Valve Springs and Cam - racer questions

[RBCharger]

I am assembling my 440 and have run into a few things on the valvesprings/cam. So 2x questions - which springs and which locks?

I have the Trick Flow 270 heads - the 801-C01. The valvesprings on the head are as follows:
1.460" O.D. dual spring with damper (TFS-16893)
120 lbs. @ 1.900" installed height
394 lbs. @ 1.175" open
390 lbs. per inch rate
.650 max lift

I have Comp cams 21-228-4, Specs are:
.545/.545 and 241 int./247 exh.

I have the Hughes 1.6 rockers, so cam lift will be .581 with the rocker ratio.

Comp calls for a 924 spring which is
1.509" OD dual spring
112 lbs. @ 1.900" installed height
355 lbs. @ 1.200" open
347 lbs rate

Will the cam live with the higher pressures on the trick flow springs? Comp say it's within tolerance.

Frankly the comp spring 925 is nearly identical to the PAC spring on the Trick Flow heads.

Comp also calls for a 10 deg lock, the TFS heads have a 7 deg lock. Do I need to make the upgrade? I am not seeing a reason, but that's why I'm asking.

Any help would be appreciated. I think the old break in with just the dampener and outer spring may be the ticket as well.

Thank you in advance!

 

[beanhead]

Just an FYI you should test the TF springs before using them....they were notorious for being stronger than the paper specs.
This was my experience:

Seat pressure (TF advertised spec) 138 @ 1.950"
(Tested spec) 170 @ 1.940"

@.600" lift (TF advertised) 390 lbs
(Tested) 430 lbs

Coil bind checked @ 1.175"

 

[RBCharger]

Just an FYI you should test the TF springs before using them....they were notorious for being stronger than the paper specs.
This was my experience:

Seat pressure (TF advertised spec) 138 @ 1.950"
(Tested spec) 170 @ 1.940"

@.600" lift (TF advertised) 390 lbs
(Tested) 430 lbs

Coil bind checked @ 1.175"

Will do. Thank you. They show a PAC spring, but still worth checking.

 

[beanhead]

Yes TF uses PAC for their springs. Good quality stuff.

 

[Geoff 2]

Going to a higher ratio rocker ideally requires more seat tension & more spring rate...because you are accelerating the valve train faster & more 'spring' is needed to control it.

112 seat tension is too low.

 

[Rick62]

Valve spring pressure in excess of what you actually need is a waste of horsepower.