what size are the collectors and primaries on edelbrock headers 6872.. i looked and i couldnt find it!! thanks

 

depends on how old they are. if they are the older version, they come with 1 5/8" + 1 1/2" all in one unit, you cant buy them in different sizes, i mean that parts of the header are 1 5/8" and other parts its 1 1/2" . if they are the newer version, they are 1 5/8" and the collectors are 2 1/2"

 

And those are donut type collectors.