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Valve spring installed height ?? #1291441 08/26/12 12:57 AM 08/26/12 12:57 AM
Joined: Aug 2009 Posts: 2,042 Mooresburg, Tn ' '72CudaRacer OP top fuel
'72CudaRacer OP top fuel ' Joined: Aug 2009 Posts: 2,042 Mooresburg, Tn	How much leway is allowable to the valve spring installed height? My springs call for an installed height of 1.900". I have several that are less than that by .003"-.006", and most are above 1.900" by the same amount. Shims start at .015", so I'm guessing that inside that number will be an acceptable tolerance? I do have one that needs a .015" shim to bring it to +.006". Also, how close to coil bind can the springs be and still be safe? Thanks, Brian Dunnigan

Re: Valve spring installed height ?? [Re: '72CudaRacer] #1291442 08/26/12 02:47 AM 08/26/12 02:47 AM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	I was in the same boat needing 1.900 but was a bit shy and we made it work and I`m at about .060 from coil bind at a true .660 lift. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Valve spring installed height ?? [Re: Thumperdart] #1291443 08/26/12 05:10 AM 08/26/12 05:10 AM
Joined: Jul 2012 Posts: 429 Washington skrews mopar
skrews mopar Joined: Jul 2012 Posts: 429 Washington	I shoot for .010 + or -. Running the springs as close to coil bind with out coming to close will cancel out a lot of spring surge and harmonics.

Re: Valve spring installed height ?? [Re: '72CudaRacer] #1291444 08/26/12 02:22 PM 08/26/12 02:22 PM
Joined: Aug 2003 Posts: 43,159 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,159 Bend,OR USA	I don't go by installed heghts,, I have a spring tester and I set them up with shims as needed so I have .060 to .080 from coil bind at full lift You will need to check your lift at the retainers after that to insure you don't have a roque rocker that has more ratio than it takes to coil bind your springs I write down each installed hieght with the shims and check all the valve lifts at the retainers I usually end up with less lift at the retainer than the cam should open the valves, deflection and bending of parts does that I have had rockers that make more lift than advertised as well as less lift Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Valve spring installed height ?? [Re: Cab_Burge] #1291445 08/27/12 01:41 AM 08/27/12 01:41 AM
Joined: Jun 2007 Posts: 103 NEW JERSEY BIGSPEED member
BIGSPEED member Joined: Jun 2007 Posts: 103 NEW JERSEY	Quote: I don't go by installed heghts,, I have a spring tester and I set them up with shims as needed so I have .060 to .080 from coil bind at full lift You will need to check your lift at the retainers after that to insure you don't have a roque rocker that has more ratio than it takes to coil bind your springs I write down each installed hieght with the shims and check all the valve lifts at the retainers I usually end up with less lift at the retainer than the cam should open the valves, deflection and bending of parts does that I have had rockers that make more lift than advertised as well as less lift X2 Ceralli Racing Engines & Checkered Flag Machine Racing engines , CNC porting & induction development http://www.checkeredflagmachine.net/

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