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Speedmaster 2-Piece Modular Ram Air Intake Manifold GM LS1

746-1-148-050


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2-Piece Modular Ram Air Intake Manifold GM LS1
2-Piece Modular Ram Air Intake Manifold
  • GM LS1
  • 98 mm Throttle Body Bore with 4-Bolt Flange
  • Idle-7,000 RPM Range
  • Non-EGR
  • Aluminum
  • Polished Finish
  • Fuel Rails Included
  • Sold Individually
  • Currently unavailable.
    This product is not available, please call customer service for options, at 1-800-345-4545.

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    1-148-050 is rated 2.0 out of 5 by 3.
    Rated 4 out of 5 by from Requires some work, but overall is a good intake Like most aftermarket parts this intake requires a little massaging for correct fitment, you either have to use a low profile valley cover such as ICT Billet 551629 or if using a factory gen 3 valley cover with knock sensors you may have to grind the bottom off each intake runner off a little. You also may have to grind the top ridge off the intake runner to clear the lip that is above the mounting surface on the head. If using truck brackets with the top mount alternator you will have to get a lower profile 90 degree AN fittings then are included on the fuel rail crossover or notch the alternator and slightly bend the AN fitting. But overall seems like a good intake, seems to make better torque then a sheet metal intake based off the seat of the pants feel, Idle quality and fueling requirements remained very similar to a factory truck manifold.
    Date published: 2022-08-29
    Rated 1 out of 5 by from Junk Intake is straight junk!!! Do not buy!! First problem is it hits the valley cover so it won't sit down the way. Next the welds on top blow apart under boost. Ran 18psi and completely tore both welds apart. The problem I believe is the top is flat. They should have rounded the top. It balloons under boost then sucks in under vacuum. Stressing welds then breaking them. Stay far away from this intske!
    Date published: 2022-12-03
    Rated 1 out of 5 by from Horrible Fit I have a Cathedral Port LS and ordered the intake for Cathedral Port. I put it on and it hit the valley cover and the top of the heads. It has a big gap between the runners and the head. I called speedmaster and they said "Take a grinder to it and see if you can make it work". Not a big deal but I'm not cutting a brand new intake for it still not to work. Just not impressed with it at all, I never got to put my injectors in it but the fuel rail inlet for the injectors looks like it is off set about 3/4" from the base of the intake so it looks like the injectors would sit at a strange angle. Im sending it back and getting a jegs brand.
    Date published: 2020-12-01
    • y_2024, m_4, d_27, h_6
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    Does this fit cathedral port heads? & how much boost pressure will it handle or recommend for?

    Asked by: Hawk1308
    The Speedmaster 746-1-148-050 intake fit square port heads only.
    Answered by: jshook
    Date published: 2023-06-17
    • y_2024, m_4, d_26, h_5CST
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