fastsc92
Registered User
I've been running an average size cam for a little over a year now (.493 lift). When I swapped cams i was sure to degree it and I also had to machine a new keyway, ect ect. I installed the correct pushrods and everything has been fine, without even the slightest irritation. When I originally swapped, I just purchased new stock springs and was still running the stock stamped rockers. The stock springs may handle my .493 lift cam, but they just seem too weak for me. At high rpm's it feels like they float the valves. An upgrade is in the very very near future along with some RR's. So here are my questions:
I'm not exactly sure which springs to get. I've done some research and it seems that there are mixed opinions. Some people say to get the Comp. 942, and others say to go for the 986's. I'm looking for something that I can bolt in, and not have to machine the heads. I'm willing to shim if nessesary. I'd like to retain the stock spring cups and the stock retainers and locks if thats possible. I measured the stock OD on the springs and it comes in around 1.430". There are a few springs that will fit in that range. The 942's are a single spring, and the 985, 986, 987's are all double springs. I want something that can handle some lift, and I want something that isn't going to be weak at higher rpm's, and have the correct seat pressure, ect. Hopefully someone can give me some insight so I can make a choice. I'll try to list the specs below.
942 Single
OD- 1.437
ID- .974
Seat Load- 115@ 1.700
Open Load- 284@ 1.200
Coil Bind- 1.125
Rate (lb/in)- 339
985 Double
OD- 1.400
ID- .700
Seat Load- 164@ 1.750
Open Load- 331@ 1.250
Coil Bind- 1.150
Rate (lb/in)- 333
986 Double
OD- 1.400
ID- .697
Seat Load- 132@ 1.750
Open Load- 280@ 1.250
Coil Bind- 1.150
Rate (lb/in)- 296
987 Double
OD- 1.400
ID- .697
Seat Load- 121@ 1.800
Open Load- 388@ 1.200
Coil Bind- 1.150
Rate (lb/in)- 344
I'm not exactly sure which springs to get. I've done some research and it seems that there are mixed opinions. Some people say to get the Comp. 942, and others say to go for the 986's. I'm looking for something that I can bolt in, and not have to machine the heads. I'm willing to shim if nessesary. I'd like to retain the stock spring cups and the stock retainers and locks if thats possible. I measured the stock OD on the springs and it comes in around 1.430". There are a few springs that will fit in that range. The 942's are a single spring, and the 985, 986, 987's are all double springs. I want something that can handle some lift, and I want something that isn't going to be weak at higher rpm's, and have the correct seat pressure, ect. Hopefully someone can give me some insight so I can make a choice. I'll try to list the specs below.
942 Single
OD- 1.437
ID- .974
Seat Load- 115@ 1.700
Open Load- 284@ 1.200
Coil Bind- 1.125
Rate (lb/in)- 339
985 Double
OD- 1.400
ID- .700
Seat Load- 164@ 1.750
Open Load- 331@ 1.250
Coil Bind- 1.150
Rate (lb/in)- 333
986 Double
OD- 1.400
ID- .697
Seat Load- 132@ 1.750
Open Load- 280@ 1.250
Coil Bind- 1.150
Rate (lb/in)- 296
987 Double
OD- 1.400
ID- .697
Seat Load- 121@ 1.800
Open Load- 388@ 1.200
Coil Bind- 1.150
Rate (lb/in)- 344