243 Cylinder head question
Thread Starter
Pro
Joined: Oct 2007
Posts: 538
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From: Niles Michigan
243 Cylinder head question
I have someone who wants to sell me some cylinder heads. They have the 243 casting number, but on the inside of the head, it is stamped 5.7. I am not sure if these are heads for an LS6 or for an LS2 motor. I also have a part number of 12564825. Can anyone help? Does anyone know the differences?
Last edited by Bludog; Dec 19, 2010 at 08:37 PM. Reason: mispell
Team Owner
Joined: Feb 2001
Posts: 27,265
Likes: 143
From: Short Hills, NJ
I have someone who wants to sell me some cylinder heads. They have the 243 casting number, but on the inside of the head, it is stamped 5.7. I am not sure if these are heads for an LS6 or for an LS2 motor. I also have a part number of 12564825. Can anyone help? Does anyone know the differences?
The heads he's selling might've started life as bare castings bought in the aftermarket (not necessarily off of a car originally) as well.
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Last edited by LS1LT1; Dec 19, 2010 at 08:55 PM.
Former Vendor
Joined: Jun 2006
Posts: 300
Likes: 0
From: Lubbock Texas
Some of the early 243 castings that were on the C5 Z06 had the sodium filled valves. The majority had standard valves. How much does the guy want for them and does he know how many miles are on them? I can tell you if it is a good deal or not.
Jon
Jon
Former Vendor
Joined: Feb 2004
Posts: 9,615
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From: Burlington NC
Jon I thought that most of the 02-04 C5Z had the sodium filled valves.
01 had the blue valve springs and had the standard valves
02-04 had the yellow springs and the light weight valves
05 and up had the silver springs and standard valves
All the above had 3.899 bore size, yes even the 4 inch bore engines
I can be corrected if needed!
Randy
01 had the blue valve springs and had the standard valves
02-04 had the yellow springs and the light weight valves
05 and up had the silver springs and standard valves
All the above had 3.899 bore size, yes even the 4 inch bore engines
I can be corrected if needed!
Randy
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Former Vendor
Joined: Feb 2004
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From: Burlington NC
Randy
