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raceman14 · 12-10-2010, 01:24 PM

Mike,
Your question on valve springs, pretty much depends on the quality of the hydraulic roller lifter you are using and where it starts to lose ability to hold hydraulic pressure.

Most folks think once they are pumped up they stay that way but after many hours on the spin-tron, we learned they bleed pretty bad at high rpms. Most of the work was done for GM 604 Oval track crate engines but the theory applies to any hydraulic lifter.

I have some super nice PSI springs designed for the application along with matching roller hydraulics for .842 lifter bores & Chevy Tie bars. Set-up height is in the 1.850-2.050" / .600-.800" lift. This package is 125-150# on the seat depending on the set up height. This package is worth about 1000rpm and 15-20HP on a Stock 604. More cam and more head flow makes a greater difference.

It is a delicate balance kind like balancing a see-saw with the spring pressure on one end and the hydraulic lifter on the other. I can tell you that valvetrain stability is worth 10-20% RWHP increase on hydraulic lifter engine.

12-10-2010, 01:24 PM	#3
raceman14 Junior Member Join Date: Dec 2010 Posts: 3 Likes: 0 Liked 0 Times in 0 Posts	Re: Titanium Valve < Spring Pressures Mike, Your question on valve springs, pretty much depends on the quality of the hydraulic roller lifter you are using and where it starts to lose ability to hold hydraulic pressure. Most folks think once they are pumped up they stay that way but after many hours on the spin-tron, we learned they bleed pretty bad at high rpms. Most of the work was done for GM 604 Oval track crate engines but the theory applies to any hydraulic lifter. I have some super nice PSI springs designed for the application along with matching roller hydraulics for .842 lifter bores & Chevy Tie bars. Set-up height is in the 1.850-2.050" / .600-.800" lift. This package is 125-150# on the seat depending on the set up height. This package is worth about 1000rpm and 15-20HP on a Stock 604. More cam and more head flow makes a greater difference. It is a delicate balance kind like balancing a see-saw with the spring pressure on one end and the hydraulic lifter on the other. I can tell you that valvetrain stability is worth 10-20% RWHP increase on hydraulic lifter engine.