Vortec L31 cylinder head

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(Design limitations and modifications)
m
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'''Pushrod guide holes'''
 
'''Pushrod guide holes'''
  
Vortec heads have a 7/16" round pushrod hole in the head, the earlier non self aligning rocker arm equipped heads have a 7/16" x 11/32" ovoid hole in them.
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[[File:Vortec head p-rod hole enlargement.jpg|left|thumb|Vortec head enlarging pushrod hole]]Vortec heads have a 7/16" round pushrod hole in the head, the earlier non self aligning rocker arm equipped heads have a 7/16" x 11/32" ovoid hole in them.
  
 
So what this means is three things-  
 
So what this means is three things-  
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• If non self aligning rockers ARE used, they '''''must''''' be accompanied by guide plates.
 
• If non self aligning rockers ARE used, they '''''must''''' be accompanied by guide plates.
[[File:Vortec head p-rod hole enlargement.jpg|left|thumb|Vortec head enlarging pushrod hole]]
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==Aftermarket Vortec heads==
 
==Aftermarket Vortec heads==
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• Bosch HR9DC
 
• Bosch HR9DC
  
 
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[[File:Vortec beehive.jpg| frame|Straight wound spring, Left; Beehive spring, right]]
 
==Links==
 
==Links==
 
Nasty Z28.com forum thread, [http://www.nastyz28.com/forum/showthread.php?t=56505 Vortec Cylinder Heads: The Definitive Guide]
 
Nasty Z28.com forum thread, [http://www.nastyz28.com/forum/showthread.php?t=56505 Vortec Cylinder Heads: The Definitive Guide]

Revision as of 23:32, 17 February 2012

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