Vortec Head
Burning Brakes
Joined: Nov 2002
Posts: 952
Likes: 44
From: NC
I hear people say that they are 64cc but I believe they are actualy around 62-63. They have the smaller 1.94 valves but I heard they flow better than the old camel humps with the 202's. Im not sure about the casting numbers, I know there is a 906 and something like an 096? Im not sure of the difference....can anyone help out?
NCM Grand Opening Veteran
Joined: Sep 2005
Posts: 20,979
Likes: 384
From: South of giving a damn
St. Jude Donor '11, '17
25534371 Vortec Bow-Tie Large Port Cylinder Head, Bare
GM Performance Parts' latest and most powerful iron cylinder head with "large ports" for Street or Racing. This Vortec design Special Performance cast iron cylinder head features revised intake and exhaust ports and machined for 2.00" intake valve and 1.55" exhaust valves. The deck surface is .450" with 65 cc combustion chambers, 206 cc intake and 77 c exhaust ports.
Here' the GMPP head site:
http://www.gmgoodwrench.com/perfpart...373§ion=ep
GM Performance Parts' latest and most powerful iron cylinder head with "large ports" for Street or Racing. This Vortec design Special Performance cast iron cylinder head features revised intake and exhaust ports and machined for 2.00" intake valve and 1.55" exhaust valves. The deck surface is .450" with 65 cc combustion chambers, 206 cc intake and 77 c exhaust ports.
Here' the GMPP head site:
http://www.gmgoodwrench.com/perfpart...373§ion=ep
Racer
Joined: Dec 2003
Posts: 304
Likes: 0
From: Pasadena Maryland
The casting your looking for is 12558060. These are the 1.94/1.50 heads. I have them on my 78. Bolt on around 40HP right out of the box. Pace Performance sells a complete package for around $800 which includes the Edelbrock Intake. The heads themselves cost $289.95 apiece completely assembled.
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 751
Likes: 0
From: Lufkin Texas
Originally Posted by djgrelli
The casting your looking for is 12558060. These are the 1.94/1.50 heads. I have them on my 78. Bolt on around 40HP right out of the box. Pace Performance sells a complete package for around $800 which includes the Edelbrock Intake. The heads themselves cost $289.95 apiece completely assembled.
Melting Slicks
Joined: Jul 1999
Posts: 3,030
Likes: 17
From: White Pine / Dandridge TN
Don't rule out rebuilt heads from a local machine shop. I installed vortec heads about 5 yrs ago. I purchased them rebuilt from a machine shop for $400.00. They included upgraded z-28 springs, used self aligning rocker arms that were in very good shape and lightly used center bolt valve covers.
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