i dont see Ford PSD listed there.. i would like to know what the cost of the PSD springs are when you find out..

for guy's over 500 HP
WOP High Performance Valve Springs, will help elliminate valve float in high boost and high RPM situations. The kit includes Dual valve springs, steel retainers, valve seals, billet keepers It also Includes valve seal cutter, and 5/16th pilot. All you need to do is cut the valve guide seal with the tool provided using a hand drill. Dual Outside Diameter of Outer Spring (in): 1.440 in. Coil Bind Height (in): 1.110 in. Spring Rate (lbs/in): 340 lbs./in. Inside Diameter of Outer Spring (in): 1.085 in. Inside Diameter of Inner Spring (in): 0.795 in.

 

bump???????????????????????????

 

910's are about $100 and are only slightly better then the stockers you replace.

 

Then why are most ppl making big 500hp numbers running the 910's?

I compared specs on WOP's springs and comp cams and they are very similar.

Is there something I am missing here?

The only difference I notice is comp cams are "Single Valve Springs" while the WOP's are "Dual Valve Springs"

Is this what makes a difference?

 

I dont have the numbers in front of me but the 910's were only slightly better then the stockers...

I am running 910's and they seem to be holding 50+ psi fine, I also run stock pushrods and have yet to bend one.