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Valve spring installed height? #2942098
07/11/21 05:30 PM
07/11/21 05:30 PM
Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
'
'72CudaRacer Offline OP
top fuel
'72CudaRacer  Offline OP
top fuel
'

Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
What's the "proper" formula for minimum valve spring installed height? If my memory is correct, it's coil bind + valve lift + .075" margin and minus lash? Or have I got it wrong?

Thanks, Brian

Re: Valve spring installed height? [Re: '72CudaRacer] #2942106
07/11/21 06:05 PM
07/11/21 06:05 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,007
Bend,OR USA
I use from .055 to .080 from coil bind at room temps, more (.080) on aluminum heads as they get taller when warmed up making the installed height get a little shorter, moving the spring seats closer to the retainers scope twocents
By the way, I check the pressures on every valve and set the installed heights based off of the coil bind clearances, not off the advertised installed heights tsk
Sometimes I need to change the inners or dampeners around to get the pressures closer together also upshruggy

Last edited by Cab_Burge; 07/11/21 06:07 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Valve spring installed height? [Re: Cab_Burge] #2942128
07/11/21 06:47 PM
07/11/21 06:47 PM
Joined: May 2019
Posts: 701
Lake Villa Il
INTMD8 Offline
super stock
INTMD8  Offline
super stock

Joined: May 2019
Posts: 701
Lake Villa Il
I put a spring/retainer/seat on a spring tester, bring it to coil bind add .060 plus valve lift (measured not theoretical) for minimum installed height.

So can often end up different intake/exhaust and isn't always necessary to run it that tight.


69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700






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