Thread: 97-03 GTP stock valvespring lift rating?

Anyone know this? I believe stock lift is somewhere around .400" or slightly over that.

Curious what lift numbers the stock springs are rated too.

Thanks!

Originally Posted by Sven The Sexman

Just think stock...because you'll float valves anything higher than stock lift.

I guess I am more curious about coil binding at the moment.. I have a set of 1.9 ZZP modified rockers coming in soon, and am wondering whether or not to invest in springs. I am going to stay very close to stock shift points (right around 5500rpm is the plan). With so many people saying they have ran stock springs with these rockers, I was wondering if the stock springs were rated higher than the stock cam lift. I usually have not seen that being the case with the LS motors I used to work on.

I wouldn't chance it and would go ahead and change the springs especially since your stockers probably have some decent miles on them. Plus springs are rather cheap and easy to do so it's a no brainer.

haha.. I did not see said post so I am all ears thus far. I am wondering if I would go 90 lbs or 105 lbs...

changing the springs without doing the timing chain and/or tensioner also makes me nervous though!

L76

Originally Posted by REDCOMPG

L76

I'll have to check those out. What do they usually go for?? ($$)

Cheap!!!

Last time I checked they were a few bucks each.. Most commonly out of the g8


http://www.grandprixforums.net/threa...ngs-for-VS-Cam

Nice!

I will check ZZP and a few other places and try and find a set. Maybe some are for sale on this forum now.. Will have to look

You won't find the L76 on ZZP but you can grab them from the dealership or gmpartsdirect etc etc hell probably even rockauto too

I ran stock springs for a couple years and had no issues shifting at 5950


Sent from my iPhone using Tapatalk

Fwiw my tensioner had normal when I pulled it at 110k 15k or so had 1.9 rockers


Sent from my iPhone using Tapatalk

Just run 105lb springs and the proper retainers and whatnot. No need to touch the timing chain if your engine has been well maintained. I put 105lb springs on a 170k block with no issues for the 10k miles I had them on.

I believe the stock cam lift is .278, when combined with the 1.9 gives you .528 lift. Stock V springs or the L76 V springs allow .520, so you should be using the modified retainers to avoid bind. If you're going this route, also figure to replace your valve stem seals as well.

I used the L76 Spings with my rolling rockers as the sat pressure is pretty much the same as stock (90lbs) and therefore easy on valve train, tensioner,

anyone can correct me if wrong, thanks : )

Pretty sure 1.9 + stock cam is like .490 lift


Sent from my iPhone using Tapatalk

Originally Posted by wa04compg

Pretty sure 1.9 + stock cam is like .490 lift

lolz, corrected...

Stock L67/L32: 182/192 .258/.258 115 N/A

memory was off a bit, added .02, lol, sorry!