Comp 988 dual valve springs = lifter noise???


squealingtires

15+ Year Member

Joined
Nov 6, 2007
Messages
56
Points
3,101
Age
43
Vehicle Year
1993
Transmission
Manual
Has anybody running the Comp 988 dual valve springs notice any extra lifter noise? I'm noticing enough noise to be annoyed. I'm running the Comp 410 cam and I understand the dual springs were not required but were recommended for my 4.0L OHV aplication. The additional seat pressure has me concerned that the lifters (Brand new Hylift-Johnson) won't be able to keep up. I'll give them a few miles to work any air out before I do anything but was interested in anybody elses experience.

What are your thoughts?
 
Here is some more infor that I dug up

Sealed Power VS1630 (I think these are factory replacements - can anyone verify factory spring specs)
Closed force @ 1.5" = 98lbs
Open force @ 1.15" = 177lbs
This equates to 225lbs/inch

Comp 988 dual valve springs
Closed force @ 1.6" = 117lbs
Open force @ 1.1" = 232lbs
This equates to 230lbs/inch

So basically there is little difference with respect to what the lifters would have to overcome between the factory springs and the Comp 988 springs.
 
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