What are some good valve springs that will hold up to a gm847 with 1.6 rockers?
Lift being in the mid 590's and duration 234/242 I do believe. Also is any machining/shimming required? If so please post up.

Thanks!!
Craig

 

Cam Card should give you required spring specs. Whoever provides that cam should provide recommended spring including ID and OD of the spring. There should be a spring available that will fit your stock seats and no machining will be necessary. Do some checking. JMHO

 

You might consider the Crane Dual Valve Spring PN 99893-16

OD: 1.460
ID 1.075
Seat Pressure: 130 lbs @ 1.850 install ht.
Open Pressure: 402 lbs @ 1.150 install ht.
Coil Bind 1.080

avg. spring rate: 391 lbs/in

I believe that the stock seat should fit (maybe snug, but should be ok)

 

Now that I think about it: I believe that is the same spring recommended for my little 210/224 cam and it apparently fits. It's basically for a big block or RV cam. Should work fine. Good luck.

 

402 # is way to high for an hydraulic roller cam.....

You need a spring that will be 120-130# seat/ 300-315 at max lift.

 

K-Motion K800's.

 

machinist, also note thats at .700" lift before you get too excited.

 

Alright I've decided those crane duals look pretty good. Fairly good price and they fit with stock seats. How about retainers/locks? Are the stock ones capable of being used or should I go with aftermarket retainers/locks? Thanks alot guys for the help.

Craig

 

Get the stuff that goes with the springs. JMHO

 

Consider getting the kit which contains the springs, retainers, keepers, shims. PN 10308-1

 

Thanks alot for the help I'm going to order that within the next week

 

LOL - I didn't notice that...but even so the spring rate would put the open pressure at 345# at .550