Vortec L31 cylinder head
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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. | + | [[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. | ||
| − | + | ||
==Aftermarket Vortec heads== | ==Aftermarket Vortec heads== | ||
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• Bosch HR9DC | • Bosch HR9DC | ||
| − | + | [[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] | ||
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