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Undercut Valves

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Old Jul 9, 2008 | 08:31 AM
  #1  
whits87bird's Avatar
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Joined: May 2007
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From: Saskatoon, SK Canada
Car: 1987 Firebird
Engine: 305 LG4 lightly modified
Transmission: 700R4
Undercut Valves

I was just at the machine shop getting valves and springs priced out for my new heads. The guy there showed me the set of valves they will use and they were undercut and I was wondering why valves are undercut?
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Old Jul 9, 2008 | 09:16 AM
  #2  
Sonix's Avatar
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: Undercut Valves

slightly better flow at low lift.
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Old Jul 9, 2008 | 09:28 AM
  #3  
Apeiron's Avatar
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Joined: Jan 2000
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Undercut Valves

An undercut valve has less valvestem obstructing the flow through the port.
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