Safe RPM Limit

PRHeads

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I haven’t had great experiences with fast rate hyd lifter cams and extended rpm operation in BB applications.
I suspect that some valvetrain unhappiness will occur in the 5500-6000rpm range.
 

blue_stocker

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I've used this particular Harold Brookshire camshaft design in LA and B-engines and as Lunati states 6200. No reason to spin to the moon regardless of the strength (or weakness) of the bottom end components. If the parts are good, within spec and assembled properly don't push your luck and rev past the camshaft design parameters. It's a good grind with excellent street manners and power band, so enjoy it!
 
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66Satellite47

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I agree with PR the valve train will be your limiting factor. If Lunati says 6200, I'd plan on 6000 to 6200. No idea what the Sidewinder heads support. Stay around 6000 and be happy.
 

Frank Mopar

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I would start at 5400 and go up or 6000 and go down until the hot rod is happy. IMHO
 

Runcharger

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My son ran that cam in this truck. Reringed 68 440, ported 452's and lots of time on the limiter. 5800RPM and no failures after several years of beatings.

Sean the tree hugger.jpg
 
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