Choosing Valve Springs
Choosing Valve Springs Its going to be time to replace valve springs in my 2000 Z28 soon. I bought it with 918's in it and after reading alot of threads I'm scared of them.
Cam is a comp xer lobes .581/.592 lift 224/230 dur 114lsa
Question is do you guys think the patriot extreme dual spring kit is too much? i think its 410# open pressure
Thanks for any advice. I had planned to go with pac springs but there doesn't seem to be a clear cut winner wherever I look. Worst part of it all is I'm on a college student's budget (not much).
Thanks again
Cam is a comp xer lobes .581/.592 lift 224/230 dur 114lsa
Question is do you guys think the patriot extreme dual spring kit is too much? i think its 410# open pressure
Thanks for any advice. I had planned to go with pac springs but there doesn't seem to be a clear cut winner wherever I look. Worst part of it all is I'm on a college student's budget (not much).
Thanks again
With that lift, those springs will actually only have about 384lbs open (.592" lift), not the full advertised 410lbs@.660" lift from 1.800".
I would recommend the PRC dual spring kit over the Patriots however. The PRC spring kits have better track records from a machining accuracy stand-point. We've seen and heard of quite a few Patriots that did not install at the 1.800" they intended them to, due to poor machining on the retainers.
I would recommend the PRC dual spring kit over the Patriots however. The PRC spring kits have better track records from a machining accuracy stand-point. We've seen and heard of quite a few Patriots that did not install at the 1.800" they intended them to, due to poor machining on the retainers.
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
ok. do you think its doable to get out under $350 with pushrods. Im afraid im going to get gobbled up with the "well while youre in there you might as well...."
Thanks again Matt
Thanks again Matt
I've got the PRC .650" spring kit with pushrods for $379.99.
http://www.texas-speed.com/shop/item...d=172&catid=54
http://www.texas-speed.com/shop/item...d=172&catid=54
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
ok great ill be in touch when the time comes. Ive personally installed that kit on a friends trans am so that actually does make me feel a little better. Thanks again
PSI MAXlife Component springs are probably the most advanced beehive on the market.. they are rated up to .650 lift and they will handle those XE-R lobes no problem.. lighter weight than duals as well
Thanks ill look into those. No failures so far? my car is a daily driver that sees zero abuse during the week and the occaisional show off with the guys on the weekend so im not aweful on springs, i just want something i can trust. I kind of feel like a dual is overkill but the added peace of mind is whats got me leaning that way
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Verdad Gallardo you re-use the stock retainers and locks.. new seals and locators needed most likely though.. I'm going with these on my new 243 heads.. I've heard nothing but good things from PSI.. and the company that I am using for my CNC'ing suggested these.. they are the pros not me so that's what I went with 
I have used the PRC duals for 150,000 miles now with no problems. A very good spring. They have been redesigned since the last set I bought so now they are even better than before. I like the peace of mind that the dual springs provide. Car is a DD heads/cam all the boltons making 452/418.
PS The Springs kit that Matt from Texas Speed told you about will have everything that you need push rods, seals, seats, titanium retainers, locks, and so forth. If you are going to do it do it right. Why would you want to use the stock (heavy) retainers on a upgraded valve train??
PS The Springs kit that Matt from Texas Speed told you about will have everything that you need push rods, seals, seats, titanium retainers, locks, and so forth. If you are going to do it do it right. Why would you want to use the stock (heavy) retainers on a upgraded valve train??
Last edited by slt200mph; Nov 11, 2010 at 02:39 PM.
yes.......so sad i know I've never turned the car past 5500. Don't hang me for it I know it has to be done. Bought it that way and I've been saving to get the valvetrain upgraded. the previous owner didn't put anything extra into it.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Fair enough, although I dont "look" for failure threads, I haven't ever seen a PAC failure and I have read quite a few threads 
Truth is, everything will have some failures. Every brand, every spring. I think the patriots would be fine as well as the PAC, PRC and also look into Lunatis. Thats what I chose, the Lunati Golds. There wasn't much info on them, but after doing some research and seeing that these springs are subbed out by a big name/reputable spring maker I figure what the hell. They are $220 shipped from Atlantic Speed.
Truth is, everything will have some failures. Every brand, every spring. I think the patriots would be fine as well as the PAC, PRC and also look into Lunatis. Thats what I chose, the Lunati Golds. There wasn't much info on them, but after doing some research and seeing that these springs are subbed out by a big name/reputable spring maker I figure what the hell. They are $220 shipped from Atlantic Speed. awesome thanks. Yeah when i say ive seen failures I mean that while aimlessly reading every post on here and tuning my chemistry professor out I've seen a couple 918 failures and one pac failure. Are the lunati's dual springs? Ive also seen someone reccomend manley's. Looks like now I just need to man up pick one and see what happens.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Well so far so good, they installed at the right heights, they look like a great bang for the buck. So far, this is all I have run them. And btw, I'm running them on very aggressive Cam motion lobes.
http://www.youtube.com/watch?v=IaX82jcFAuI
http://www.youtube.com/watch?v=IaX82jcFAuI