Phil99vette

iTrader: (11)

If your running a 230+ duration XER cam, please post your valve spring choice.
Phillip

W8N2SQZ

iTrader: (6)

I don't know if this counts, but mine is a 229 duration cam with .578 lift. I run the isky 295D and they have about 7000 miles on them without any problems. My rev limiter is at 6800 right now so I might not spin them as high as others.

VINCE

iTrader: (1)

I have 232/236 and I am running 918's. As of now I am not having any issues, but I have considered going with duals for my next setup..

Jorday

I have a 228/236 XER cam in my car and I use the isky dual springs. 6000 miles and climbing with no problems. I would just use 918s if I did it again. They seem to work fine for just about any cam.

Jordan

jrp

iTrader: (16)

i have REV duals with my TR230

Phil99vette

iTrader: (11)

If you can post seat pressures that would be great also.....open and closed
Phillip

2001 Pewter WS6

iTrader: (43)

I replied to your other post. From what I am told, you need Comp Dual 977 springs for anything over 232+ duration. I think the spring pressure was 400# open and I am guessing 170# closed.

FDLS6

iTrader: (4)

I've got comp 987's in my ls6 heads from absolute that I'll be using with big cam (236+). I know that they've been used successfully with the g5x2 (232/240). I think the problem with going to 978's or 977's is that you could run the risk of lifter pump at higher rpm... that's a lot of spring for a hydraulic roller. I guess I'll find out soon enough if the 987's can take it.
Bryan

2001 Pewter WS6

iTrader: (43)

What lift is that cam at??? You got some BIG ones trusting 918's with that setup... I hope that isn't an XE-R cam in there...

2001 Pewter WS6

iTrader: (43)

FDLS6 - Did you get the heads yet? Installed? I would double check with Jay. In testing, I am told the 987's went into valve float with a cam with a 232+ duration. I have a XE-R 236/240 with the 987's and my top end is flat. Jay thinks i and going into valve float. You are right, with the stiffer springs, you will need Comp R lifters...

FDLS6

iTrader: (4)

I've got comp r's... Jay felt that anything stronger than 987's might cause lifter pump even with the comp-r's that I have. I'm still putting the motor together, so nothing's set in stone. If I get nervous, I might go 978, which is in the middle I believe.

2001 Pewter WS6

iTrader: (43)

I have the Crane Lifters and I don't think that they are enough... Even with the 987's

Jorday

Hmm...after reading this maybe I wouldn't use 918s with my cam after all.

W8N2SQZ

iTrader: (6)

I can't remember but I think my 295D's were around 134-136 at the seat and I forget what open was.

MyLS1Hauls

iTrader: (2)

I like 918s and the only problem with them is that they are a single spring and everyone knows what happens when they break. Even though the spring pressures arent real high, they are a lighter setup and therefore can sacrifice some pressure and still be effective. The Crane duals seem decent, but there arent too many people using these. As for the REVs...I've seen too many reports of broken ones, but I havent seen any blue stripe 918s that have broken. I'm also not sure why people say its duration that necessitates a higher spring pressure. Its ramp rate and lift. Doesnt matter how long you hold the valve open...its how fast and how far you are opening and closing it.

mike#9

iTrader: (3)

Comp 977 or 978's. I am getting a set of stage 2 heads and a 230/236 cam from Absolute Speed and Jay insisted that he use 977's. He said that he has seen some valve float recently with G5X-2 and similar cams. They are a lot stronger than 987's.

Phil99vette

iTrader: (11)

I have had 2 different tuners setup 987s and both times they have had valve float/bounce with CC 987s. I am very fustrated because I think my floating valves are now bent again with only a couple of hundred miles.....
Phillip