I use the 918 beehive springs with my 1.6 rockers. They are rated for at least 0.600 lift.
I called Comp Cams and told them my engine specs and goals, they built a custom grind for me and sold me the entire spring kit, titanium retainers and all. Very pleased with the results.

 

LOL, good one. I was thinking that myself.
I believe the 915 and 918 springs are indentical in dimensions. One just has more pressure than the other. Double check the max lift though to be sure they can handle the cam liftwise, which I think comes out to .540

 

hey opening all your valves is over rated + i gota give the mustangs a chance well thanks for your help guys i guess im looking for some 918s i really kinda wanted to run a twin spring but what ever works. thanks guys

 

I've used these in the past with good luck.

http://www.summitracing.com/parts/CCA-987-16/

 

What is the max lift lift on those springs and can you use the stock retainers for those?

 

i dont think so, i cant find much that will work with my retainers and suport the 510 lift also what would that lift be with a 1.6 rocker?

 

Max lift is .600 and yes will work with stock retainers.....I think. Best to call. I've used these for years with a CC305 and 1.6rr.

 

Lift will be .544 with 1.6 rr.

 

well did some work wit the dial caliper and those springs wont work i have a .9 min inside dia and the out side dia on the retainer is 1.2. so i think im going to have to get new ones are these the stock ones?