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Re: Valve spring math [Re: Cab_Burge] #2896270
03/05/21 10:14 PM
03/05/21 10:14 PM
Joined: Nov 2013
Posts: 712
Southern Alberta
Uberpube Offline OP
super stock
Uberpube  Offline OP
super stock

Joined: Nov 2013
Posts: 712
Southern Alberta
Tested out at 140/375.

Re: Valve spring math [Re: Uberpube] #2896349
03/06/21 03:45 AM
03/06/21 03:45 AM
Joined: Aug 2003
Posts: 43,241
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
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Joined: Aug 2003
Posts: 43,241
Bend,OR USA
Are the lifters hydraulic or solid roller lifters?
If hydraulic roller lifters I would be tempted to add .015 shim to get a little more seat and over the nose pressures as long as you still have .060 clearance to coil bind on all 16 springs scope
if their solid roller lifters you need, I would run, a lot more pressure like 200 to 250 Lbs. on the seats and closer to 600 lbs. over the nose twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Valve spring math [Re: Cab_Burge] #2896432
03/06/21 12:13 PM
03/06/21 12:13 PM
Joined: Nov 2013
Posts: 712
Southern Alberta
Uberpube Offline OP
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Uberpube  Offline OP
super stock

Joined: Nov 2013
Posts: 712
Southern Alberta
It's a hydraulic, the morel lifter spec was:
Recommended Spring Pressure
100-180lbs Seat pressure
280-380lbs Open pressure
I am in pretty much middle of the seat pressure and almost max open pressure. At max lift I have .145 in coil space.
Do you think I need more seat pressure with this smaller cam and lower rpm limit?

Re: Valve spring math [Re: Uberpube] #2896501
03/06/21 04:28 PM
03/06/21 04:28 PM
Joined: Aug 2003
Posts: 43,241
Bend,OR USA
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Cab_Burge Offline
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Joined: Aug 2003
Posts: 43,241
Bend,OR USA
Run it as is and see how you like it twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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