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I did the research and decided to change the (yellow) valve springs on my 2002 c5z since it falls into the high risk category. I bought a new set of GM blue springs #12625033 and to be on the safe side checked all of them for tension. Every spring checked is 80 lb. @ 1.80 in. which is below the factory spec (90 lb.) for replacement. Has anybody else run into this problem and what did you do? Now I'm thinking I should just pull the trigger and buy the pac1218 springs. The car is a DD and sometimes I run it pretty hard so I don't want any problems down the road. I have found that GM is sourcing some of their replacement parts from China and I buy a lot of OE parts for all makes from the dealers for my business. What say you? Thanks, Gary.
Im curious on this as well, replaced mine when i first bought the car. The new springs were blue and if i remember correctly the mechanic told me the replacements were not as stiff as the old yellow ones.
I'm bummed you broke a blue spring but thanks for reporting. You are the first I've heard of. I will be curious to see what the future holds for the blue springs.
30K miles on the motor or since you put in the blue springs?
Any motor damage?
What's the X? Never seen that...
Track the car?
Yes I know, too many questions.
[QUOTE=grantv;1591383220]30K miles on the motor or since you put in the blue springs?
Any motor damage?
What's the X? Never seen that...
Track the car?
Yes I know, too many questions. [
The 1218 "x" is a added heat treatment to strengthen the springs even more than the 1218. Stock motor and cam. Just get the 1218 unless you want to spend the extra money. Get the PAC's though dont bother with blue oem or any other spring.
After a short search I found a set of pac1218 springs for $107 shipped (the GM springs were $56). These came in at 120 lbs. @ 1.8" which is still under spec (130 lbs.) according to what I found online. At least these are above the GM spec (90 lbs.) which is a reasonable margin of safety. I am using a Rimac valve spring checker and it has been the standard for many years. My advice to anyone changing springs is to have them checked just to be safe.
I did the research and decided to change the (yellow) valve springs on my 2002 c5z since it falls into the high risk category. I bought a new set of GM blue springs #12625033 and to be on the safe side checked all of them for tension. Every spring checked is 80 lb. @ 1.80 in. which is below the factory spec (90 lb.) for replacement. Has anybody else run into this problem and what did you do? Now I'm thinking I should just pull the trigger and buy the pac1218 springs. The car is a DD and sometimes I run it pretty hard so I don't want any problems down the road. I have found that GM is sourcing some of their replacement parts from China and I buy a lot of OE parts for all makes from the dealers for my business. What say you? Thanks, Gary.
Maybe it's me but when both sets of springs come in 10lbs light..... Sounds like you need to check the height gauge on the Rimac and or calibrate it.
As for the spring to drop in there.... PAC-1218X, my daily job is valvetrain design and that's the piece to use if you aren't a cheapskate.
I have the blue springs in my 02. I replaced the yellow's as soon as I bought the car about a year and a half ago. With about 5k miles on it since then, it runs just fine. Maybe i'll swap to the PACs for the peace of mind tho..
May want to do some digging on his springs and failures.
I would be interested in that digging? As our springs have the absolute lowest failure rate of any springs at the same price point.
We had one or two unscrupulous people selling PEP or Chinese spring kits as ours, however they were put on notice once we found out who they were. The PEP/Chinese springs, retainers and boxes aren't even close to ours, so they're easy to spot.
Valve springs ???!!!
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