273 intake suggestions

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  1. 67Redfish

    67Redfish Active Member

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    Hello guys,

    I am looking for advice about an intake for my 273. It was originally a 2bbl but now runs an Edelbrock Performer carb on a stock intake from a 69 340. I am running an XE262H cam and Summit Racing ignition. If I could come up with a 273 Commando intake and maybe a 4 hole carb spacer what good/bad changes should I expect? Is it even worthwhile to change intakes? Basically, I am just looking for a little more get up and go. Thanks.
     
  2. dart4forte

    dart4forte FABO Gold Member FABO Gold Member

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    If you can find one an Edelbrock D4B. They are out there but expect to pay around $125
     
  3. cavemanmoron

    cavemanmoron Well-Known Member

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    318 or 340 or 360./ No replacment for more displacment. ;)
     
  4. bobscuda67

    bobscuda67 Well-Known Member

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    The stock 273 4 barrel intakes are heavy and they don't flow very well. Stick with what you have.
    A compression increase would help with better heads, but more cubes is the way to go. I went through this with my 273.
     
  5. rumblefish360

    rumblefish360 so close yet so far away

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    It may not even be worth the change in intakes. You will gain some good torque by a move to the Performer intake or the earlier one mentioned above.
    A 4 hole spacer would be the best spacer to use. Double check hood clearance. The gain will be small.
     
  6. 67Redfish

    67Redfish Active Member

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    It looks like the Edelbrock LD4B has smaller runners compared to the 340 intake I am using now. As I understand it, the reduced volume would increase velocity and thus torque, is that correct? Any idea how much gain I would be looking at? Thanks.
     
  7. IfItsGotWheels

    IfItsGotWheels X S Tech

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    Not only smaller runners, but smaller ports. The ports on 340 heads & manifolds are way bigger. Check the intake manifold port size in comparison to the head port size & you'll see what I mean. The LD4B manifold is a small port version of the LD340 manifold & was designed for the 273.
     
  8. rumblefish360

    rumblefish360 so close yet so far away

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    Yes, it does.

    Yes, that is correct, you'll probably look at 20 lbs. as a ruff general guesstimate.
     
  9. rumblefish360

    rumblefish360 so close yet so far away

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    Top picture is a LD340, modded as per the MP book.
    The bottom is a LD4B.

    100_0467.JPG

    100_0468.JPG
     
  10. 67Redfish

    67Redfish Active Member

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    Thanks for the help everyone. I received some very enlightening information in this thread and some PMs.
     
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