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  #1  
Old 01-18-2022, 10:47 AM
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Wagoneer Taylor Wagoneer Taylor is offline
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1978 401 Valve Springs Help

Hey guys,

For some reason I am having a heck of a time finding valve spring info.

More over, what is stock specs?

If anyone can point me in the right direction or let me know what you used?

I am building a completely stock 401 internally, but I would like to use dampened springs.

Thanks,
Taylor
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #2  
Old 01-19-2022, 09:16 AM
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Cliff Cliff is offline
350 Buick
 
Join Date: Mar 30, 2002
Location: Upper East Tennessee
Posts: 858
My 1981 Chilton's manual has valve spring specs for the 401 but only up to 1974. It's an "auto" manual so it doesn't include Jeeps, and 74 was the last year for the 401 in cars. But I can relay the 74 specs if you think it will be of any value.
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1977 Cherokee S

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  #3  
Old 01-19-2022, 05:09 PM
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Wagoneer Taylor Wagoneer Taylor is offline
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Quote:
Originally Posted by Cliff
My 1981 Chilton's manual has valve spring specs for the 401 but only up to 1974. It's an "auto" manual so it doesn't include Jeeps, and 74 was the last year for the 401 in cars. But I can relay the 74 specs if you think it will be of any value.

Thanks Cliff, I am sure it couldnt hurt to have the specs on 74.

Please share.
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #4  
Old 01-20-2022, 08:01 AM
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SC/397 SC/397 is offline
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You might be able to find it faster if you looked up valve springs for a 360.
The 360 and 401 use the same cylinder heads.
For a stock application, I usually buy these and eliminate the rotators.
https://www.ebay.com/itm/221346985073

I will see if I can find more info for you.
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  #5  
Old 01-20-2022, 09:06 AM
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Wagoneer Taylor Wagoneer Taylor is offline
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Join Date: Dec 17, 2018
Location: OR
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Quote:
Originally Posted by SC/397
You might be able to find it faster if you looked up valve springs for a 360.
The 360 and 401 use the same cylinder heads.
For a stock application, I usually buy these and eliminate the rotators.
https://www.ebay.com/itm/221346985073

I will see if I can find more info for you.

Hey SC/397, I should have reached out to you! You having built about a million on these.

Do you use or know of a set that has the damper in them but would be a nearly stock pressure?

I will look into 360 springs as you mentioned too
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #6  
Old 01-20-2022, 09:09 AM
Wagoneer Taylor's Avatar
Wagoneer Taylor Wagoneer Taylor is offline
258 I6
 
Join Date: Dec 17, 2018
Location: OR
Posts: 426
Quote:
Originally Posted by SC/397
You might be able to find it faster if you looked up valve springs for a 360.
The 360 and 401 use the same cylinder heads.
For a stock application, I usually buy these and eliminate the rotators.
https://www.ebay.com/itm/221346985073

I will see if I can find more info for you.

Another question, why do you eliminate the rotators?
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #7  
Old 01-20-2022, 03:54 PM
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SC/397 SC/397 is offline
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I guess the main reasons I eliminate the rotocaps is because the early engines didn't have them and because it is harder to find the shorter springs.
Also, there is less of a problem with coil bind if you are using a slightly higher lift cam.
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  #8  
Old 01-21-2022, 11:54 AM
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Wagoneer Taylor Wagoneer Taylor is offline
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Quote:
Originally Posted by SC/397
I guess the main reasons I eliminate the rotocaps is because the early engines didn't have them and because it is harder to find the shorter springs.
Also, there is less of a problem with coil bind if you are using a slightly higher lift cam.

So the springs you sent in the link are longer then stock?
The problem I am having is I dont even know what size I should have in the first place?
I am running a stock cam.
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #9  
Old 01-21-2022, 01:01 PM
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Cliff Cliff is offline
350 Buick
 
Join Date: Mar 30, 2002
Location: Upper East Tennessee
Posts: 858
I had mentioned that my Chilton's only included the 401 up to 1974, but I was wrong - it goes to 1976. Here are the specs:

outer spring test pressure 223 lbs @ 1.35"
spring installed height 1-13/16"

There is a separate spec for police engines:

outer spring test pressure
intake 270 lbs @ 1.38"
exhaust 270 lbs @ 1.19"

The test pressure specs for 1976 360 CID are 213 lbs instead of 223, same height
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1977 Cherokee S

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  #10  
Old 01-23-2022, 06:17 PM
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Those specs look about right. 1.800" installed height and around 100# on the seat. I think the lighter ones may have been around 80# on the seat.
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  #11  
Old 01-24-2022, 02:04 PM
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Wagoneer Taylor Wagoneer Taylor is offline
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Thanks guys, this is helping me narrow it down at least.
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #12  
Old 01-27-2022, 03:48 PM
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rang-a-stang rang-a-stang is offline
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  #13  
Old 01-28-2022, 09:37 AM
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Wagoneer Taylor Wagoneer Taylor is offline
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Join Date: Dec 17, 2018
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Quote:
Originally Posted by rang-a-stang

I dont know whether to laugh hysterically or

I am going with laugh!
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #14  
Old 01-30-2022, 11:15 AM
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SC/397 SC/397 is offline
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This is a really good How-to vid for you.
https://www.youtube.com/watch?v=oFX_Xq9WHTI
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  #15  
Old 02-17-2022, 02:19 PM
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Wagoneer Taylor Wagoneer Taylor is offline
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Join Date: Dec 17, 2018
Location: OR
Posts: 426
Quote:
Originally Posted by SC/397
This is a really good How-to vid for you.
https://www.youtube.com/watch?v=oFX_Xq9WHTI
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #16  
Old 02-17-2022, 02:22 PM
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Wagoneer Taylor Wagoneer Taylor is offline
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Join Date: Dec 17, 2018
Location: OR
Posts: 426
After talking with Comp Cams, they recommended PN 940-16

Max Lift:0.64
Installed Height:1.9
Coil Bind Height:1.2
O.D. of Outer:1.464
I.D. of Outer:1.07
Spring Style:Single
Spring Rate:241
Seat Pressure:93
Damper:Yes

This seems to match up with what you guys have listed above. Just need to check OD and ID specs.
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #17  
Old 02-17-2022, 03:27 PM
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rang-a-stang rang-a-stang is offline
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Those are the springs I am running on mine.
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79 Cherokee Chief (SOLD, goodbye old buddy)
(Cherokee Build Thread)
11 Nissan Pathfinder Silver Edition 4x4
09 Mazdaspeed3 Grand Touring
00 Baby Cherokee
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  #18  
Old 02-17-2022, 04:10 PM
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Wagoneer Taylor Wagoneer Taylor is offline
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Join Date: Dec 17, 2018
Location: OR
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Well Hey that makes me feel much better!

Did you buy retainers and locks as well?
744-16 and 603-16.
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Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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  #19  
Old 02-17-2022, 06:09 PM
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goldhammer goldhammer is offline
 
Join Date: Aug 08, 2004
Location: Willamette Valley, OR
Posts: 5,177
Don't forget a decent set of seals either
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ASE Master Collision Tech
"Beast" - 81 "S" W/T, 85-360, T-18, Lock-rite,wag alloys, 31-10.50 Pro Comp MT's, Warn 8274 in a fabbed bumper/deer strainer(tested and approved)

88 XJ, 3" lift, 31-10.50's, custom bumpers and winch/tow bar mounts, Warn 9500HS, custom sliders/steps, camo paint, & headliner

Member: FSJ Prissy Restoration Assoc.
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  #20  
Old 02-22-2022, 09:08 AM
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Wagoneer Taylor Wagoneer Taylor is offline
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Join Date: Dec 17, 2018
Location: OR
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Quote:
Originally Posted by goldhammer
Don't forget a decent set of seals either

Any recommendations for seals?
__________________
Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Pewter, Blue Interior, Original 401
PO swapped in a 360, soon to be a 401 again!
"Soon" is a relative term.
Cracked cylinder put a hurt on me + bad connecting rods.
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