I'd say from 5000 to 5200 rpm with the stock valve springs. If you go over 5500 with the stock rocker arms and shafts, it will brake a shaft and bend a push rod eventually.
67 428 Mustang Fastback Super Pro Drag Car
92 F150 P/U Trk
2002 BMW 3.0i Z3 Roadster
90 Acura Integra
| 
