Comp 981 vs Lunati 73943 valve springs - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-29-2010, 10:12 AM
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Comp 981 vs Lunati 73943 valve springs

Here are the specs
Comp 981
1.250 Single with Damper
Seat Load 105#@ 1.700"
Open Load 273#@ 1.250
Coil Bind 1.150
Rate 370

[B]Lunati 73943
1.250 Single with Damper
Seat Load 108# @1.750
Open Load 339# @ 1.250
Coil Bind 1.060
Spring Rate 462

My question is the cam I have recommends the Lunati springs because it is a Lunati cam. The heads I am looking at have the Comp 981 springs as the first option as well as 987 springs as an upgrade but it doesn't list nor do I know if the Lunati springs are available as an option. Are the springs listed above basically equal? The will be run with 1.5 rockers. Thanks for the help.

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Old 12-29-2010, 10:53 AM
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Lunati 60104

The cam is the Lunati Voodoo 60104 hydralic flat tappet cam.
Cam Specs are:
Advertised Duration (Int/Exh): 276/284
Duration @ .050 (Int/Exh): 233/241
Gross Valve Lift (Int/Exh): .504/.525
LSA/ICL: 110/106
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 2200-6400

I will be using Summit racings 1.5 aluminum roller rockers. I am building the motor to work out to a 10.17 CR 383 sbc for a fun little street/strip usage.

I am thinking the Lunati's springs will be a better choice due to the ramp rate of the lobe in this cam. Thanks for your help
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