Here is the specs on the Valve springs I have currently installed on my engine.

Part Number: 99893-16
Outer Diameter 1.460
Inner Diameter 1 1.075
Inner Diameter 2 0.803
Damper NO
Seat Pressure @ Installed Height 130 lbs @ 1.850
Open Pressure and Height 402 lbs @ 1.150
Coil Bind 1.080
Maximum Net Lift w/.060" Clearance 0.710
Average Spring Rate 391 lbs/in

I currently have the LT4 hotcam installed and want to install a CC306 later on and need to know if my springs are up for the task. I know **** about the valve springs so please bear with me.

Here are the specs on the valve springs suggested for use with the CC306.
CCA-986-16
Brand: Competition Cams
Product Line: Competition Cams Valve Springs
Number of Springs Per Valve: Dual
Outside Diameter of Outer Spring (in): 1.430
Coil Bind Height (in): 1.150
Damper Spring Included: No
Spring Rate (lbs/in): 296
Inside Diameter of Outer Spring (in): 1.070
Inside Diameter of Inner Spring (in): 0.697
Valve Spring Style: Standard
Coated: No

So will my springs work?

 

I could not find the info either.

 

TTT for ya bud.

 

that part # is crane cam double springs good too .600 lift

I am using them with my gm847

 

This link is the "kit" i have on my car right now, its for a lt-1 with alum heads, valve springs listed are the same as yours
http://www.cranecams.com/index.php?s...1&lvl=2&prt=34


this is the link for the valve spring, it is listed for a big block, but thats what they sell in there lt-1 kit...
http://www.cranecams.com/index.php?s...&lvl=3&prt=123

 

Thanks slowmofo and Metalbeast!

 

same springs here as well, with 847 here as well, only with 1.6 rr's, for a lift of .595" unless Slowmofo is using the same rocker ratio, are you?