I would like to know why this intake has the fomoco stamp/logo but not the C7zx number on it the runner is blank. So where all GT500īs without that number but with a fomoco logo on the intake or whats the deal? And the oil filter adapter should be also right for GT500 yes? That one came from one as the most of the other parts.
I believe as stated by Randy previously, the later F.E. 8V aluminum intake (not a 427 L.R. which at least one version did not present a number in the casting but does have the FoMoCo, but perhaps in the oval vs the rectangular version) bare without the C7ZX number is generally attributed to the 427 M.R. as installed in the Fairlanes & Comets (O.E.M. on Cobras ever?). And yes, it would appear that the C7ZX version, is a modified version of the 427 M.R. intake (either the no number or the C7AE version), and was cast with the intent of insuring compatibility for gasket sealing on the taller inlet port versions of the F.E., as the exterior cast perimeter in the vertical dimension, although not an exact sum, averages approximately .100" - .150" greater.
Generally in my observations, the as cast port configurations of the intake and cylinder head at the familiar flanges are not so exacting as cast or so different dimensionally between the two engines (M.R. vs. taller port F.E.'s) as to restrict interchangeability from one to another for sealing (with reasonable gasket selection), but does present poor alignment in both the vertical and horizontal planes of the inlet port to point of discouraging the practice, if one is concerned with proper transition. But, since the castings do present significant variance in accuracy, and one is truly mixing unintended products, and injecting the variable of the sealing gasket selected, then yes, one could experience sealing issues; so one would be advised to look twice at the relationship before declaring a happy marriage.
Also, I made a reference as to use of the oil filter adapter previously.
Scott.