sled_dog
1 ton status
What is the max lift the factory TBI valve springs will take? I want to build a new motor for my 89 Burb.
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.
What lift?
- Thread starter sled_dog
- Start date
big83chevy4x4
3/4 ton status
i think it around .450".
me personally i would put new springs in. i like the z28 springs. lift up to .490 lift and a nice pressure, their cheap too, like $25-$35 /forums/images/graemlins/peace.gif
me personally i would put new springs in. i like the z28 springs. lift up to .490 lift and a nice pressure, their cheap too, like $25-$35 /forums/images/graemlins/peace.gif
mendonca
Newbie
450 is definitely the max without some machine work on the heads, or the bottom of the spring retainers for a little more clearance.
I had a 440 lift cam in my '89 Blazer /forums/images/graemlins/k5.gif for a while. It ran fine, but it was close enough to trash the slip-over valve seals on all of the intake valves after about 2,000 miles. I have since rebuilt the engine to a 383 and remedied that problem.
I would also suggest getting a cam recommendation from the cam company of your choice.
I had a 440 lift cam in my '89 Blazer /forums/images/graemlins/k5.gif for a while. It ran fine, but it was close enough to trash the slip-over valve seals on all of the intake valves after about 2,000 miles. I have since rebuilt the engine to a 383 and remedied that problem.
I would also suggest getting a cam recommendation from the cam company of your choice.
