2000NavyZ

iTrader: (8)

last year while coming home from the store, i rev matched to down shift and a rocker snapped. with the setup i have in my sig, should i upgrade my stock rockers?

supersick99z

iTrader: (66)

Trunion upgrade is the best for the money

JUSTINSWS6

Or some comp steel roller rockers

Darkman

iTrader: (2)

What is the open pressure of your valve spring set up?

01ssreda4

iTrader: (96)

Pics? Stockers?

2000NavyZ

iTrader: (8)

they're just stock rockers. how do i check to see what the open pressure is on the valve springs?

SOMbitch

iTrader: (8)

First case of a stocker breaking I have heard...puking bearings yes but snapping......daaaaaaamn...

Darkman

iTrader: (2)

Pull one or more of the springs and buy, rent, or borrow a spring pressure tester. Some auto parts stores have them and any machine shop will have one. You should also check for coil bind on one more of the assembled valve springs.

http://www.cranecams.com/uploads/instructions/13e.pdf

Since stock rockers are pretty stout the odds are that you simply got one that had a structural flaw in the metal.

I would upgrade the trunions and stick with stock rockers unless you have some exotic valve springs/pressures.

2000NavyZ

iTrader: (8)

the springs are prc 675 rated from tsp.

Darkman

iTrader: (2)

If I looked at the correct version those are rated at 471 pounds of open spring pressure.

2000NavyZ

iTrader: (8)

so what does that tell me?

LSxPwrDZ

iTrader: (4)

400 is the most open pressure you want to run on stock rockers. Much more and valve tip damage will occur as well as rocker failure. You need a good roller rocker with that kind of pressure.

joecar

The unwritten rule is that you post pics of part you broke...

we're curious to see how the stock rocker snapped.

Darkman

iTrader: (2)

I thought the maximum open spring pressure for stock rockers was something higher than 400 pounds based on some folks returning to stock rockers after breaking Yella Terras while running open spring pressures higher than 400 pounds.

Jesel Sportman shaft rockers are rated to 900 pounds.

sepsis

iTrader: (7)

Just stay away from yella terra. People on here have had bad luck with them breaking.

01ssreda4

iTrader: (96)

Scorpions too. Those things are garbage.

2000NavyZ

iTrader: (8)

i think the rocker is actually sitting on the floor in my car, when i get it out of storage ill take some pics. and if i had to take pics everytime i broke something and post about it, id be a damn post *****!

Darkman

iTrader: (2)

Look at post #14 and post #15 here:

https://ls1tech.com/forums/generatio...-arms-run.html

NOS327

iTrader: (30)

Thats funny, between three of us running scorpions on fairly radical solid roller sbc for 4 years now, not a single failure. Im talking 290 seat and close to 700 open, 7200 and 8000 rpm applications. Maybe theres a design flaw in their LS version???? Any personal data on this or are you quoting hearsay about scorpions?

Darkman

iTrader: (2)

1.7 vs. 1.5 ?