617-4020: AN6 Holley Single Feed 600-660 Series, Holley Dual feed 4010-4011 Series and all two barrel series with 9/16"-24 thread.
(GIF)
Summary: Great product
Yes, I recommend this product.
Summary: It worked great for the carb to 6AN fitting on fuel line connections. Had no problems fit like it should with ease.
Summary: It looks good, it fits and it should do the job intended, and I betting it won't leak.
Yes, I recommend this product.