zman1969

iTrader: (91)

OK I have a TR 224/224 on a 112 whick I believe is like .581 lift in my LS6. I found a deal on some Livernois heads- 243s stage 2 it says springs are good to .690 lift! looked at their website and here are the specs:Max. Valve Spring Lift: .680
Spring Pressure Closed: 150lbs
Spring Pressure Open: 382@.620 / 410@.680 my questions are as I know it IS too much spring for the mild cam. 1. I am concerned about too much pressure causing premature wear on cam/lifters?
2.what about losses in H/P -power output? - I hope these are a waste of brain time on my part - but does make me wonder. lastly is these heads use OEM valves- 3. Is there any worrry with that much pressure that it could pull a two piece valve apart? I know stainless valves are 1 pc but are OEM? I had an old 429 SCJ Torino that did it and believe me it wasnt pretty

Grimes

iTrader: (3)

You will be fine running springs like those. A lot of people run similar ones with no trouble.

zman1969

iTrader: (91)

seems like alot a spring for a mild cam but later if i go big i'll be already
no loss of h/p with that?

KMS.1320

iTrader: (1)

spring rate doesn't have much effect on HP.. think about it.

when one valve is opening.. another is __________ . This __________ the forces against each other.

zman1969

iTrader: (91)

your missing the point, it takes more torque to rotate a engine with heavier springs(why do you think oe's springs are so weak?) this extra spring pressure creates more friction - so there is no free ride here. the reason all OEMs have gone to roller is to reduce the friction- which frees up horsepower and increases MPG

vetteman9368

thats true of a static engine, not a dynamic one. however ring tension is just the opposite, it compounds itself. Adding spring pressure normally results in an increase in power and performance, even when no visible signs of valve float are there. There is lots of dyno and spintron data to back this up. Obviously too much won't help, but you'd be surprised how much an increase in spring pressure will help valve train stability. Of course this doesn't apply if your extra valve spring pressure is playing the pushrods like Jimi Hendrix on a guitar. Valvetrains are dynamic systems, and all parts must work together

67camaro

iTrader: (28)

The XER Lobes on your cam are pretty aggressive. I wouldnt think twice about using those springs.