Shimming valve springs

[panhead_kicker]

I've found a lot of discussion about shimming valve springs to make up for sunken valves, but I find no part number to do this with. I know I've done this once before, but can't remember what I used. I need .0625 thickness to get my intake valve spring to 1.500.
Is there an HD # for these shims?

[Cotten]

P_K!

First you measure the distance between collars.
(an old wheel brake cylinder spring instead of a real one makes it easy.)

Then you measure the poundage of your spring at that length.
(Drill press and a bathroom scale routine...)
Or measure at what length it gets you up to spec (90?),
and calculate how many of what size of shims get you there.

They slip over the guide upon its shoulder.
Sometimes, this shoulder must be cut down!

Beware of large shovel shims upon a Pan, as they will not sit squarely unless the head has been molested.

.....Cotten

[RUBONE]

H-D did not supply shims, if they had seats out of spec they supplied oversize valves to bring them back in. The shims must come from the aftermarket. Any good automotive machine shop should have assortments that will work.
Robbie

[Cotten]

Yes Robbie!

Shims are aftermarket, although they have always been the standard of the auto industry.

SPRNGSHM.jpg

The MOCO didn't want to complicate things for their servicepersons, I guess.

....Cotten

[panhead_kicker]

Yes Robbie!

Shims are aftermarket, although they have always been the standard of the auto industry.

SPRNGSHM.jpg

The MOCO didn't want to complicate things for their servicepersons, I guess.

....Cotten

I've got the picture and I'll check with my local Indy shop, thanks guys.

[58flh]

PK---I have used shims from Autosupply Parts Stores as Robbie mentioned!---& with good results!,---The thing to watch-out for,-NEVER go to a .125 SHIM!.--It may have been done --But I wouldnt!,--Its time to venture other obstacles & NEW SPRINGS are def. in order!---Just my 2--GOOD-LUCK & stay---Safe!---RICHIE

[Cotten]

Just for clarity, Folks,

Any auto supply will have the equivalent of the large late shovel shims, as they fit many autos, as well as evos and whatever.

But the smaller OD is necessary for use with factory-design pre-'70 collars, and might only be found where such machines are serviced.

Extreme shimming, as Richie warns, encourages the collars to rock.
.060" is bold!
But they sell shims that big.
Better than two thirtys I guess.

....Cotten

[nmaineron]

I know the moco had valves made oversized but did they ever make shorter valves for the sunken seats?

[Cotten]

Ron!

Shortening the stem only helps the springpack geometry.
Enlarging the head does the same, and also helps the airflow and combustion chamber issues of a sunken seat.

....Cotten

[panhead_kicker]

Ron!

Shortening the stem only helps the springpack geometry.
Enlarging the head does the same, and also helps the airflow and combustion chamber issues of a sunken seat.

....Cotten

Given the seats are in otherwise good shape, the oversize valves are simply a drop in?

[Cotten]

P_K!

No, since the seating face is too deep, a new seating face is cut wider, and therefore shallower, to match the valve.

....Cotten