Im looking to replace the valve springs in my Indy 440-SR heads.
They still has the original springs installed that came with them from Indy.

Can anyone suggest the spring set I should replace them with.

How long have you been running the springs
that are in there

What does the cam manufacture recommend for pressures and go from there.

What type of lifters and lift?

How long have you been running the springs
that are in there.

What does the cam manufacture recommend for pressures and go from there

What type of lifters and lift.

They have been in for around 8 years.
Cam Card says, Spring Press 145 seat 350 open.
Solid lifter .632 intake & .640 exhaust.

ON INDY PDF
2” spring height, spring seats 1.550”

You might look into the K-motion K-800 springs for that lift and cam. I ran them on a small block with a .650 solid roller with good luck. I ran them on drag week which had hours of 3000-3800RPM highway time on them. I did change them every year before drag week but I never had a problem, just did it for insurance.

Pull two of the old springs(I would check two of the center cylinder springs (from #3,4,5 or 6 do the center heat cross over) if you want to see if they are gone or still usable
PAC has a bunch of really good valve springs, maybe they are the major supplier to a lot of the after market companies like Indy, Bullett, Comp and other cam companies

All I use now days(last 6 years I think)
have been the Pac springs... nicest springs
out there for the price... as Cab said pull
a couple and check them