ive read some posts on the 918s some say .600 lift and others say .625 lift

how would they handle a .610 lift?

 

I'd check for coil bind,you are going to be close.They will probably be ok but a broken valve spring can be a real drag.

 

thats too much IMO

 

I thought they were maxed out at .600 lift. .610 is really pushing it.

 

Yup. 918's are good to .600

 

you'll be fine up to 625 lift

 

Beehive Shape Ovate Wire Springs
The 26915 and 26918 Valve Springs are specifically designed for the LS1 Chevrolet cylinder head and
can be used as stock replacements or in performance applications all the way up to 0.625” lift and at engine speeds to 7500 RPM. Engineered to fit stock heads with no machining, utilizing the stock valve seat and spring retainer. This valve spring can also be used in all applications with the specifications list-ed.

Installed Load: 105 lbs @ 1.800" 130 lbs @ 1.800"
Open Load: 293 lbs @ 1.200" 318 lbs @ 1.200"
Spring Rate: 313 lbs/in 313 lbs/in
Coil Bind Height: 1.085" 1.085"
Outside Diameter: 1.290"/1.060” 1.290"/1.060”
Inside Diameter: .885"/.656” .885"/.656”
Retainer: TI 772/Steel 774 TI 772/Steel 774
Part # 26915-16 26918-16
Description GM LS1 Spring High Load Spring

Maybe so!

 

Damn, that's news to me. I guess they pretty good spings huh.

 

just to be safe, personally i would go with a dual spring.

 

921 or the Patriot gold....forget about the 918's.