I have LT4 springs now, but I want to run 1.6RR on my crate motor. What would be a good spring to upgrade to? I need something That can rev to 6,000 and support at least .550 lift. .560 would be nice. I am on a budget so if ya'll could post a price that would be great.

Thanks in advance. :hail:

 

Anyone . . . . Please:hail:

 

If you are running LT4 springs, then we can assume your heads still have the small stock diameter spring pockets for low-performance springs such as those. They are 1.25" outer diameter like stock springs.

No 1.25" diameter spring is good to much over .500" lift, no matter what the spring mfr says; if they claim otherwise, ask them if they will warranty your entire valve train if you use them at lifts like you are talking about. If they won't, then you have your answer.

The cam mfrs such as Comp or Lunati (who will warranty your entire valve train if you follow their recommendations) will tell you the same thing: you need bigger springs to get past the .500" barrier. The next size up is 1.45" outer diameter. You can get springs in that size that are good to the lift you want to run. The springs aren't expensive, less than $100, but you have to get your heads machined to accommodate them.

 

Thanks a lot.