If you currently have cylinders installed on your case, look at the base of each cylinder and locate the flange at the base of the cylinder (the case/mount studs pass through holes in the flange). A narrow deck cylinder will have a plate located on top of the flange, ostensibly to spread out the mounting pressure over a great area, and reduce fatigue at the flange surface. Also, narrow deck jugs typically use a female flared nut as opposed to the std style hex nuts (9/16 and 3/4 I think) found on WCF cylinders.
Most of the E series 320's I've built are W.C.F, or wide cylinder flange cylinders.
In the event you don't pick up the jug listed here I've got a number of fresh cylinder assemblies at STD bore in chrome, some oversize in steel and others in any number of configurations. I also include a gasket set and SL or ECI pistons with each cylinder assembly if needed.
