Chevy SB/BB valve springs.

Dan_Gyoba

Turbo Swapper
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#3
Well, while I know that the lift on SBC/BBC cams is (typically) greater, from what I recall, 5000 RPM was a big INCREASE in redline on those, so I'm not sure about the suitability of the springs for carst aht are intended to run at 6500+ RPM. I remember a lot of guys with the V8s having valve float issues at 5500 RPM with upgraded valves and rockers.

That's not to say that it couldn't be done. I knew a couple of guys who had 7500 RPM monsters, too.
 
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#4
Valve float is due to valvetrain weight vs spring used.

The BBC inners are stronger than our springs stock, so they are great!
 

bfr1992t

The quiet one
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#5
Don't forget about boost pressure assisting with float on the intake valves. ;-)

I've run the 975 springs for 5+ yrs now. 1.5mm over valves, 25+psi, 7200 rpm. I had my stock 92T springs tested at 65kmi and they were weak.