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Old 11-03-2008, 09:05 PM
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Very suprised...

327 w/ stock vortec heads and springs... runs to 6,000 with no valve float (L79 cam). Just had to comment for no reason I guess.

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Old 11-03-2008, 09:07 PM
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Hey, it was a nice day here too.
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Old 11-04-2008, 09:23 AM
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Nice...

I just really, really thought that the weak nose pressure of the stock GM roller springs would just not be able to keep up as the RPM's increased... but whaddya know, they did.
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Old 11-04-2008, 09:53 AM
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Picturing tops of pistons retaining valves.....
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Old 11-04-2008, 09:03 PM
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All those old production SBC high-performance cams, hydraulic or solid, since ~1968 were used with the same valve springs that came with Grampa's 2-bbl 307 econo-motor. The stock Vortec springs have very similar specs.

That's not to say a spring upgrade's a bad idea, but sometimes factory parts work together better than one might imagine.
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