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The Cars => 1967 Shelby GT350/500 => Topic started by: Mike James on September 29, 2018, 07:14:53 PM

Title: 67 428 2-4 Holleys - Jet Size Primaries?
Post by: Mike James on September 29, 2018, 07:14:53 PM
Having a problem with my car running too lean.  What jet size should I use in the primaries?
Title: Re: 67 428 2-4 Holleys - Jet Size Primaries?
Post by: 67_1183 on September 29, 2018, 07:46:12 PM
Primary is listed as 66.
Title: Re: 67 428 2-4 Holleys - Jet Size Primaries?
Post by: Mike James on September 29, 2018, 08:20:57 PM
Thank you.  I'd that what most people are running
Title: Re: 67 428 2-4 Holleys - Jet Size Primaries?
Post by: Mike James on September 29, 2018, 11:54:17 PM
I meant is that what you are running? Others chime on what jets you are using.
Title: Re: 67 428 2-4 Holleys - Jet Size Primaries?
Post by: JWH on September 30, 2018, 07:50:55 PM
Here is a link to the Ford Technical Service Bulletin (TSB) published in 1964 concerning the Holley carbs. If you are at sea level, start with #66 jets. I have read for every 2,000 feet of elevation, reduce the jets two sizes, so if you are in Denver for instance, start with 62s.
      Before you take the time to change jets, make certain the floats are set correctly.

http://www.427galaxieregistry.com/1964tsb.html

Jeff
Title: Re: 67 428 2-4 Holleys - Jet Size Primaries?
Post by: shelbydoug on October 07, 2018, 05:47:01 PM
Stock jets. They're fine.
Title: Re: 67 428 2-4 Holleys - Jet Size Primaries?
Post by: 1967 eight barrel on October 09, 2018, 06:13:44 AM
If you made cam changes stock jets aren't going to get it done. You'll likely have to change the secondary plates and power valves with decreased vacuum signal and the rear plates for fuel demand in the upper RPM range, as it will likely lean out.

                                                                                            -Keith
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