Valve Spring options
 

Looking at replacing my valve springs. (396/350 combo) conventional cam (non-square nose) solid Smith Lifters. Currently using COMP-999 conventional spring, Was told by Bullet to Use the PAC-1427's conical style. These are now "made in China" and I have heard some complaints about durability and longevity with them. Are they the only option
now? Are they that bad? Used to use Isky tool room but had an availability issue last time. Bullet said that the COMP's are too much and could be causing harmonic issues.
FYI also ordering a different cam when I make the change. Im looking for some input with real word results if possible.
thanks in advance

Re: Valve Spring options
 

Call Ken at Motorsports Unlimited. You can get the number off of their website.

Re: Valve Spring options
 

I have talked to people at PAC about springs being made in Michigan. Sources of wire can be from outside of the US, but I have not heard they source metal or wire from China or make them in China. Anything is possible, but to be fair to PAC Springs, saying they make them in China deserves some validation since it is seen as a negative. What is the source of the info?

Re: Valve Spring options
 

I agree, a call to Matt from PAC would be a good way to verify this info. Their website says they manufacture all their springs in Michigan USA.

Re: Valve Spring options
 

I have an NOS set of Comp 999-16 valve springs that have been on my shelf for a really long time. Would make you a really good deal on them if you wish to continue with the same spring? I used PAC 1225's for my cam.

Re: Valve Spring options
 

I know for a fact the years ago well before this China deal that several high end spring manufacturers were getting very high grade spring material from Sweden and it was a 6 month lead time and very expensive!

Re: Valve Spring options
 

As a follow up, I communicated with Matt and PAC. He said they do NOT have springs made in China or metal from China. The bad info has been spread by a few re-sellers on Amazon who either didn’t know or didn’t fill out the description properly.

Re: Valve Spring options
 

Jim, Thank You for putting common sense back into some of the posts
that are made. I know I appreciate you doing this this and not letting
things get too far off the rails. I know that sometimes facts ruin a
really good story, but I'll take the facts any day.

J.R.

Re: Valve Spring options
 

I’ve been running the pac conical springs on my zl1 stocker engine about 60 passes no problems

Re: Valve Spring options
 

I have the same cam as you , 400hp 427 , for years I used a Manley nextek spring that came with a damper and I took out the inner spring. Worked great, lasted forever, never broke one and my cam is more square nosed and my car is a stick. Still have a set in my spare motor. I believe that the only advantage of a conical spring is weight at the valve. Sorry, but I do not have the manley number, you could probably figure it out in their catalog