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*Billla* · 05-26-2007, 08:41 PM

If you're looking at the GMPP new head P/N 12558060 the max lift is .475; the spring is the 10212811 spring, 80#@1.7 installed height.

Agree with Jamis that it's not about the lifter type, and that you should compare the spring specs to those recommended by your cam manufacturer and see how they map.

05-26-2007, 08:41 PM	#3
Billla Account Suspended Join Date: Sep 2005 Location: Monroe, WA Posts: 3,815	Re: stock vortec valve springs? If you're looking at the GMPP new head P/N 12558060 the max lift is .475; the spring is the 10212811 spring, 80#@1.7 installed height. Agree with Jamis that it's not about the lifter type, and that you should compare the spring specs to those recommended by your cam manufacturer and see how they map.