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XE274 - will these springs work?

April 16 2017 at 8:16 AM
David  (Login dars55)
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I've selected the XE274 Comp cam for my 428 and I can't find information on which springs are compatible.

What I've been trying to find out is if the 940-16 Comp springs (already installed) will work with this cam. These were installed 3000mi ago when I had the engine built.

Can anyone tell me what I need to look at to determine if these springs will work. I have the spring specs from Comp but I don't know which numbers I should be looking at.

 
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Joel
(Login tall6970)
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Re: XE274 - will these springs work?

April 16 2017, 8:50 AM 

Per comps website, you need 924-16 springs, which are dual springs with 347 lbs\in. The 940-16's are single springs with 241 lbs\in spring rate. I'd say you need new springs. With that, all of the necessary checks and modifications would be required when switching springs.

 
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Ross
(Login Bad427stang)
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A little light, will likely float

April 16 2017, 11:47 AM 

If they are installed at a factory 1.81 height on iron heads, seat pressure will be 112 and open is at best 250. That's plenty for a stocker, but if you are spinning it high enough to make some power for that cam, it'll likely float.

If you are using Edel heads at 1.88 installed height, they are way too weak.

Come back with what you are running for heads and a planned installed height as well as adjustable or stock rockers, but likely those springs aren't usable
[linked image]
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- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 445 cid FE, headers, RPM intake, 1000 HP series Holley, 4 speed

 
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David
(Login dars55)
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I was afraid...

April 17 2017, 2:54 PM 

That I'd also need to replace the springs.

I have stock cast iron heads with stock rockers.

This started as replacing the stock intake, now we're at:

Performer RPM intake
XE274 cam
Comp lifters
Comp gears and chain set

And now it looks like I'm adding springs to the list too. This is a 4200lb street car with C6 and 3.70 rear that I've built to be bulletproof and I'm looking for a little more out of it - and more things for us to wrench on!

Thanks for your input.

 
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Ross
(Login Bad427stang)
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They aren't too expensive though

April 18 2017, 4:29 AM 

A set of bulk from Alex's Parts would work fine

https://www.alexsparts.com/fe-ford-valve-spring-kit-drop-in-fit-high-performance-7-degree-352-428/

or a set of Comp 972-16 if your retainers and keepers are new

https://www.summitracing.com/parts/cca-972-16/applications

Either would be good with your cam, shim to proper installed height and go.

[linked image]
---------------------------------
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 445 cid FE, headers, RPM intake, 1000 HP series Holley, 4 speed

 
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David
(Login dars55)
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Ross - thank you for this information

April 19 2017, 1:29 AM 

I contacted Alex's last night and they said I need to use their Max Output spring set because the duration on the XE274 cam is higher than 226 @.050". The maximum duration on their High Performance set is 226.

Their Max Output are here:

https://www.alexsparts.com/fe-ford-352-428-max-output-drop-in-valve-spring-kit-flat-tappet-engines/

Can you give me your opinion on this set - I'd appreciate it.

I'm not an expert in spring selection/replacement - but no time like the present to learn! I'm lucky to have a garage buddy who's a career master tech at the local Lincoln shop and he has every tool we've ever needed and has performed every repair we've ever done, so I have great support.

Thanks again.

 
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Ross
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Well

April 19 2017, 12:38 PM 

Their recommendation is odd for why they recommend the other spring, and I know it says it in clear print, been their forever, but the duration of a cam has very little to do with the required spring pressures, I ignore it

You could run either of those springs, closed pressure is the same. However, the MAX springs have more open pressure at just about 310-315 with your cam.

The ones I recommended will be closer to 280

Either set will work, their recommendation will be slightly more dangerous at break in, but could hold in a little higher RPM once broken in, but if you are running stock rockers you really don't need the extra pressure, they are pretty light.

If you are confident you can light it right away for break in, their recommendation is fine but if you go with the big ones, be sure you are comfortable with break in

[linked image]
---------------------------------
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 445 cid FE, headers, RPM intake, 1000 HP series Holley, 4 speed

 
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David
(Login dars55)
Members

Ross - went with your recommendation

April 22 2017, 5:06 AM 

After talking this through with my mechanic and doing some reading I went ahead with your recommendation and ordered the high performance drop in kit. I haven't pushed this engine hard (but I might now after these additions...) and with stock rockers I'm comfortable with that set.

Thanks again for your help.

https://goo.gl/photos/owE8WCe13HpUhH1j7


 
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Wes Adams Ford428CJ
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I run 145 on the seat and 345 Open~

April 18 2017, 8:16 PM 

But it's in a boat. If it was me.... I would shoot for 130-135 seat and about 300 or a little more open. Those ramps in the XE Cams are a little radical. I do run a XE274 in my 390 boat. I would also buy Crower cam savers lifters. JMHO
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