Stop in for a cup of coffee

Mattax said
Holley main jet numbers do not represent diameter. They represent flow rate. Changing the jets 2 sizes up or down will make a noticible change in AFR. I'd have to look up that list number but 66 PMJs are relatively small to begin with. Take it up cruising around 65 mph in top and you'll know if its too lean or not. Don't do this on a crowded road or some place you can't slow down and pull over.

Thank you Mattax

Yes, I'm working off of the Holley spec sheets and called their tech service line and explained my setup and driving style. They recommended their 58 (122-58 which is 0.057)

Primary main jet is a 122-64 according to the documentation. I'll know more when I break it down. I like to gather all the parts before taking things apart so I've not gotten into the carb yet.

I'm not much of a wrench turner but I do a lot of research :thumbsup:

Always, always, always appreciate the feedback and guidance from you guys. Please keep it coming