attention in one exhaust port. Bottom line I see nothing wrong with Pro Comp or Speedway heads for a street engine and they are going on a restoration I`m doing and the cast iron heads fit the build just fine.
    Date published: 2016-05-30
    Rated 2 out of 5 by from You get what you pay for! My customer ordered a pair of these because he couldn't wait months for the backordered Darts that he wanted. These are not made for 1.6" exhaust, but only 1.5". Jeg's made good on that but the hardened seats are too small to recut that big so I had to use 1.55" valves. Ports are pretty crude and should be gone over. Understand that any work on these voids the warranty. These heavy heads were shipped in very thin cardboard boxes that were pretty beat up. When opened there were deep gouges on the edges (no problem) of the deck surface and across the valve cover rail (problem). That I fixed with epoxy. I'm not sure if the damage was from the factory or shipping but we decided to work with what we had instead of returning for more of the same. Pros - inexpensive, available. Cons - heavy, crude, damaged, not as advertised.
    Date published: 2019-05-16
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    Can stock rockers off GT40p heads be used on these?

    Asked by: rfresh71
    The Speedmaster 746-PCE281.1761 cylinder head is not compatible with the GT40 rocker.
    Answered by: jshook
    Date published: 2022-08-23

    What type of roller rockers do these use, pedestal or stud mount and what size 5/16 or 3/8? 

    Asked by: Rtford96
    This will use a 7/16" stud pedestal mount style rocker arm.
    Answered by: Rusty B
    Date published: 2019-07-18

    Are these drilled to accept the 1/2" 351w head bolts?

    Asked by: chevy8guy2010
    Yes, these heads will use 1/2" fasteners.
    Answered by: Rusty B
    Date published: 2023-01-05

    What length valves do these heads require for 1.8 instaii?

    Asked by: TGUY
    This head should take a stock length valve, they are a 1.94" and a 1.6" diameter valve.
    Answered by: Rusty B
    Date published: 2020-05-04

    What are the flow numbers of these heads?

    Asked by: LG Brandon
    These are the approximate flow numbers; LIFT INTAKE EXHAUST 0.100 59.4 50.4 0.200 108.0 102.2 0.300 154.9 145.9 0.400 203.5 159.8 0.500 239.8 166.9 0.600 260.3 169.8 0.700 268.2 170.0 0.750 269.9 170.4
    Answered by: Rusty B
    Date published: 2022-12-25

    Can these heads be purchased complete with valves, seals, springs, retainers and locks for flat tappet marine application for 351w cruiser, 4400 rpm max?I would be in the market for a package deal.

    Asked by: Trojanyacht
    No, the cast iron heads is only available as a bare casting, the aluminum heads are available ready to run.
    Answered by: Rusty B
    Date published: 2023-09-12
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    Some parts are not legal for use in California or other states with similar laws / regulations

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