Engine Stock Air Box Stroked 351/383

Discussion in '1994 - 1995 Specific Tech' started by 95Vert383AOD, Nov 26, 2013.


  1. 95Vert383AOD

    95Vert383AOD Active Member

    Joined:
    Jun 10, 2008
    Messages:
    1,300
    Likes Received:
    35
    Trophy Points:
    49
    Location:
    Providence, RI
    My engine is a 351 stroked to a 383 90mm Throttle body 90mm MAF

    Right now i have a 90mm intake going to a 4" long K&N filter. I know it picks up alot of heat and unnecessary dirt from the engine compartment.

    The stock box has an outlet that is quite large and can be modified to fit. If i opened it up inside do you guys think it would work well?

    I don't like the idea of my filter in the fender and most CAI arent 90mm/4". I also dont like the idea of an exposed 1ft filter.

    Has anyone tried it?

    Chris
    #1
  2. revhead347

    revhead347 I have face herpes.

    Joined:
    Jun 14, 2004
    Messages:
    6,590
    Likes Received:
    282
    Trophy Points:
    124
    Location:
    Acworth, GA
    I did it a long time ago. I did managed to get a Pro-M 77mm in there with just a little cutting. I'm not sure if that helps you or not.

    Kurt
    #2
  3. 95Vert383AOD

    95Vert383AOD Active Member

    Joined:
    Jun 10, 2008
    Messages:
    1,300
    Likes Received:
    35
    Trophy Points:
    49
    Location:
    Providence, RI
    Did you lose power??? I wish someone out there flow tested a modified or stock airbox to at least get an idea of CFM. They make aftermarket air boxes but for the price i would build my own. But i'm trying to go for the stock look and maintenance.
    #3
  4. revhead347

    revhead347 I have face herpes.

    Joined:
    Jun 14, 2004
    Messages:
    6,590
    Likes Received:
    282
    Trophy Points:
    124
    Location:
    Acworth, GA
    I never dynoed it, but I could not tell the difference.

    Kurt
    #4
  5. 95Vert383AOD

    95Vert383AOD Active Member

    Joined:
    Jun 10, 2008
    Messages:
    1,300
    Likes Received:
    35
    Trophy Points:
    49
    Location:
    Providence, RI
    ok i figured out the 90mm will fit in if i do a bunch of cutting. I also did some measurements and found that the "RU-2590" K&N should fit in place of the stock filter but still allow plenty of air flow around the filter and also has a 4" inlet. I think i can keep 4" diameter flow throughout the whole thing. The rubber inlet on the box is going to get cut back on an angle about 2" to open it up there too.

    I'm sure when people see my stock assembly they will instantly notify me that i need to upgrade it.

    Ford invests alot of time and money designing these boxes....why not use them if you can right???
    #5
  6. revhead347

    revhead347 I have face herpes.

    Joined:
    Jun 14, 2004
    Messages:
    6,590
    Likes Received:
    282
    Trophy Points:
    124
    Location:
    Acworth, GA
    I don't think there will be any restriction in the filter. Most if the restriction comes from the factory rubber elbow. I doubt it's enough to make any difference.

    Kurt
    #6
  7. 95Vert383AOD

    95Vert383AOD Active Member

    Joined:
    Jun 10, 2008
    Messages:
    1,300
    Likes Received:
    35
    Trophy Points:
    49
    Location:
    Providence, RI
    the outlet of the stock filter is definately smaller.
    #7
  8. revhead347

    revhead347 I have face herpes.

    Joined:
    Jun 14, 2004
    Messages:
    6,590
    Likes Received:
    282
    Trophy Points:
    124
    Location:
    Acworth, GA
    You have to cut that outlet all out to fit the bigger maf in there anyway.

    Kurt
    #8
  9. 95Vert383AOD

    95Vert383AOD Active Member

    Joined:
    Jun 10, 2008
    Messages:
    1,300
    Likes Received:
    35
    Trophy Points:
    49
    Location:
    Providence, RI
    I was looking at using the Stock replacement K&N. The "E-0940" It has a gasket around the edge and an inner metal plate. Can that metal base plate be removed? I want to avoid modifying the plate on the filter because i would hate getting shrapnel inside the element.

    Chris
    #9
  10. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

    Joined:
    Nov 30, 1999
    Messages:
    8,312
    Showcase:
    9
    Albums:
    1
    Likes Received:
    1,192
    Trophy Points:
    174
    Location:
    a van down by the river
    meh, afm powerpipe and be done with it
    #10
  11. revhead347

    revhead347 I have face herpes.

    Joined:
    Jun 14, 2004
    Messages:
    6,590
    Likes Received:
    282
    Trophy Points:
    124
    Location:
    Acworth, GA
    I remember doing it with the factory replacement K&N filter without any issues. All I had to do was cut out the outlet side a little where the MAF was too wide and too long. The outlet on the MAF stuck into the rubber pipe a little. It worked fine.

    Kurt
    #11

Share This Page