rookie question bout engine rpm

[wireflight]

Probably your best bet is going to be to contact Ford SVO's "Tech Line" at 1-586-468-1356. Having said that, I offer the following:

I can't find my old SVO catalogs, so I can't confirm that Ford offered a 413 version of the 351W through SVO; however, it does sound vaguely familiar. Although I seem to recall such an engine being offered through non-SVO sources, but I can't find anything on them worth mentioning -- except, perhaps, their existence.

The current SVO "stroked 351W" crate engine features a Crane hydraulic roller cam -- but ... unless I simply didn't know where to look ... neither the information available at fordracingparts.com nor the information available at cranecams.com indicates which of the Crane cams Ford uses in that engine.

Although it might be an off-the-shelf bumpstick, Ford may have specified different lobe centers to be used with an "off the shelf" lobe (a common way of getting a "custom" cam grind). On the other hand, Ford's claimed lifts (.566/.576) don't directly correspond to anything in the Crane Cams online catalog. Perhaps more significantly, it's bigger than the M-6250-Z303 camshaft that SVO touts as ""CamZilla" the biggest and baddest camshaft that Ford Racing offers."

The Crane Cams "PowerMax" HR232/352-2S1-12 features the same duration at .050 (232/240), with lift of (.563/.584). Advertised duration of said PowerMax cam is 294/302; all this is on a 112-degree LC.

Crane doesn't specify a redline -- and even if they did, it would probably be based on the use of Crane valvetrain components. The 392 uses Ford/SVO's -X303 heads and valvetrain. The -X303 camshaft features (.542/.542) lift and (224/224) degreed duration at 0.050 valve lift, with (286/286) degrees "advertised" duration for "power to 6200 rpm."

Regrettably, "GT40" has become such a marketing slogan for Ford that it is as meaningless as the term "big block" (see my rant elsewhere).