Quik

iTrader: (7)

would 918s hold the amount of power i want to make? this will be a 408 around 9.1 cr with cleaned up 317s and probably a LS2 intake. im looking to make around 9xx rwhp on pump gas. cam isnt decided yet, nor is rpm range.

would 918s be good for boost or should i go with a dual spring that has better seat pressure?

phildo

iTrader: (7)

Don't waste your time with the 918's. They will not support even moderate boost. Get some good duals. Patriot has some good springs.

Superman09

iTrader: (65)

dual spring. 918s will only really be good for a car boosting the stock motor so to speak, low boost. Im running them but im on the stock motor and 5.5 psi, working great but with a 408 and big power, def a dual spring.

gametech

iTrader: (1)

My 918's have worked fine on a STOCK displacement 5.7 with STOCK size valves and a STOCK cam at 10#'s of boost up to 6800rpm. Several others have had issues if the boost is increased or if you replace the word STOCK in any of those other areas. My guess is more valvespring pressure will be required.

Quik

iTrader: (7)

alright thanks guys, so ill just list them for sale then

JAvenger007

iTrader: (9)

patriot gold duals extreme i believe is their heavier duty set. Check into those for your 408

Pro Stock John

iTrader: (34)

Use whatever Speed Inc. reccomends on that motor. And 918's won't work on that combo, I would not even run 918's na with a stroker.

koji777

iTrader: (3)

Patriot Golds'

SonofaBish

iTrader: (5)

wow - looking for some big power... i have the patriot duals...

good luck george!

Quik

iTrader: (7)

yea, guess i have to keep up with the jones's ya know

C4 Silver Guy

iTrader: (2)

Dammit. I got 918's in my car. Guess I'll be going the dual route myself.