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Double valve spring?

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So I'm taking apart my 289 cylinder heads to get a good clean on them sense I have them off. I'm taking the valve spring off and there is a smaller spring in a larger one. I was wondering if this was factory style or if someone did it befor I had the car? Also if it would be beneficial to buy new springs and go to a single one? The current spring are perfect other than being a impossible to get off.

If anyone has suggestions on taking them off a little easier I would appreciate it! My current tool is just not cutting it and don't want to have to buy another one.
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So I'm taking apart my 289 cylinder heads to get a good clean on them sense I have them off. I'm taking the valve spring off and there is a smaller spring in a larger one. I was wondering if this was factory style or if someone did it befor I had the car? Also if it would be beneficial to buy new springs and go to a single one? The current spring are perfect other than being a impossible to get off.

If anyone has suggestions on taking them off a little easier I would appreciate it! My current tool is just not cutting it and don't want to have to buy another one.
From what I’ve read, that is a damper spring used on HP289 Boss 302 and early 351W
 

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Most likely a replacement spring set for a long-ago cylinder head refresh. Only hipo heads had inner dampers in the factory sense.
The dual springs are HD in that they beneficially change the spring harmonics AND provide increased valve spring pressure.

I used to use the standard KD compressing lever and an air line connection to put air inside the cylinder. Don't know what tool you have.

791383


If the cylinder heads are off KD tool makes a different one to do the job.....
 
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1966 mustang coupe, 289 V8
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Discussion Starter · #4 ·
Most likely a replacement spring set for a long-ago cylinder head refresh. Only hipo heads had inner dampers in the factory sense.
The dual springs are HD in that they beneficially change the spring harmonics AND provide increased valve spring pressure.

I used to use the standard KD compressing lever and an air line connection to put air inside the cylinder. Don't know what tool you have.

View attachment 791383

If the cylinder heads are off KD tool makes a different one to do the job.....
So you don't think it would be worth it to change the springs? And my cool some cheap clamp like things from China. I can flex the metal by hand. I'm just going to buy a good tool so I don't have to worry about it.
 

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65 Fastback 289/T5
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Sorry to say this level of engine building is out of my league or ability to provide you any help, but I did notice you have very similar painted M/Ts to my polished units and I love the look of the old school hold downs on em, don't think id seen on a sbf before so wasn't sure how well they'd jive. Would you happen to remember where you got them?
 

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So you don't think it would be worth it to change the springs? And my cool some cheap clamp like things from China. I can flex the metal by hand. I'm just going to buy a good tool so I don't have to worry about it.
Yeah, I wouldn't necessarily read that into what I wrote......
Don't know your game plan, so I don't know what to tell you. Personally, once I remove valve springs (unless one broke), I generally
replace all of them, do the valves, do the stem seals, etc. etc. If the heads are off the engine it's as good a time as any.
I'd probably match port them to the exhaust too......
 

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Yeah, I wouldn't necessarily read that into what I wrote......
Don't know your game plan, so I don't know what to tell you. Personally, once I remove valve springs (unless one broke), I generally
replace all of them, do the valves, do the stem seals, etc. etc. If the heads are off the engine it's as good a time as any.
I'd probably match port them to the exhaust too......
But, but , aluminum heads....lol j/k!!

Chris
 
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