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Author Topic: Holley 5200 metric threaded jets  (Read 2975 times)

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Offline fastfred

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Holley 5200 metric threaded jets
« on: July 27, 2009, 07:53:46 PM »
Does anyone know where I can get hold of the early metric threaded main jets for the Holley 5200 carbs?

My motor, a 2.3 needs a larger secondary main jet.

thanks   Fred

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Offline 72pair

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Re: Holley 5200 metric threaded jets
« Reply #1 on: July 27, 2009, 08:50:14 PM »
Use the old Esslinger trick of putting the stock secondary jet in the primary side, then drill the primary jet 2 # sizes larger than the original secondary size. I ran my 2000cc this way for years with much better performance. You'll just have to get an index of numbered bits. JT 
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Offline Srt

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Offline fastfred

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Re: Holley 5200 metric threaded jets
« Reply #3 on: July 29, 2009, 08:53:23 AM »
Got over the problem.

As the main jets are metric then the the two jets are numbered 142 and a 132. This means for instance that a 142 is in fact 1.42 millimeters in diameter. I bought a set of numbered drills from Harbor Freight, printed out a coupon from their web site and got all 60 drills for only $9.99.

I sized up the drills in the jets and carefully drilled just one out using the next size up drill.  I put the undrilled jet back in the primary side, the 142, and drilled the 132 with a drill that measured 1.47 millimeters and put it in the secondary.

The car always ran well low down but nesded more gas when the revs got up.

Seems a bit better.


Offline dick1172762

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Re: Holley 5200 metric threaded jets
« Reply #4 on: August 11, 2009, 12:10:20 AM »
Tap out the carb body and use Holley jets.
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