STAGE III The STAGE III (3) manifold was a true "sleeper" in that it was over 2" LOWER than the original Weiand tunnel ram, while still possessing all necessary runner lengths and plenum volume for balancing the carburetors and their reversion waves. What is important to keep in mind with today's "fabricated" manifolds, is that this was developed by Jim in 1978!	STAGE II This is the more conventional, but still highly modified inside runners manifold used on Jim's B/MP Mustang. The original Weiand Plenum had been sectioned, to reduce its size. Look closely and you can see the flat casting in the middle of the runner groups, which on the PRO model (below) served as the floor to the new plenum.

Most people today know Jim Miller only from the "MID-LIFT" patent and development of the precision geometry rocker arm, but Jim's original first love was always cylinder head and intake manifold development, all stemming first from the BOSS 429, but graduating to all the popular engines as word got out that a small shop in the middle of the Midwest was breaking new ground. The manifold shown here could easily have been fabricated by Jim, but was purposely left looking as close to "stock" as possible. This was because there was another school of thought on intake manifolds that supported "IR" or Individual Runner, which Jim did not subscribe to. His intentions was to fool the occasional onlookers studying his engines with believing that he used an IR manifold, when in fact his hidden plenum was anything but an IR.

 

This shot shows the first welded plate between the two four-groups. Not seen, is that the huge "V" on the underside of each of these four group runner towers has been welded to allow machining out what is still shown here to form the V (at right).	After the side plates are welded in place between the runner groups, a mill is used to machine out the V until the bottom is even with the floor plate between them, then the arduous task of opening  and hand blending the ports is begun. Not shown is that the backside of runners is welded to provide material for enlargening.

This shot shows the welded plates between the two four-groups of runners, to seal the "V" bottom once a top cover is mounted. Straight shot of the runners, as well as their massive size is easily appreciated.	After the plenum was finished, a 1/4" aluminum plate with Moroso Dominator spacer blocks was fitted. The original dominator mounting pattern was kept on the manifold to allow easy disassembly for cleaning.

 

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