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setting valve spring heights

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GPGoverMPG
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Joined: Sun Apr 02, 2017 11:59 am
Location: South central texas

setting valve spring heights

Post #1 by GPGoverMPG » Sun Oct 06, 2019 8:24 am

I finally got time to work on my own stuff. I blended the cut lines from the bowl hog after the larger valves were installed and started measuring spring heights so I could find the right shims. So it's been a long time since I measured spring heights and I'm using a new Jegs micrometer. Do all the mics count down after your desired height? Example 1.700, 1.795, 1.790, until you get to 1.800? They cut my inside spring locator was to 0.618 so the shim hole needs to fit that. Below is a list of measurements and the shims measurements I think I need.

1 E-1.780 = .020
I-1.753 = .047
2 E-1.787 = .013
I-1.767 = .033
3 E-1.780 = .020
I-1.755 = .045
4 E-1.795 = .005
I-1.751 = .049
5 E-1.771 = .029
I-1.750 = .050
6 E-1.770 = .030
I-1.734 = .066

These seem to have the pattern on a sawed off shot gun. I guess I need to find a shim assortment so I can stack shims to the values I need. The last thing I need is the 7/16ths screw in studs from ARP I guess, just haven't got the right part number yet. Thanks for any help or ideas.
71 F350 4x4 Super Duty 7.3 IDI
72 F250 4x4 4speed 300 I6
72 F100 2x 428 Tri Power
2014 SHO

pmuller9
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Location: Columbus, Indiana

Re: setting valve spring heights

Post #2 by pmuller9 » Sun Oct 06, 2019 1:22 pm

The springs need to be shimmed to 1.700".
If possible try to get the installed spring heights within .010" of each other.
Shim kits come with .015", .030", .060" shim thicknesses

If the spring pocket in the head is wide enough for 1.500" OD shims use Comp 4757 shim kit.
If not the Comp 4754 shim kit has 1.437" OD shims.

You need a stud with a 1.750" installed height.
ARP 135-7101
The one problem with the ARP studs is that they have a tapered shank under the hex to locate pushrod guide plates.
If you are not using pushrod guide plates the holes in the head will need to be countersunk or add a washer or both.

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68Flareside240
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Re: setting valve spring heights

Post #3 by 68Flareside240 » Sun Oct 06, 2019 11:19 pm

Check the micrometer with your dial caliper to ensure it's reading correctly. Lots of complaints about those mics reading off for people due to the calibrated distance being inside the cup and not to the rim of the cup. If your retainer rides on the rim of the cup will need to know how deep the cup is and calculate as necessary.

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GPGoverMPG
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Joined: Sun Apr 02, 2017 11:59 am
Location: South central texas

Re: setting valve spring heights

Post #4 by GPGoverMPG » Mon Oct 07, 2019 7:23 am

Thanks for the help. I'll measure the spring pockets then order some shims and the studs. I did check the micrometer with a dial caliper and it read right on the money. Trying not to rush through things as I get closer to being done.
71 F350 4x4 Super Duty 7.3 IDI
72 F250 4x4 4speed 300 I6
72 F100 2x 428 Tri Power
2014 SHO

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GPGoverMPG
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Posts: 245
Joined: Sun Apr 02, 2017 11:59 am
Location: South central texas

Re: setting valve spring heights

Post #5 by GPGoverMPG » Tue Oct 08, 2019 8:04 am

Why don't they have .010 valve spring shims? Anyway, is it better to be at 1.690 or 1.710? Every spring needs at least one shim putting me at the 1.690 number.
71 F350 4x4 Super Duty 7.3 IDI
72 F250 4x4 4speed 300 I6
72 F100 2x 428 Tri Power
2014 SHO

pmuller9
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Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: setting valve spring heightshgt

Post #6 by pmuller9 » Tue Oct 08, 2019 9:52 am

Go tight between 1.690” and 1.700"
The extra few lbs of pressure will give you margin as the springs lose spring rate over time.

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GPGoverMPG
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Joined: Sun Apr 02, 2017 11:59 am
Location: South central texas

Re: setting valve spring heights

Post #7 by GPGoverMPG » Wed Oct 09, 2019 7:13 am

A little tight is way easier than going back to the machine shop to have one spring pad touched. I'm using the outer springs for cam break-in and I think I'll be able to set the head on with no gasket to find out if the push rods touch the head with the 3001-7 roller rockers. Then I can put the head on and measure for the correct push rods. Is there a problem with using just the number one piston with no rings to dial in the cam. Last thing for now, does anyone have a part number for the pipe nipple that holds the oil filter? I have two other engines but don't want to break them down if I don't have to. Thanks again
71 F350 4x4 Super Duty 7.3 IDI
72 F250 4x4 4speed 300 I6
72 F100 2x 428 Tri Power
2014 SHO

pmuller9
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Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: setting valve spring heights

Post #8 by pmuller9 » Wed Oct 09, 2019 10:21 am

Use .040" shims under the head to check the pushrod length.
They can be .040" thick strips of sheet metal.
I'm sure you meant 3002-7 rockers instead of 3001-7

Yes you can check piston TDC without piston rings.

The late model EFI block oil filter insert with the drain back feature number is E4TZ-6890-A.
It should work on the earlier blocks.

When you shim the springs, if you need two shims put the thicker shim on top.

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GPGoverMPG
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Posts: 245
Joined: Sun Apr 02, 2017 11:59 am
Location: South central texas

Re: setting valve spring heights

Post #9 by GPGoverMPG » Thu Oct 10, 2019 7:21 am

Yes on the roller rockers number. I can shim the head and combine checking push rod clearance and length, way easier. As always thanks
71 F350 4x4 Super Duty 7.3 IDI
72 F250 4x4 4speed 300 I6
72 F100 2x 428 Tri Power
2014 SHO

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