I am in over my head and I am trying to sell some big block parts on ebay. I thought I had researched enough where I would be covered but I had a guy ask me this..........
Q: how visually do you tell the difference between lb and rb block manifolds as they list different ones for both with one are you selling thanks

HUH? What does he mean by lb and rb? The # which I thought was a part # is 3s14014.

I suck
Thanks for your help in advance.

Dodge big blocks come in two families, B (383, 400, ect) and RB(413W, 440, ect). The RB's have an increased deck height and stroke, and therefore wider intake manifolds.

Are you selling intake or exhaust manifolds? The exhaust manifolds should be completely interchangeable.

The aprox meas between the two points on the front or rear of the intakes is, 7 3/4" for a low block, 383, 400, and 8 3/4" for a raised block, 413, 440, 426 wedge. These measurments are taken at the front or rear of the machined surface that bolts to the head all the way out on the point.