1959 - 1962, Mighty Mite, M422, Wanted, USED PARTS FOR SALE, and Knowledge Base
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- G-Private First Class
- Posts: 7
- Joined: Sat Jun 03, 2017 9:34 pm
What are you trying to do? A 60 is a nominal holley main jet size so you can go to a holley web site and try and go either direction. A larger # is richer and a smaller # is leaner. At least that is how it was when I was building an old door slammer back in the day!!! If you live in an area that is above 3000 ft you may want to go a size or 2 leaner.
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