Some people say:

"go to a truck shop and have them re-arch the springs"

Kanter sells new springs, I think Max Merrit might also.

Probably they both get them from Eaton Detroit Spring.

I don't know what it "should be". Maybe someone else can help. I bought some helper springs until I feel like a fresh infusion of cash is warranted, and set it up so the rear was just ever so slightly higher. Your mileage may vary:

Spring Discussion

If they're not spinning, it could be that they have been expanded because the valves were stuck at one time, e.g.

Lifter stuck, barrel expanded

I would like this, but only for basically doing this once, hopefully in May. Then I'd let it go to another for whatever the costs are.

Packard Don - note that Ross said it works for 327, 356, and 359 lifters, and since the 288 and the 327 were essentially the same, I guess if a 288 had hydraulic lifters it would work for those too.

In my car, i found the connection to the washer motor didn't fully close/leaked. I capped that off with one of those little rubber caps, and I got a lot better vacuum overall.

You don't have to. There might be a little bit of residual oil up there, but it's not a big deal.

Where?

How many miles, condition? Interior?

What engine and transmission? OD?

Might get more inquiries

As said, the keepers are very small metal half-hollow cones. One of those magnets on the end of a telescoping rod is very useful. To put them back on, put a dab of grease on them, they will then stick to the valve stem.

Here is a link with some discussion

pulling the valves discussion

I have both, but I was really only able to make use of the big C-shaped one when the engine was out of the car, it's pretty tight in there when you want to get to the valves at the back of the engine.

Here's one:

Flathead Valve Spring Compressor, Turning knob type

They're pretty strong and the space is a bit cramped. You will want the ones with the know you can turn.

Just putting this on the radar for those folks who may be able to attend:

56th Annual National Packard Meeting, June 25-30th, 2023, Rohnert Park, CA