Hoover Mods

The Type 1 based air cooled VW engine has a flawed oil system design that does not allow enough oil to the 1-2 side of the case. The Hoover mods fix this flaw.

To call a Type 1 based engine "air cooled" is only telling half of the story.  They are cooled by your engine oil as well, which is why they have an oil cooler.  With that in mind, getting as much oil to your heads as possible whill help to keep your heads cool and the temperature more constant.  The Hoover mods do this with several modications to the oil galleries, lifters, rocker arms and adjusters.  

We are big believers in the Hoover mods at Vintage Volks.  We do them on nearly ever engine we build.

Check out our video on YouTube to see how we do it!


  The customer is responsible for shipping the case both directions.
  Your packing materials must be reusable or we will charge a packing fee.
  Your case must be clean, no oil, dirt or grime or we will charge a cleaning fee.
  The studs must be removed or we will charge a $20 stud removal fee.
  This price does not include return shipping.  Actual shipping amount will be charged when your case is returned.

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Drill and Tap All Oil Galleries

There is simply no way to get your case clean without removing all the gallery plugs. You would be amazed at how much junk we find in some of the blind corners!

Clearance for Stroker Crank

Cranks larger than 74mm will require machine work on the case to make them fit. The larger the crank, the more work is required to make them fit.

Case Cleaning

We will clean your case in our Better Engineering heated parts washer to get all that grease and grit out.