So I am currently working on rebuilding my 1995 Z28 and I have ordered a gm lt4 hot cam with .492 intake and exhaust lift . I was wondering if i will need new valve springs to accomadate for the lift? the part number from summit racing is NAL-24502586. thanks

 

Yes, you will need new springs.

 

what springs would you recommend?

 

Go for the LT4 springs. They're dirt cheap and will get the job done.

 

stay away from the Lt4 spring...its to weak to get the job done for long

 

I hate people who do this, but, you should have gotten the "Hot Cam Kit". Comes with the cam, springs, retainers, etc.

 

and then toss the springs out.. and drop another 150 on some good ones

 

i would get some pac 1218's
you can get them from a few of the supporting vendors on this site

 

Another vote for the Pacs

 

He's only running .492 lift, he'll be fine.

I have been running the same cam, same springs, same lift for 10,000 miles so far and the car sees 6000rpms everytime I drive it.

I have heard about concerns when using the LT4 springs with 1.6 rockers and running .525 lift, but even then I dont think its much of an issue. I have been on this board for a good 7 or so years and cant remember any first hand complaints off the top of my head. There have been a lot more posts warning of possible issues than there have been reporting issues.

 

which of the supporting vendor sites have the pac 1218 springs?

 

i know herron performance had a gp on them not to long ago, give him a call and see what he can do for you