aonghus - redline is difficult to determine unless you know what all the parts are, what the cam is, compression, etc etc - IMHO There's two issues - 1. where your motor stops pulling or making power, 2. ...and redline is where it's getting close to coming apart.... most sbc's will live to 6000rpm - but it's usually an over rev that breaks a piston skirt, and weak springs that allow for a dropped valve, and or stocl parts flying apart to end up in cabooom! Real world stocker 5500-5700rpm is conservative. But yes - valve springs are critical..
Rat Touring 1969 Camaro X44 496 Richmond Super T10 Plus 4-Speed 3.55 4 wheel disc
..and sporting all new suspension, wheels, etc etc... take a look...
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