Does anyone have a spec for the rates of stock valve springs?

[Kern Dog]

I have a 1976 360 that has been running fine for years but is RPM limited.
It is a standard bore mill with #308 heads that were rebuilt. The heads have maybe 1000 miles on them in 20+ years so they should not be worn out. I installed them with the original valve springs from the truck engine that the heads were on.
It has a Weiand mid rise 4 barrel intake with a Mopar Performance 280/474 camshaft that runs quite strong out of the hole but runs out of breath early. I suspect the valve springs are weak, allowing valve float.
I saw a guy post this chart....

The very first on the list, #...0933 shows 115 lbs closed, 310 open. That is the spring listed for the 474 lift this cam has.
I have a set of springs I pulled off a set of Edelbrock BB heads, 1.55 OD. They were great but I needed to change them due to a switch to a roller cam. I'm curious if I can repurpose these springs into this 360 to eliminate the valve float.
The engine is on a stand and needs some attention before I install it in another car.

 

[mopowers]

From what I'm seeing, the valve spring specs for a stock '76 360 are around 85lbs on the seat and around 180lbs open. Here are the specs for the Melling stock replace valve springs for a '76 360. The valve springs used with rotators on the exhuast side would be different.

I think big block Edelbrock springs may be too tall for those heads. You may want to check installed height/coil bind since the SB heads likely have a shorter installed height - even moreso on the exhaust side if there are/were rotators. It's been a long time, but if I recall, the exhaust valves made for rotators have the grooves cut lower (or they might be shorter all together)? I could be wrong though - just something to check.

 

[toolmanmike]

Comp 901's are always a performance spring as a stock replacement.

 

[George Jets]

Something to research for replacement springs.


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[BSB67]

I have a 1976 360 that has been running fine for years but is RPM limited.
It is a standard bore mill with #308 heads that were rebuilt. The heads have maybe 1000 miles on them in 20+ years so they should not be worn out. I installed them with the original valve springs from the truck engine that the heads were on.
It has a Weiand mid rise 4 barrel intake with a Mopar Performance 280/474 camshaft that runs quite strong out of the hole but runs out of breath early. I suspect the valve springs are weak, allowing valve float.
I saw a guy post this chart....

View attachment 1716514121

The very first on the list, #...0933 shows 115 lbs closed, 310 open. That is the spring listed for the 474 lift this cam has.
I have a set of springs I pulled off a set of Edelbrock BB heads, 1.55 OD. They were great but I needed to change them due to a switch to a roller cam. I'm curious if I can repurpose these springs into this 360 to eliminate the valve float.
The engine is on a stand and needs some attention before I install it in another car.

Not a good chart or spring recommendation unless you have long valves and can achieve the suggested installed heights.

 

[Killer6]

I have a 1976 360 that has been running fine for years but is RPM limited.
It is a standard bore mill with #308 heads that were rebuilt. The heads have maybe 1000 miles on them in 20+ years so they should not be worn out. I installed them with the original valve springs from the truck engine that the heads were on.
It has a Weiand mid rise 4 barrel intake with a Mopar Performance 280/474 camshaft that runs quite strong out of the hole but runs out of breath early. I suspect the valve springs are weak, allowing valve float.
I saw a guy post this chart....

View attachment 1716514121

The very first on the list, #...0933 shows 115 lbs closed, 310 open. That is the spring listed for the 474 lift this cam has.
I have a set of springs I pulled off a set of Edelbrock BB heads, 1.55 OD. They were great but I needed to change them due to a switch to a roller cam. I'm curious if I can repurpose these springs into this 360 to eliminate the valve float.
The engine is on a stand and needs some attention before I install it in another car.

Wrong spring list, those are B/RB springs,....

 

[George Jets]

From post # 4 >

Ebay Item number
136736963541

$75.00 with free ship

☆☆☆☆☆

 

[TT5.9mag]

I have a clicker pen with a stronger spring in it.

 

[RustyRatRod]

Just get the correct springs for that cam.

 

[PRH]

Comp 901-16 in at 1.650-1.670.

Generally won’t work with ex rotators.

 

[Kern Dog]

From post # 4 >

View attachment 1716514392

Ebay Item number
136736963541

$75.00 with free ship

View attachment 1716514393


☆☆☆☆☆

Comp 901-16 in at 1.650-1.670.

Generally won’t work with ex rotators.

Thanks, guys. I was hoping that I could RE-purpose the springs from my BB Edelbrock heads but I don't mind buying new.
As always, I like being able to use what I have sitting on a shelf here but am not against cracking open the wallet when it makes sense.
$89 for a set of springs is cheap!

 

[PRH]

The Howard’s 98214 spring has an ID of about .800”………
Which is going to be tuff to fit over the 1.00” diameter locating step that’s on a typical LA head.

 

[66fs]

Check your installed spring hight. Truck exhaust valves usually had rotators and short valve springs. I always replaced the exhaust valves with standard or HP 340/360 valves. Then you can run 340 valve springs or the equivalent.