Valve Spring Help

[Tims 66 Cuda]

Ok Thanks

Tim

 

[PRH]

If you’re using the SM aluminum copy of the RPM head, there is no “inner step” to contend with, so a dual spring is a non-issue.
Make sure the retainers and locks in your kit will fit the valves.
If those parts are 7*, they should be for 3/8” stem valves....... not the 11/32” stem valves you’re using.
If the retainers are 10*, they can be used with the correct 11/32” 10* locks.

“What I would do”-
Check the installed height for every valve(check all 16 positions)using correct 10* retainer and locks.
If you can end up at around 1.820” installed height, while still having a shim installed between the spring and the head....... then I’d use a Comp 985, installed at 1.820 - 1.830.
135-140 closed/325-330@.500 lift.

 

[Tims 66 Cuda]

Will recheck in the morning Thanks for info.

Tim

 

[PRH]

With a dual spring, break cam in with inner springs removed.

 

[Tims 66 Cuda]

10-4 Comp stresses that several times

 

[oldkimmer]

I used the springs, retainers and locks for the Edelbrock heads. 5787 springs I believe. They are a perfect match. Kim

 

[Bewy]

Are you factoring in the 0.060" thick steel spring locators that stop the springs digging into the alum?

 

[Tims 66 Cuda]

I believe problem is solved. I took PRH,s lead and found 1.800 springs with same diameter and spring loads. Comp 987-16 and a .030 shim and I,m there. Thanks to all who chimed in. This is what makes this forum so good.

Thanks again, Tim