And some L76 info, quoted from RegalGS and other sites.
The L76/L92 valve spring. Part # 12589774. With a GM list price of $3.59 each. (Pace Perf, $2.59)They have the same 90# seat pressure as the yellow LS6 spring, but a lower spring rate. LS6 are 375#/in. L92 are 348#/in. The Comp Cams 105# springs have a spring rate of 313#/in.
These springs actually cost less than our stock springs.
The valve spring specs for the GM springs are on page 281 of the 2008 GM Performance Parts Catalog. The L92 spring does have a limit of .530 lift so it is for rockers and mild cams, like the VS. By my calculations, at .500" lift the L92 and the 105# Comp cams are within 3 or 4 lbs in total pressure. This is a lower cost set up that should lower the wear compared to the LS6.
From the GMPP catalog 12589774
Valve Springs
• Beehive style springs
• Standard L76/L92 springs
• 1.800" installed height @ 90# pressure
• 1.300" @ 264# pressure
• Max lift .530"
