Looks like it started with a cast alum. intake that a fabricator added a blower mounting pad to be used with a set back roots blower. Manifold weights twenty nine pounds as seen in the pictures and has had a twenty four bolt burst panel provision added to it.
Manifold is set up for 1/8" port nozzles and ports measure 2.125" x 1.375". From deck surface to blower mounting surface the manifold is 7.00" tall and from center of second stud hole to edge of sealing surface in the front it is 7.50". That measurement allows the buyer to measure from the center of there second hole to the end of there blower snout to see if they will have enough snout for the blower set back and if there blower will seal up.
Plenum opening in blower manifold is 6.750" x 4.250" and blower mounting plate is made from .375" alum. which has been gusseted up nice on the sides but will need to be lapped flat once mounted on the motor.
Manifold has been drilled and tapped 1/8" pipe two spots to put a boost gauge and the racer can run water thru the front of the intake if they choose.
Welds are fair on the intake but not a show piece by any means so if you are looking for an entry level blower manifold for your eighteen degree SBC project this is just what the doctor ordered.
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.