onefastbunny

iTrader: (2)

i've heard alot of talk about stock valve springs hanging open under boost i was just wondering what springs ppl were running and at what boost levels. i have a 2000 t/a and am trying to work out the final bugs of an sts install i am currently only running 5psi and was also wondering how high people were running on stock internals

is 10-12psi out of the question with only upgraded valve springs?

AFASTYZFR1

iTrader: (55)

I would also upgrade pushrods while your in there

Patriot Gold Dual Valve Springs (16psi)

onefastbunny

iTrader: (2)

is the rest of your engine stock? just valve springs or pushrods too?
what pushrods are you running if other than stock?

AFASTYZFR1

iTrader: (55)

my engine is not stock anymore......but when it was I had comp 918 springs with comp pushrods...http://www.exoticperformanceplus.com....html?item=522


also ran 10psi with a tr224 cam (stock shortblock)

Pat-Man

iTrader: (3)

I think anytime you push the boost past 5 - 6 PSI you'd want to run some dual valve springs and hardened pushrods. With higher boost levels you'll start to experience valve float.

Hugger Z

iTrader: (4)

I am at 7psi. Stock engine. Upgraded to TSP hardened pushrods and LS6 valvesprings (higher seat pressure than the stock LS1 springs and very affordable since I was on a budget). If I were to boost higher a stronger spring would be needed though (and and engine rebuild ).

99ssleeper

iTrader: (98)

just do the math. intake valve area minus the stem area times the boost pressure. i would shim the springs to offset the extra pressure, making sure the coils still have adequate clearance.