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holley 390

  1. Drivetrain & Performance
    Hey guys So yesterday I swapped out the stock intake and single barrel on my 72 250 for a offy intake and Holley 390 carb The first time I started it, it was idling at 3000 rpms so I started adjusting and now it’s the mixture screws at 1 turn from snug (any closer to snug and it won’t stay...
  2. Drivetrain & Performance
    Hey guys So I have a first gen with a 250 out of a 72 and today I’m starting the process of replacing the stock intake a carb with a offenhauser 4barrel intake and a holley 390. I’m leaving the stock exhaust manifold for now but will soon be getting headers. And I plan on driving the car a good...
  3. Drivetrain & Performance
    hey guys so I am considering putting a new offy intake on my 250 but I am debating between either dual single barrel's or I know a lot of people do a Holley 390. I am wondering what the pros and cons are for performance, mpg, reliability and anything else you can think of. my uncle who has been...
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